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Gonna Try Building a 1kW Class D Amp for Only $396
#334713 01/17/11 11:58 PM
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Just put the order in for some parts to try building my own Class D Two Channel Amplifier. Saw this thread and it really intrigued me:

http://www.audiocircle.com/index.php?topic=76400.0

(For anyone even remotely interested in DIY type stuff, it's a fascinating thread)

After contacting the owner of the company who makes the amp boards(Tom, who seems like a really nice guy), I ordered a large toroidal transformer (1000VA), heavy duty power supply, and two amplifier modules which should output 500W each easily when bridged. Since they are Class D, they are much more efficient (>90% vs 50-60% for class A/B) and should put out much less heat. THD numbers look really good too. I should be getting the parts by this weekend and will do a quick assembly first to test things out and see how it sounds. I'll let you guys know how it goes.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334714 01/18/11 12:03 AM
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Steve, did you check out the Sure Electronic DIY amp boards at Parts Express by any chance? not sure if it's comparable at all to what you're looking at.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Adrian #334719 01/18/11 12:16 AM
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Yep, they're in my bookmarks (as well as some others). Sure Electronics output power was much lower, and the THD+N at rated power was REALLY high (10%). THD+N at rated power for the modules I bought is <1%.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334723 01/18/11 12:29 AM
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do they furnish the instructions? Also, what about the case? Can you provide links?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #334727 01/18/11 01:00 AM
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I'll be VERY interested to find out how this goes!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #334728 01/18/11 01:10 AM
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They supply individual parts and kits. Instructions are supplied too (also on their website):

http://classdaudio.com/index.php/

You're basically on your own for the case, but just about any enclosure would work. For now, I'm just going to assemble it on a block of wood. If it sounds great (like most have said), I'll probably build a nice wood enclosure.

Tom also buys in bulk and will pass the savings on to you. The 1000VA toroidal transformer would go for $100 alone unshipped if I tried to buy it myself (sucker weighs in at 18 lbs alone).

Read through the thread link I posted above if you get a chance. There are some wonderful examples of systems put together, as well as some nice DIY cases. I'm pretty excited about this...


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334738 01/18/11 03:05 AM
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Please update us with a photo or two of your build and your thoughts after completing it and taking for a test drive.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
terzaghi #334747 01/18/11 05:25 AM
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Looks good, Steve! I'm excited for you. Let us know how the build goes!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
St_PatGuy #334749 01/18/11 06:10 AM
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Very cool. I may have to look into this when I need more channels. Good luck!

Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334750 01/18/11 06:51 AM
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That Class D Audio kit gets my thumbs up too.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #334782 01/18/11 02:45 PM
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Make sure to post your progress on the build, Steve.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #334786 01/18/11 03:01 PM
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Gets your thumbs up… where? shocked


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Adrian #334797 01/18/11 04:12 PM
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Originally Posted By: Adrian
Make sure to post your progress on the build, Steve.


Will do. It's shipping today so I should have the parts by Friday. The first assembly will be quick and dirty just to get it going and test it out (it will be ugly to look at). It should not take more than a couple of hours to do this, so I should have my initial impressions this weekend (I wish I had a THD analyzer!). I think I may wind up buying a clamp on ammeter to measure amp current draw and use my sound meter to measure db output. I know this amp will use less power to get the same db output, but I would love to take some measurements against my AVR-3806. I do have an infrared thermometer, so I'll shoot the heatsink to see how hot it gets (open air).

The final assembly (time and money involved) will depend on how good it sounds wink


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334798 01/18/11 04:39 PM
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Geektastic.

I'm interested in this. But I'm not really very good at soldering. Many posts in the linked thread go far beyond my current or desired level of electrical theory.

Pictures would be cool.

Thanks, Steve!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #334812 01/18/11 06:58 PM
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I've only done 2 builds. Back when I was an early teen. I bought 2 of those light kits that made lights flash in time with the music. The instructions were a little fuzzy concerning the orientation of the rectifier. I put it in the way it looked good to me, but when I first went to turn it on, it blew up in a pile of smoke. The second one, I turned it around and it worked just fine.

Re: Gonna Try Building a 1kW Class D Amp for Only $396
CatBrat #334821 01/18/11 08:32 PM
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One of the pluses the lured me to this system was that you really do not need to solder anything for the initial quick and dirty hookup. All of the connections between the boards are done with screw terminals. Soldering is an option of couse down the road for external run and trip leds, power switches, and binding posts.

The other thing that lured me was all of the positive comments, and the quality of the parts involved. The Heavy Duty Power Supply uses Nichicon 100V, 105C, 4700uF capacitors (very good quality Japanese capacitors). I priced them out online and the best price I could find was about $14 a pop when buying less than 50 of them at a time... The power supply board has 6 of them, and he sells the whole board for $65 before an additional discount if you buy a kit.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #334837 01/18/11 11:13 PM
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Wait, can you use them bridged with your M80s? I didn't think you could bridge amps when you were dealing with a 4 ohm load.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #334839 01/18/11 11:23 PM
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These amps are rated down to 2 ohm individually, and will work bridged with a 4 ohm load. I also confirmed this with Tom before I bought them.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334840 01/18/11 11:25 PM
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Sweet. Which model of amp is it?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #334841 01/18/11 11:43 PM
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CDA-254. The 4 suffix designates 4 ohm stable. Although he only publishes it as 500W 8 ohm bridged, he does confirm it will also drive 4 ohm when bridged. Power will be slightly more, but not double. It will start clipping (>1% distotion) long before 1000W.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334842 01/18/11 11:48 PM
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Oh neat, I didn't realize he included standoffs and mounting screws.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #334846 01/19/11 12:18 AM
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It is quite the kit, he may have a bunch of sales on his hands if this build works as well as advertised smile


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #334847 01/19/11 12:20 AM
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It would be really cool if he offered a pre-drilled chassis and parts for the pretties.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334851 01/19/11 12:33 AM
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I think I might love this company. I was looking at the user manual, and noticed a VERY interesting rendition of the flag printed on the amp board...



