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#334713 - 01/17/11 06:58 PM Gonna Try Building a 1kW Class D Amp for Only $396
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1278
Loc: Fishers, Indiana, USA
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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#334714 - 01/17/11 07:03 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
Adrian Offline
axiomite

Registered: 12/27/08
Posts: 6890
Loc: It's all about the location.
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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#334719 - 01/17/11 07:16 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: Adrian]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1278
Loc: Fishers, Indiana, USA
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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#334723 - 01/17/11 07:29 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13579
Loc: Iowa
do they furnish the instructions? Also, what about the case? Can you provide links?
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#334727 - 01/17/11 08:00 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SirQuack]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 18044
Loc: NoVA
I'll be VERY interested to find out how this goes!
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#334728 - 01/17/11 08:10 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: Ken.C]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1278
Loc: Fishers, Indiana, USA
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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2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos, 1 AxiomAir N3

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#334738 - 01/17/11 10:05 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
terzaghi Offline
connoisseur

Registered: 04/04/07
Posts: 4870
Loc: Tulsa, Oklahoma
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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#334747 - 01/18/11 12:25 AM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: terzaghi]
St_PatGuy Offline
axiomite

Registered: 03/07/05
Posts: 7463
Loc: Glendale, Arizona
Looks good, Steve! I'm excited for you. Let us know how the build goes!
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#334749 - 01/18/11 01:10 AM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: St_PatGuy]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11694
Loc: Richland, WA, USA
Very cool. I may have to look into this when I need more channels. Good luck!

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#334750 - 01/18/11 01:51 AM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
That Class D Audio kit gets my thumbs up too.
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