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Re: LFR1100 Active
Ian #431868 04/16/19 02:34 AM
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Just reread Andrews comments ...
think I understand

Front power switch is similar to trigger off (20W consumed in standby)
The rear power switch is completely off (0 Watts)
Is that correct?

Does the amp shut down and power up gracefully when using the rear switch?

Re: LFR1100 Active
Ian #431869 04/16/19 03:04 AM
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Yes.

I've had no problem with turning the rear switch on. I've tried it with two 1000s and one 1500. There are no clicks, pops, farts or burps. On the 1500, when you turn it on, you will hear the pleasant sound of magnetostriction in the 30 pound toroid that graces the innards.

I have noticed when the rear switch is turned off on the 1500, and the front switch is still on, for about 753 msec, I hear a high frequency squeal in my VP160 as if someone quickly choked a squirrel. It surprises me every time, and every time I have to remind myself I don't house any humans or squirrels in my 160.

Re: LFR1100 Active
Ian #431920 04/24/19 11:26 PM
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Being sensitive to phantom power (especially if it's over a watt, no less 58W) I'd like to propose that:

A) the DSP have a trigger which shut's it down completely ... and if there is any chance that there might be a transient on its output then the DSP also have a trigger out which shuts down the amp before the DSP (and turns it on after the DSP is settled).

B) the Amp shut off completely after say (10min). I can only guess that this is not being done because the power supply takes a while to come back up. For people who want instant on then maybe this option is switch selectable.

Thoughts?

Re: LFR1100 Active
Ian #431921 04/24/19 11:55 PM
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What you're asking for is doable but it increases part count and complexity.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: LFR1100 Active
Mojo #431922 04/24/19 11:59 PM
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relay (preferably latching) or have a separate power module (TI makes a few single chip supplies which can efficiently supply what's needed at a few mW of cost)

Re: LFR1100 Active
Ian #431923 04/25/19 12:21 AM
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Mojo,

You edited your post and left my answer hanging ...

in any case ... for the few parts it takes the product is greatly improved ... if you care about wasted energy ... not to mention paying for it (but I guess in the winter it's just adding needed heat) it's a no-brainer ...

Rich

Re: LFR1100 Active
Ian #431924 04/25/19 12:36 AM
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Rich, I edited while you were posting your answer. It's actually not as simple as you proposed but yes, it can be done.


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: LFR1100 Active
Mojo #432098 05/05/19 03:28 AM
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Originally Posted By Mojo




I have noticed when the rear switch is turned off on the 1500, and the front switch is still on, for about 753 msec, I hear a high frequency squeal in my VP160 as if someone quickly choked a squirrel. It surprises me every time, and every time I have to remind myself I don't house any humans or squirrels in my 160.


This begs the question - how many squirrels have you heard being choked? laugh

Re: LFR1100 Active
Ian #432099 05/05/19 04:08 AM
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Never seen one choking on a peanut? It must be Andrew's sense of humour designing a turn-off circuit that sounds like that. smile

https://youtu.be/xOcVuWMP9t8?t=15


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
Re: LFR1100 Active
Ian #432217 05/15/19 07:30 PM
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I hope Ian is OK. Last I heard, he was bruising his corpus callosum trying to integrate the various driver curves for the active LFR1100 in the digital (DSP) domain. I hope he hasn't blown a brain lobe!


A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
Air Force, Freedom
had v2
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