So, Steve, a couple questions, if I may.

1. What's the functional difference between buying two of the CDA-245S kits and one of the CDA-2000 kits? They seem to be the same amp boards. Do you expect more power by using two (smaller?) power supplies and two (smaller?) toroids?

2. If you're using two of the CDA-245 in bridged mode, you're basically building two monobocks, right? I know it's a minor detail, but I don't see how you wire the external LED's in bridged mode.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #334852 01/19/11 12:35 AM
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Seems like Steve bought a custom version of the CDA-2000 kit--with the large PS, the 2 CDA-254 boards, and a 1kVA transformer (larger than anything in a kit that I see).

Last edited by kcarlile; 01/19/11 12:36 AM.

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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #334854 01/19/11 12:41 AM
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Originally Posted By: kcarlile
Seems like Steve bought a custom version of the CDA-2000 kit--with the large PS, the 2 CDA-254 boards, and a 1kVA transformer (larger than anything in a kit that I see).


I think that sums it up.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #334855 01/19/11 12:47 AM
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Originally Posted By: tomtuttle
So, Steve, a couple questions, if I may.

1. What's the functional difference between buying two of the CDA-245S kits and one of the CDA-2000 kits? They seem to be the same amp boards. Do you expect more power by using two (smaller?) power supplies and two (smaller?) toroids?

2. If you're using two of the CDA-245 in bridged mode, you're basically building two monobocks, right? I know it's a minor detail, but I don't see how you wire the external LED's in bridged mode.


1) The 254S kit has a low profile power supply (smaller caps). I went with the heavy duty power supply. The power supply board will power both amps, and each amp will be bridged. The CDA-254 amp board actually has 2 amps on it, and I'm ordering 2 CDA-254 amps, and will bridge each one.

2) Yes. 2 monoblocks in 1 case with a shared 1000VA toroid. As far as the led's go, I think you just wire the left channel since that is the channel you will use when bridged. Not sure though.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334856 01/19/11 12:51 AM
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Easy enough to find out on number 2, just look at which LEDs on the board light up, right?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #334857 01/19/11 12:57 AM
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Ah ha! I was apparently not reading carefully enough. Thank you very much for the clarification, Steve.

How come the CDA instead of the SDA or TI amps?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #334864 01/19/11 01:31 AM
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The SDS was about $100 an amp more for things I did not need (balanced inputs, input level adjustment, etc.) The TI amps have greater distortion (their full power rating is actually at 10% distortion, vs. <1%), and were not as well received by the group. In reality, a lot of people preferred the sound of the SDS amp compared to the CDA amp, but most said it was not a difference that was worth the prices. Some people said it had "a deeper soundstage" and "presence". I tend to ignore comments by people who make those statements about amps.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #334867 01/19/11 01:43 AM
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The other thing that's kind of cool about the amp modules is the ease in switching form bridged to stereo mode. If it turns out that the M80 impedance is too low (it does seem to dip to 3 ohm) and the amp starts to overheat or cut out, I can always unbridge the amps by just changing a jumper and wiring the output from +V/+V on each amp, to +V/-V on each channel of the amp. I'd still have tons of power at 250W per channel, and now have 4 channels so I can also power the VP180 with it (and have 1 channel left over). It's a fallback position just in case.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #334871 01/19/11 02:03 AM
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Originally Posted By: tomtuttle
I think I might love this company. I was looking at the user manual, and noticed a VERY interesting rendition of the flag printed on the amp board...




HA! Now that's a random place to have such a sticker.

Good luck with everything Steve, this is really cool!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ya_basta #334930 01/19/11 05:53 PM
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That amp is certainly impressive. I've always wanted to do a DIY tube amp or DAC. However, this should be a perfect pairing for the M80's, you'll really be able to rock the house!

As always, remember that we love pictures smile



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Re: Gonna Try Building a 1kW Class D Amp for Only $396
danmagicman7 #334931 01/19/11 05:55 PM
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how much soldering, etc. is involved, or is it just plug it all togethor?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #334932 01/19/11 05:55 PM
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From what I can tell, if you want to make it pretty, you have to solder. If you just want to try it out, you can just screw the wires into the posts.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #334936 01/19/11 06:17 PM
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Originally Posted By: sirquack
how much soldering, etc. is involved, or is it just plug it all togethor?


Exactly what I was wondering. My guess is you do ALL the build/soldering although the website infers that most of it's pre-built. What's the scoop, Steve?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Adrian #334941 01/19/11 06:29 PM
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Originally Posted By: Adrian
Originally Posted By: sirquack
how much soldering, etc. is involved, or is it just plug it all togethor?


Exactly what I was wondering. My guess is you do ALL the build/soldering although the website infers that most of it's pre-built. What's the scoop, Steve?


Apparently you just wire it together. Source

Since this amp seems very simple to put together, if you really wanted to go DIY you could do component upgrades. Most of the time they are transformer or capacitor upgrades. Some believe that component upgrades can push "cheap" equipment with good circuitry designs into something that's great. Tried looking up mods for this amp, couldn't find much.





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Re: Gonna Try Building a 1kW Class D Amp for Only $396
danmagicman7 #334942 01/19/11 06:32 PM
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Class D amps don't take to tinkering with their designs too well. You really need to know what you're doing before you substitute any component. Else you end up building yourself a 1000 Watt AM radio station.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #335076 01/20/11 11:37 PM
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Sorry guys, I was out of town on business... Just got back and the box from ClassD was waiting for me! Quick shipping indeed! The toroidal transformer is coming directly from the manufacturer, so I hope it comes soon. I'll start mounting and wiring what I have so far tonight. Here's a couple of pix:

PS - The ruler is there for TomTuttle... Sense of scale.







