Amp Camp Amp - ACA
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tinitus
diyAudio Moderator R.I.P.

Join Date: Nov 2005
Quote:
 Originally Posted by Jay 19V single ended for 5W...
ahh
been looking at this regulated power supply, not knowing what to do with it
a friend dropped it on my doorstep
0-24V, 10A
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 21st July 2012, 10:38 AM #192 tinitus   diyAudio Moderator R.I.P.   Join Date: Nov 2005 14db gain, 5watt me think compression driver
 21st July 2012, 11:59 AM #193 Antoinel   diyAudio Member   Join Date: Jan 2012 Location: Pennsylvania Thanks Mr. Pass for the explanation and the rigorous and exact calculations. Mine was very simplistic [Ohm's Law]. I can't even say what's a couple of unaccounted Ohms among DIYers? A lot in this power application.
 21st July 2012, 02:38 PM #194 LBHajdu   diyAudio Member   Join Date: Feb 2002 Woow it seems like finding the output Imp. is pretty complicated. Steps 1)find the transconductance at your biased current 2) calculate your theoretical expected open loop gain 3) measure actual open loop gain 4) calculate missing gain and equivalent resistance end then output impedance 5) calculate for correction of feedback The amp camp amp is working already, I'm learning something new. Thank you Mr. Pass
Antoinel
diyAudio Member

Join Date: Jan 2012
Location: Pennsylvania
Quote:
 Originally Posted by LBHajdu Woow it seems like finding the output Imp. is pretty complicated. Steps 1)find the transconductance at your biased current 2) calculate your theoretical expected open loop gain 3) measure actual open loop gain 4) calculate missing gain and equivalent resistance end then output impedance 5) calculate for correction of feedback The amp camp amp is working already, I'm learning something new. Thank you Mr. Pass
If I may add to the above in the abscence of loop feedback. The Resistance of the gain MOSFET = 9.5 V divided by 1 Amp = 9.5 Ohms. The upper MOSFET [mu follower] is a constant current source of very high impedance; i.e. >>>10 Ohms. After all, we all believe [and grew up with the concept] that a CCS defies Ohm's law; but appears to be intrinsically very high resistance. It does not count here relative to 9.5 Ohms. So, looking in the output node, two resistive paths are evident in parallel: 9.5 Ohms//may be 1000 Ohms for example [ignore it]. One is left with 9.5 Ohms or 10 Ohms [1 significant figure]; like the calculated result of Mr. Pass.

 21st July 2012, 04:51 PM #196 Nelson Pass   The one and only     Join Date: Mar 2001 The mu follower has a relatively high DC impedance, but it is an active component with an AC negative resistance. It contributes to raising the apparent output impedance of the amplifier.
 21st July 2012, 05:06 PM #197 Antoinel   diyAudio Member   Join Date: Jan 2012 Location: Pennsylvania Thanks again Mr. Pass for your explanation.
Variac
diyAudio Editor

Join Date: Dec 2001
Location: San Francisco, USA San José, Costa Rica
Well this does point out that the amps are so small and cheap that multi-amping might be a great strategy. Especially with active or passive crossovers at the amp inputs- the amp only "sees" the one driver.

Its looking like a classic... thinking of some crazy idea? Make a couple of ACA's and try it out!
Quote:
 Originally Posted by tinitus 14db gain, 5watt me think compression driver
__________________
"The geek shall inherit the earth"
2017 Burning Amp is November 12 in S.F. Thread here on diyAudio:
http://www.diyaudio.com/forums/clubs...francisco.html

Last edited by Variac; 21st July 2012 at 09:45 PM.

tinitus
diyAudio Moderator R.I.P.

Join Date: Nov 2005
Quote:
 Originally Posted by Variac Its looking like a classic... thinking of some crazy idea? Make a couple of ACA's and try it out!
also have some 'smaller' heatsinks

ehh, schematic shows + output at ground
I suppose it means phase inverting output

 21st July 2012, 09:36 PM #200 Variac   diyAudio Editor     Join Date: Dec 2001 Location: San Francisco, USA San José, Costa Rica inverting, true. But was easily fixed as you mention.. And its cheap also because of the smaller required heatsinks. Most of us have some the appropriate size sitting around. Although the power supplies are really a bargain! __________________ "The geek shall inherit the earth" 2017 Burning Amp is November 12 in S.F. Thread here on diyAudio: http://www.diyaudio.com/forums/clubs...francisco.html Last edited by Variac; 21st July 2012 at 09:46 PM.

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