Quasi-comp bipolar amp schematics

BlackCatSound · 23rd January 2006, 09:20 PM

Does anyone have a schematic for a quasi comp bipolar output amplifier?

I've been cleaning the blackened components from one of my favorite sounding PA amps (beer + 99v rails don't mix

) and I was surprised to find it has an all NPN output stage. (16 Sanken 2SC3264 per channel) I've never looked into quasi comp outputs, I've always stuck to true complimentary.

Its an old Malcolm Hill design I believe, pre Chameleon. Gets very hot when driven hard but sounds really nice. Perfect for a bass amp, which is just what I'm after for a 3 way active speaker system I'm building

Ta!

quasi · 23rd January 2006, 10:11 PM

Hi BlackCatSound,

I recently posted this cct that I developed as a variance of a mosfet design.

http://www.diyaudio.com/forums/attac...amp=1137818325

It is part of this thread;

http://www.diyaudio.com/forums/showt...751#post822751

The cct is untested at this stage but if you can wait, I will try to do a board layout over the next few weeks.

Cheers

BlackCatSound · 23rd January 2006, 10:24 PM

Looks interesting, I didn't make it to the end of that thread first time around

Really I'd be looking for ~400W/8R. I'd probably use the 2SC3264 as I have to buy a pile of them anyway.

23rd January 2006, 09:20 PM	#1
BlackCatSound diyAudio Member Join Date: Oct 2004	Quasi-comp bipolar amp schematics Does anyone have a schematic for a quasi comp bipolar output amplifier? I've been cleaning the blackened components from one of my favorite sounding PA amps (beer + 99v rails don't mix ) and I was surprised to find it has an all NPN output stage. (16 Sanken 2SC3264 per channel) I've never looked into quasi comp outputs, I've always stuck to true complimentary. Its an old Malcolm Hill design I believe, pre Chameleon. Gets very hot when driven hard but sounds really nice. Perfect for a bass amp, which is just what I'm after for a 3 way active speaker system I'm building Ta!

23rd January 2006, 10:11 PM	#2
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	Hi BlackCatSound, I recently posted this cct that I developed as a variance of a mosfet design. http://www.diyaudio.com/forums/attac...amp=1137818325 It is part of this thread; http://www.diyaudio.com/forums/showt...751#post822751 The cct is untested at this stage but if you can wait, I will try to do a board layout over the next few weeks. Cheers __________________ http://sites.google.com/site/quasisdiyaudiosite/

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23rd January 2006, 10:24 PM	#3
BlackCatSound diyAudio Member Join Date: Oct 2004	Looks interesting, I didn't make it to the end of that thread first time around Really I'd be looking for ~400W/8R. I'd probably use the 2SC3264 as I have to buy a pile of them anyway.

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