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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335077 01/20/11 11:41 PM
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NICE, So.....is it done yet? wink


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
danmagicman7 #335078 01/20/11 11:43 PM
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Originally Posted By: danmagicman7
Since this amp seems very simple to put together, if you really wanted to go DIY you could do component upgrades. Most of the time they are transformer or capacitor upgrades. Some believe that component upgrades can push "cheap" equipment with good circuitry designs into something that's great. Tried looking up mods for this amp, couldn't find much.


Chris is right, you have to be careful with Class D type amps. Tom will upgrade the boards to whatever caps you want. You can either have him buy them, or mail the caps, etc. to him. He'll do the soldering for you. I asked Tom about an upgrade of the power supply caps from 4700uF caps to 10000uF caps. He said each one would cost about $15 more because he does not buy them in bulk. He said he would not recommend spending money on that though because it was just not worth it (I would not really hear any difference). I trusted his opinion and went with the stock caps. He did say that the toroid upgrade was a wise choice for multiple amps.

I can tell you from looking at what is on the board, these are high quality components.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
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Took about 2 hours, and it isn't the prettiest thing now, but I have it all wired now except for the toroid. Hoping it will come tomorrow of Saturday. I used 12 gauge wire to connect the power supply to the amps, and it was a tight fit (it's where I spent most of the time). I'll probably go with 14 gauge in the permanant installation.




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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335098 01/21/11 03:12 AM
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Very cool Steve! I have always wondered about DIY amps.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
fredk #335099 01/21/11 03:18 AM
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Kewwl! thanks for posting pictures, Steve. It looks like something I might want to try as well.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Adrian #335101 01/21/11 03:49 AM
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This isn't looking too bad. I was originally thinking you had to solder all of the pieces onto the boards. I may have to give something like this a try.

Re: Gonna Try Building a 1kW Class D Amp for Only $396
CatBrat #335103 01/21/11 03:53 AM
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yeah, if I'm not mistaken they are in some type of screw or tensioned socket? Just when you get this thing all juiced up and the capacitors are full, don't touch anyting. smile


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335104 01/21/11 03:56 AM
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Nice! Where'd you get the RCA connectors?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335105 01/21/11 03:58 AM
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Yes, the caps are my main worry Randy. I'll probably have to let it sit for a long while unplugged to let the caps discharge before I'm ready to take it apart for the final build.

The sockets are all screw down. Real easy.

Once the toroid arrives, my plan is to test it out first using my iPhone as the input, and my old VP150 as the sacrifical lamb before I even think about hooking it into my system. I'll test one channel at a time with the 6 ohm load of the VP150 and make sure everything looks good. If it all checks out, I'll hook it into my main system and have it drive both M80s using the AVR-3806 pre-outs.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335106 01/21/11 03:59 AM
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Originally Posted By: kcarlile
Nice! Where'd you get the RCA connectors?


I just cut apart an old cable I had lying around for now. I'll buy RCA connectors with solder tabs when I'm ready for the permanent installation.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335107 01/21/11 04:04 AM
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That's what I figured, but I was thinking the wires inside must have been TEENY.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335108 01/21/11 04:14 AM
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The + wire certainly was.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335110 01/21/11 04:36 AM
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Also, for the people who are interested, I noticed that the amp boards that I received did not have the Maron 560uF caps as shown on the picture on the ClassD site. A lot of people on the audiocircle board had commented on the lower quality of these caps in respect to the rest of the amp. Tom must have listened because they are now Panasonic 680uF caps. So again, I see a lot of high quality parts on these boards.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335111 01/21/11 04:37 AM
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I just read through the manually and see how they are setup if you want to build external off/on switch as well as extending the leds. A little soldering possibly, but nothing to crazy. Man if this works out Steve and your happy with the performance and sound of D technology, I may have to consider this some day. Thanks for bringing this to our attention. Sure beats the heck out of the cost of other mfg'd amps with the same power. Are you going to build a mono version for the VP180 if all works out?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335112 01/21/11 04:45 AM
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I'm hoping it sounds at least as good (but with more power) as the amp stage on the AVR-3806. I know, high hopes... But, if it works out that way I was considering a mono version for the VP180 in the short term, and in the long term buying exaclty what I bought again but wiring it unbridged to power the four surrond/rear channels. At that point, I would sell my AVR-3806 and buy a preamp/processor instead (something similar to the Emotiva UMC-1).


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335114 01/21/11 05:20 AM
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What, I'm the only one who needs scale? grin

Great, Steve. I appreciate the pictures and writeup.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #335120 01/21/11 07:24 AM
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Looking very good. As I mentioned if this works out, there will be a number of sales from this build. Now just to decide on a chassis to put this into. Anyone found anything online. I could build a wood enclosure like others have done but I would like the manufactured look(steel/plastic/aluminum) to match the rest of the system


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #335127 01/21/11 11:38 AM
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A guy named Jason (jtwrace) on the audiocircle board makes a case for this with everything pre-drilled and labeled. His gallery is here:

http://www.audiocircle.com/index.php?action=gallery;sa=album;id=4288

I have not contacted him yet, so I don't know the cost or if they are still available. I'm not sure if I'm going to build a case myself or go with something like that. You can however find some places online that have plain old aluminum or steel cases if you choose to drill yourself:

http://www.par-metal.com/

I'm hoping that the amp sounds great and he does get a lot of business becuase he seems like a nice guy who makes a nice product (I always like to see good quality parts being used). I know on the audiocircle site he gave that group a 5% discount. So, if after I put it together and it sounds good, I'll let him know about this board and see if he wants to offer a board discount to us.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #335129 01/21/11 12:51 PM
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Originally Posted By: jakewash
Looking very good. As I mentioned if this works out, there will be a number of sales from this build. Now just to decide on a chassis to put this into. Anyone found anything online. I could build a wood enclosure like others have done but I would like the manufactured look(steel/plastic/aluminum) to match the rest of the system


Here are a couple of sites for enclosures-- Hammond, and Mouser and Lansing.

Also, here's a place that can custom cut and punch a front panel.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
St_PatGuy #335130 01/21/11 12:55 PM
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This site looks interesting. You can fully design your own case and they can build it for you. I have no idea of the cost, but it looks pretty neat for those that don't have the means/knowledge for making his or her own.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
St_PatGuy #335131 01/21/11 12:56 PM
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Steve, that kit looks very cool. I'm eagerly awaiting your impressions. I like the fact that all the dirty work is kinda done already. I am certainly a novice when it comes to soldering and this seems like a good first project.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
St_PatGuy #335136 01/21/11 02:27 PM
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Steve which model did you get the 2000 kit?, man they have lots of kits and different model numbers, kinda confusing. I thought when bridged you could only drive 1 channel, or is that for each board you have?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335168 01/21/11 04:55 PM
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See my post a few sections back. He essentially bought a modified 2000 kit.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335176 01/21/11 05:39 PM
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Got a little antsy, so I dragged out my variable AC power supply and dialed it into about 50V AC to test the amps. I will say this... IT GETS LOUD! The sound seems about the same as the AVR-3806, but its hard to say because I'm just running one VP150 at a time. I hit 104db (@ 1m) constant output with the iPhone turned all the way up, and was pulling about 50W. Amp IC temp hovered around 56C (that's the actual chip, not the heatsink which was only warm to the touch). But just as I was typing this mail, the toroid arrived! Will be away for a bit doing some rewiring, but looking real good so far. Pix attached:

Test setup:


Temperature:


Toroid!





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Re: Gonna Try Building a 1kW Class D Amp for Only $396
St_PatGuy #335182 01/21/11 06:26 PM
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Thanks for those links everyone, the Protocase supplier looks like a winner if it isn't too expensive.

That torroid looks pretty tall 6-8", that would allow for alot of room for air circulation around the system.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #335196 01/21/11 07:18 PM
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The toroid is 6.2" diameter, and 3.5" tall.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335200 01/21/11 07:29 PM
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Wow!, only 3.5 tall those pics do nothing for sense of scale. That makes it really nice for a lower profile cabinet, this just keeps getting better and better smile


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #335220 01/21/11 09:21 PM
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Well, toroid all hooked up (was a bear, it has 2 primaries and 4 secondaries) and tested on the VP150. Everything working great! Going to put it to the real test now... A pair of 4ohm M80s.






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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335223 01/21/11 09:44 PM
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That's almost too easy.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #335225 01/21/11 09:49 PM
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Almost? If the dude sold predrilled cabs, it would be a no brainer.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335230 01/21/11 10:20 PM
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The M80s acutally got the amp heatsinks hot in bridged mode! I could sustain 102 db, both speakers, from 12 feet away no problem. The amp started going into protect mode (high heatsink temp over 100C) at about 105db sustained (my ears are ringing right now). What the amp does is turn off the affected channel until it cools and turns it back on again. I'm going to do a quick rewire to unbridge the amps to see how far I can push them. Some people had this problem and added to the heatsink and put a fan on it.

The sound is INCREDIBLE! It really does sound punchier than the AVR-3806. Very clear and tight. The wife said it was not even close (she liked it better than the AVR-3806), but it was a bit more close for me. Definitely punchier and tighter sound. If it sounds just as good unbridged with a higher output headroom before overtemp, I may leave it that way and hook the VP180 up now.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335231 01/21/11 10:22 PM
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Originally Posted By: kcarlile
Almost? If the dude sold predrilled cabs, it would be a no brainer.


This dude does!

http://www.audiocircle.com/index.php?action=gallery;sa=album;id=4288


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335232 01/21/11 10:23 PM
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Does he still?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335237 01/21/11 11:18 PM
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I like this thread!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335250 01/22/11 01:18 AM
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Okay, I've tested the system out and listened for several hours. I also hooked up the VP180 once I unbridged the amps. Here are my opinions.

Sound Quality - At least as good as the AVR-3806, and I think a good bit better. My wife thinks it's much, much better. Sound seems tighter and less muffled. I don't know if it's a characteristic of the Class D type amplification, having separate amplification, or a little of both. We switched back and forth between the AVR-3806 and the ClassD amp several times, and every time it felt like cotton came out of our ears.

Power - Here's the rub. I cannot test the unit to full power, even in unbridged mode, because the amps will cut due to high temperature. The best I was able to sustain without any cutouts was a constant 102db in my listening position. When I looked at the wattmeter, I was pulling about 90W. That's with 3 channels going too. Interestingly, the VP180 always cuts before the M80s. Maybe something changed with the new crossovers and drivers. The website (and the people on the board) have said that higher power demands require an active cooling system. When I shot the heatsink, it was at 73C constant. So, I think adding fins on the heatsink and the addition of a fan would allow me to bump the power up.

Fun Factor and Ease of Build - It's REALLY easy to build and a lot of fun. I'm really proud of it even in it's unfinished state. Knowing I can go in and tweak things (like thinking of a way to provide a more robust cooling solution) is a lot of fun for me.

Recommendation - I would recommend these kits for people who normally listen to music below 100db. If you listen in the 85-90db range, there is no problem whatsoever, and you can go with a much smaller toroid and amp size (driving the cost down even more). The sound quality, at least to our ears, easily rivals or beats that of high end professional equipment. I would also recommend this kit for someone looking to amplify surround speakers on the cheap, or someone who likes to tinker around (especially coming up with a nice cooling solution).

I'm going to keep the amp hooked into my system. I like the change in sound that much. Plus, I usually listen in the 90-95db range, so I'm good with the volume. I just want to be able to figure out a good way to get the most I can out of the amp modules... But hey, that's part of the fun right?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335251 01/22/11 01:39 AM
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Good for a Denon 9.2 that has pre-outs for 11.2 (or 9.3 to 11.3)

Re: Gonna Try Building a 1kW Class D Amp for Only $396
CatBrat #335253 01/22/11 02:15 AM
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It's hard to judge from the pics. Is the heat sink taller than everything on the board? Can't tell if it clears the inductors or not.

I was thinking you could get a finely finned heat sink and use a thermally conductive epoxy to attach it to the existing sink. Something like: http://www.arcticsilver.com/arctic_silver_thermal_adhesive.htm


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #335256 01/22/11 02:43 AM
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Funny you say that Chris. I'm going to Fry's tomorrow to pick these up:

http://www.frys.com/product/5591560?site=sr:SEARCH:MAIN_RSLT_PG

Turns out the are the exact width of the heatskink, and a set of 8 will cover the entire top. They are self adhering as well.

I also just ordered two 48VDC fans for $1.75 each. The output of the DC power supply is 50VDC.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335274 01/22/11 04:21 AM
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Keep us posted Steve. Curious, if you plan to call the seller and discuss the shutting down issue, if they claim 4ohm compatible, and shutting down when it is not within a case, plenty of ventilation?

My Odyssey mono's I had got fairly hot to the touch and were a A A/B design, which is not as efficient as Class D. I'm just trying grasp the concept of having all that power if you can only listen to levels the Denon will easily put out. I know the sound appears to be better/tighter overall, but as John always says, why have all that extra umph if you don't use it. smile

I suppose for the small price you payed, it still was a good venture.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335276 01/22/11 04:25 AM
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Well, given that he was bridging and pushing >105dB on 4 ohm speakers, I'm not surprised it shut down with those teeeeeny heatsinks.

So, so tempted to try this out. Don't need it... don't need it...


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335280 01/22/11 04:29 AM
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Keep telling yourself that Ken, let me know how it goes. wink


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #335281 01/22/11 04:36 AM
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I have fabulous resistance to buying toys, mainly because I can never decide which toy to buy, and oh, it might go on sale, but now it's on sale, maybe I should, maybe I shouldn't, oh look, it's not on sale again...


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #335283 01/22/11 04:39 AM
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But he said above even in unbridged mode it would still cut out because of overheating. I guess I'm just confused on if Class D is supposed to be 85-90+ efficient over A or A/B designs which are in the 50% or less range, no case for trapping the heat, and 4 ohm compatible, why the issues?

If there is a good sound improvement, for the price it still is a great dealeo.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335284 01/22/11 04:40 AM
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Oh, I missed that bit.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SirQuack #335290 01/22/11 05:18 AM
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Originally Posted By: sirquack
But he said above even in unbridged mode it would still cut out because of overheating. I guess I'm just confused on if Class D is supposed to be 85-90+ efficient over A or A/B designs which are in the 50% or less range, no case for trapping the heat, and 4 ohm compatible, why the issues?


Are the heatsinks those little strips of silver metal in the pictures, or were the real heatsinks removed for the pics ?

A class AB (typical amp) with that power rating would have heatsinks the size of your head (ie a lot more than 10x the size of the heatsinks in the pics) wouldn't it ?

Last edited by bridgman; 01/22/11 05:19 AM.

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Re: Gonna Try Building a 1kW Class D Amp for Only $396
bridgman #335291 01/22/11 05:30 AM
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Yup, the little strips are the heatsinks.

Yeah, I'd say at least the size of your head, if not two heads.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335292 01/22/11 05:55 AM
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Looks like the design's been changed a bit on the shipping amps--I see in his pictures that it has RCA jacks (maybe?) on the boards, but yours has screw terminals in those locations.

How'd you wire up the plug to the outlet? That would probably be the thing that would make me the most nervous.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335295 01/22/11 06:44 AM
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I am guessing moving up to the SDS line might be worth it as this series has a finned heatsink.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #335296 01/22/11 06:45 AM
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Yeah, I was kind of going back and forth on that--like Steve said, don't really need the balanced inputs or the gain knobs, but the heatsink sure would be nice. Not sure if it's $100 premium nice, though.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335299 01/22/11 12:12 PM
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The heatsinks on all 3 amp boards (CDA, SDS, TI) are all extremely tiny, so I don't think even the SDS amp would have enough heatsink to drive them constantly at these volume levels without forced cooling. The CDA heatsinks measure 1/2" x 1" x 4.25" (a little over 2 cubic inches, the size of two kit-kat bars on top of each other). Looking at the heatsink in my AVR-3806, I'd say it has at least 50x the mass of the heatsink on these boards. The 4-channel amp I built totally assemlbed weighs about 25 lbs, 18 lbs of which is the toroid and 2 lbs for the mounting board. Most of the weight in my AVR-3806 appears to be heatsink (the tranformer is non-toroidal and much smaller).

I have absolutely no regrets on this purchase even with the reduced power output. 100db per channel of quality amplification with no external cooling is nothing to sneeze at, especially at this price and considering how small they are. It will be interesting to see what happens with the addition of more heatink and the addition of a fan or two.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335300 01/22/11 12:34 PM
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Originally Posted By: kcarlile
Looks like the design's been changed a bit on the shipping amps--I see in his pictures that it has RCA jacks (maybe?) on the boards, but yours has screw terminals in those locations.


Yes, these came with screw terminals. He can build them with onboard RCA jacks instead, but most people do not want this since they will be putting the amps in an enclosure.

Originally Posted By: kcarlile
How'd you wire up the plug to the outlet? That would probably be the thing that would make me the most nervous.


I paralleled the primary of the toroid just as Tom said in the instructions. I used an old power cord I had lying around and cut off the female end. I wired the hot AC line through a 10A slo-blow fuse, to the line side of the primnary, and wired the neutral line to the neutral side of the transformer. Ground cord unused for now, but I would tie that to the chassis. (Warning - BIG pictures below)



On the secondary side, I had no directions for a 4-secondary transformer. So I wired secondaries 1 and 2 like his directions, and secondaries 3 and 4 like his directions. Since I wanted the voltage to remain constant, but with double the current, I connected these two discrete secondaries in parallel to the heavy duty power supply board. Worked great! (I put the electrical tape on the secondaries by the toroid for me to easily identify the wire pairs of the 4 secondaries, they are not really covering anything):




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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335307 01/22/11 01:54 PM
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As a test, I directed my HEPA filter fan at the stock heatsinks. I was able to turn the receiver up to +7db with no cut outs and the amps stayed at about 78F. I was only able to hit about -3db on the receiver before. This volume was painfully loud, so I had to take pictures quickly and get out of the room. So, it's definitely something that can be fixed with better cooling.





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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335319 01/22/11 04:07 PM
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That's quite a difference. Good to hear, Steve.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Adrian #335346 01/22/11 06:38 PM
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Only here (and a few other sites) would someone understand the need* to improve an amplifier so that it can play comfortably and reliably at a level which forces you to leave the room wink

* I originally said "desire" but "need" is probably more accurate


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
bridgman #335355 01/22/11 10:36 PM
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That right!

Quick question. Since I'm probably going to leave the amp unbridged, the idea popped into my head to bi-amp the M80s just to see what it sounds like.

If I remove the jumpers on the binding posts, is each pair of posts a 4 ohm load, or are they now an 8 ohm load? My guess would be 8 ohm since the jumpers acted to put the loads in parallel.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335356 01/22/11 10:36 PM
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No, don't think so. Someone explained this awhile back, and they remain 4 ohm.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335357 01/22/11 10:51 PM
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They're reactive loads due to having the crossover involved, as you get into the "cut" range of the filter it starts to act like an open circuit. So the two halves of the speaker are not in parallel.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #335359 01/22/11 11:00 PM
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Yep. The two halves of the speaker present their 4 ohm load at different frequency ranges, and have a higher impedence outside of their active ranges.

The problem is that without an electronic crossover you're sending all of the frequencies to both amps anyways, so you wouldn't get the benefits of a "real" bi-amp system that sends different frequency ranges to each amplifier.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
bridgman #335360 01/22/11 11:18 PM
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But you do get the advantage of full voltage power to each side, rather than having that voltage split between the upper and lower sections, not sure if that makes alot of difference to SQ, might make it even a little tighter in the bass region.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
bridgman #335361 01/22/11 11:26 PM
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True, (and I know this was discussed many times on this board years back), but since each "half" of the speaker is only really reproducing it's frequency range and not reproducing the frequencies outside of it's range, the speaker is actually drawing less power from each amp stage at any given setting on the receiver when I bi-amp right?

What I mean is, lets say I have the receiver at -12db. The high part of the speaker is dissipating, let's say 10W, and the low part of the speaker is dissipating, let's say 10W also. That means the single amp is "delivering" 20W.

If I leave the receiver setting at -12b, and change to bi-amp, both low and high still dissipate 10W, but now each amp is only "delivering" 10W.

In the end, if I had my sound meter measuring before and after, the sound level should be the same, right? And, I gained headroom on each amp.

Am I missing something?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335362 01/22/11 11:34 PM
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I think if tweeters dissipate 10W, I think they melt.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335363 01/22/11 11:38 PM
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I just thought of something. To bi-amp I would need to split the input signal, so the pr-amped signal voltage would be cut in half as well. I would then need to raise the receiver volume to get the same db output. The only was I guess this really works is to have a pre-amp voltage doubler as well.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335374 01/23/11 03:29 AM
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Steve, I haven't been following this closely because I'm not very interested in DIY in general or class D amplifiers in particular, but I've now looked at the last couple pages. First point, as we've discussed at some length in the past, is that although two 8ohm loads driven in parallel result in a 4ohm net load, that isn't what's happening in a "4ohm" speaker. Say, at 100Hz if the impedance of a bass driver is actually 4ohms, because of the effect of the crossover circuitry the impedance of a "4ohm" tweeter section at that frequency might be more like 100ohms. The resulting impedance at 100Hz would then be 1/4+1/100=1/x; 25/100+1/100=1/x; 26/100=1/x; 26x=100; x=3.85ohms. So no, a "4ohm" speaker(which the M80s aren't at most frequencies, of course)isn't the result of two 8ohm sections being driven in parallel.

You ask "Am I missing something?" on the bi-amp question. Yes; although you refer to "each amp", there's only one in a two channel amplifier with one power supply section. The output transistors in each channel have no power of their own, and can't supply added "headroom".

Also, note on the voltage splitting question that two voltages in parallel don't form a voltage divider(series connection does that), and the output voltage to each load hasn't been cut in half.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335378 01/23/11 04:41 AM
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Originally Posted By: SRoode
If I leave the receiver setting at -12b, and change to bi-amp, both low and high still dissipate 10W, but now each amp is only "delivering" 10W.

Yes-ish, with the caveat that the split would probably be more like 4/16 than 10/10. Systems designed for bi- or tri-amplification generally have much larger amps for the woofers.

Originally Posted By: SRoode
In the end, if I had my sound meter measuring before and after, the sound level should be the same, right? And, I gained headroom on each amp.

Yes to the sound level, probably no to the headroom. There are a bunch of different ways an amplifier can "reach its limits" - output voltage, output current, temperature are the main ones. Most clipping happens when the amp reaches its voltage limit**, although shutdowns tend to happen as a result of current or temperature limits.

Since you don't have an electronic crossover before the amplifiers you're sending the same signal into both amps, and so the voltages will be the same and voltage limits will be hit at the same point as before.

If, however, the amp is "shutting down with 4 ohm load" as a result of current or overtemp limits, then the splitting of *current* could help a bit although this is where the 4/16 split bites you and you don't gain that much.

** it's actually not quite that simple because higher output currents tend to drag down the power supply voltage so you hit voltage clipping a bit sooner, but you get the idea...

Last edited by bridgman; 01/23/11 04:44 AM.

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Re: Gonna Try Building a 1kW Class D Amp for Only $396
bridgman #335384 01/23/11 06:04 AM
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I'm going to be over here with Ken, chanting in the corner.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #335386 01/23/11 06:40 AM
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Bet you have the kit page for Class D Audio open in a tab in your browser, too, though...


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
Ken.C #335390 01/23/11 12:14 PM
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Thanks for all of the great information guys, I'm really learning a lot. One thing I have not done is put my meter on the power supply to see if the voltage is drooping at high output. I would bet the toroid is just fine, but the DC power supply may be reaching it's limit. I'll try measuring on both sides of the dc power supply to see if the ac or dc (or both) dips on high output. I'm kind of hoping the dc output is drooping because that may be able to be fixed with the addition of another dc power supply (use one for each amp board).


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335391 01/23/11 12:16 PM
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I have affixed the additional heatsinks that I provided a link for several posts back on one of the amp boards. With no forced air cooling, the channel with the additional heatsinks is about 5 degrees C cooler than the one without. So, it's some progress.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335395 01/23/11 03:11 PM
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I think I'd use some ear protection on these 'tests'.

Re: Gonna Try Building a 1kW Class D Amp for Only $396
CatBrat #335398 01/23/11 03:33 PM
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I just ran a test with the left speaker "bi-amped", and the right speaker single amped. The "biamped" speaker can play with the receiver set 1.5 db higher before cutout than the single amped speaker. As bridgman predicted, when I raised the "bi-amped" speaker volume higher, it was the woofer amp that cut, while the mids and tweeters kept playing.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335426 01/23/11 07:43 PM
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Neat. Sorry, I hadn't realized you were able to drive the amps hard enough for them to shut down, or I would have been a bit more enthusiastic about your bi-amping experiment wink

I guess someone not fighting a flu bug could probably use that 1.5 dB number and work out the actual power split between woofers and mid/tweeters, but that isn't going to be me, at least not for a few more days.

EDIT - I assume we're getting into REALLY FREAKIN' LOUD territory here. You might want to build a small insulated structure on the outside of your listening room similar to what Axiom uses for high volume testing.

Last edited by bridgman; 01/23/11 07:45 PM.

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Re: Gonna Try Building a 1kW Class D Amp for Only $396
bridgman #335466 01/24/11 02:07 AM
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We are in VERY loud territory here, but I wanted to see if I was getting what I "paid for". In reality, I do not think these amp modules can deliver 250W per channel @ 4 ohm, no matter what. I'd say they comfortably can deliver 60W per channel constant. The sound is definitely better than the AVR-3806 though. During normal listening conditions, I am keeping the receiver at -12db, which is about 87-90 db in the room. So, there is plenty of headroom. It has been a fun experiment though!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #335477 01/24/11 04:10 AM
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I suspect there's still a relatively constant ratio between total sustained power output in watts and total power supply weight in pounds, but I no longer remember what the constant was wink


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
bridgman #340360 02/28/11 05:41 AM
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Anything further to add to this thread Steve? Are you using this amp in the "new" theater?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
jakewash #340366 02/28/11 11:21 AM
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I'm using the amp in the bar area now. I did buy a switched mode power supply that seems to keep the amp "happier". I'm going to build an enclosure for the amp when I get some free time and keep it in the bar area permanently. I have my bluetooth receiver hooked into it, so I stream my iPhone music to it. It works pretty nicely.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #340441 03/01/11 02:41 AM
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Originally Posted By: SRoode
I'm using the amp in the bar area now. I did buy a switched mode power supply that seems to keep the amp "happier". I'm going to build an enclosure for the amp when I get some free time and keep it in the bar area permanently. I have my bluetooth receiver hooked into it, so I stream my iPhone music to it. It works pretty nicely.


Damned with faint praise.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
2x6spds #340443 03/01/11 03:09 AM
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Well, I can't say I "love" the amp (I like it a lot), but it is a very nice amp for the price. I'm proud I was able to build it myself. In that regard, I think it will serve it's purpose entertaining guests in the bar area. It has not clipped with the new power supply.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #340455 03/01/11 06:27 AM
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Mr. Roode, congratulations on building an amp which did not burn your house down. You are a braver man than I am.

However, I am curious in that I have been informed by those who know that all well designed solid state amps perform identically within their specified performance paramters. Do you have any amps which have superior sound quality to your DIY effort?


Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.
Re: Gonna Try Building a 1kW Class D Amp for Only $396
2x6spds #340458 03/01/11 07:39 AM
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Originally Posted By: SRoode
The sound is INCREDIBLE! It really does sound punchier than the AVR-3806. Very clear and tight. The wife said it was not even close (she liked it better than the AVR-3806), but it was a bit more close for me. Definitely punchier and tighter sound. If it sounds just as good unbridged with a higher output headroom before overtemp, I may leave it that way and hook the VP180 up now.

So it is pretty close to his receiver's built in amp, just the performance increase you'd expect from more power.

The problem is, it gets outside of its specified performance parameters a little too easily with the power supply he was originally using.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
ClubNeon #340459 03/01/11 08:00 AM
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Thank you ClubNeon. I didn't read all 12 pages.

I have a bunch of low power Class D amps (T-Amp types).

~5 wpc into 8 ohms. They drive M3s very nicely. M22s, not so much.

I like them a lot.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376824 05/22/12 08:24 PM
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I finally did finish off the amplifier! I bought an unfinished maple box on E-Bay for about$15, and drilled it out, then stained it. It took a good weekend to put everything together, but I'm really happy with it. I decided to use only one of the amp modules, so it's rated at 125W a channel 8 ohm, 250W a channel 4 ohm. The switched mode power supply is rated 500W continuous. I've been able to crank it all the way up and it does not trip out and sounds great. I keep it propped open slightly when I'm usingit so the air has a place to escape. It's a very low speed fan, almost silent, and the amp stays nice and cool (the heatsinks are barely warm to the touch). It's a nice little converation piece for the bar area.






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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376825 05/22/12 08:32 PM
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Sweet! Never thought of using a jewelry box type of thing as an amp cabinet. Was assembly pretty straightforward?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376829 05/22/12 09:58 PM
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It was. The only hard part was getting everything assembled in a relatively small space... Not much room to work.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376830 05/22/12 10:15 PM
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Just beautiful, Steve. I love it. Nice work!


bibere usque ad hilaritatem
Re: Gonna Try Building a 1kW Class D Amp for Only $396
tomtuttle #376831 05/22/12 10:30 PM
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That's nice and tidy! Good show.

Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376841 05/23/12 12:35 AM
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Very cool, Steve! I like your creative use of the box. It does look very nice.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376845 05/23/12 01:24 AM
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I like.


Rick


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376857 05/23/12 03:29 AM
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That's pretty damn cool.

Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #376918 05/23/12 10:07 PM
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Thanks guys! I hooked up the M80s as a final test. I ran the amp at full blast (I-phone was the pre-amp and source)for 2 hours. No tripping, 100db peak output at 1m (both speakers were running), and when I shot the heatsink with the infrared gun, it measured 94F. Not a bad little amp!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377639 05/31/12 06:01 PM
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One thing I have noticed over the last week or so of listening is that the I-Phone just does not have enough "umph" to serve as an adeqaute pre-amp. When I hooked my Onkyo receiver up to the amp and used the pre-outs, I was really able to push the amp and the sound was great. So, I decided to hunt around for a little pre-amp (or headphone amp) for the amp I built. I finally decided on this one:

http://www.ebay.com/itm/Indeed-G3-Headph...=item3a699d3c70

It's a tube pre-amp/headphone amp, and it looks like a tweaker's wet dream. Some guys on another board had a chance to play with it and some have even modded it a bit:

http://rockgrotto.proboards.com/index.cgi?board=b&action=display&thread=7174#

It's on it's way from Hong Kong right now, but it won't be here for a couple of weeks. Has anyone here had any experience with this unit? I know some of you are into headphone amps.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377644 05/31/12 06:32 PM
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That's gotta be good when it's described as "it sounds with rich bass and clear treble for joy"! smile


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377645 05/31/12 07:13 PM
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Originally Posted By: SRoode
One thing I have noticed over the last week or so of listening is that the I-Phone just does not have enough "umph" to serve as an adeqaute pre-amp. When I hooked my Onkyo receiver up to the amp and used the pre-outs, I was really able to push the amp and the sound was great. So, I decided to hunt around for a little pre-amp (or headphone amp) for the amp I built. I finally decided on this one:

http://www.ebay.com/itm/Indeed-G3-Headph...=item3a699d3c70

It's a tube pre-amp/headphone amp, and it looks like a tweaker's wet dream. Some guys on another board had a chance to play with it and some have even modded it a bit:

http://rockgrotto.proboards.com/index.cgi?board=b&action=display&thread=7174#

It's on it's way from Hong Kong right now, but it won't be here for a couple of weeks. Has anyone here had any experience with this unit? I know some of you are into headphone amps.


A tube preamp is a great idea for a class D amp. However, a headphone amp limits you to a single source input.

I picked up a TCC TC 754 solid state preamp from Amazon.com for my Dayton DA100(?) Class D amp.



It works very well and has multiple inputs.


Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.
Re: Gonna Try Building a 1kW Class D Amp for Only $396
2x6spds #377654 05/31/12 11:03 PM
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I actually saw that one and several others when I was looking around. The problem (for me) with the TC754 is that it is a 0 gain preamp, the volume control only attenuates. I needed something that would give me a pre-amp boost to help with the really low input signal of the I-phone. The pre-amp I ordered has a 20 db gain.


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377681 06/01/12 05:42 PM
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I'm giggling like a little schoolgirl!




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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377697 06/01/12 08:09 PM
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Cool!


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377709 06/01/12 10:43 PM
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Hey! That's my cigar humidor?!?


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377710 06/01/12 10:58 PM
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Since there was a Cohiba in the box beforehand, I refuse to answer on the gorunds that it may incriminate us... wink


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #377711 06/01/12 11:08 PM
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Very cool, Steve!


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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #378249 06/10/12 12:15 PM
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The Pre-amp arrived in the mail yesterday, on 12 days from Hong Kong, not too bad! The difference having a pre-amp in line with the amp is really night and day. I'm really able to drive the speakers now, and I have not even attempted to turn the volume all the way up (I have had it as high as about 60% and that was more than enough). I've also tried using it as a headphone amplifier and it sounds great that way as well. There are only 2 issues I have with it, and I knew about them before I bought it. First, the black heatsinks get INCREDIBLY hot. I shot them with my infrared thermometer, and they were about 75C. Since this is a class A amp, it seems to always be this temperature when on, regardless of the listening volume. Supposedly this temperature is okay. The next issue is interference. Since the amp is not in a shielded enclosure, you do not want to bring yor iPhone within about 8 feet of this amp. One of the guys on another board fixed this by plating the top and bottom acrylics with aluminun foil and tying it all to a common ground. I may enclose it in the future, but for now it's okay since I play music from my iPhone to a Bluetooth receiver... No issues with that.

Anyway, I love the pre-amp. It's a great deal for $119 shipped.





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Re: Gonna Try Building a 1kW Class D Amp for Only $396
SRoode #378250 06/10/12 12:38 PM
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Neat lookin' little thing! Glad you're enjoying it all.


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