100W CFA with mosFET OPS

[dadod]

Here are schematics BOM and gerbers of the amp described in https://www.diyaudio.com/community/threads/200w-mosfet-cfa-amp.243481/page-75#post-6000469
Damir

R20 and R24 in the amp are there for overcurrent protection, but used value is a bit to high, better use 1.5k instead 6.8k.

 

[lineup]

Can you post an image of the schematic?

 

[dadod]

If you follow the above link it will direct you to the main thread with the schematics and all other needed information.

 

[dadod]

Here is the amp JPG schematic with new R20 and R24 values.

 

[lineup]

Thanks.
I like CFA Current Feedback Amps.

 

[dadod]

I would like to have some photos here if someone decides to built this amp.

 

[chat72]

One channel tested, bias and offset are good. Might be a while before I can finish both channels though.

 

[chat72]

Ok I have time before I'm away, here is a finished 100w CFA. Excellent sound, CFA is growing on me. Supply is unregulated +/-50vdc, bias is around 100mA, VAS current is a bit high at 10mA VAS trs are heating up and current through R5 R6 are around 2mA.

 

[dadod]

chat72,
VAS current could be to high if the red LEDs D11 and D12 are with too high forward voltage (could be up to 1.9V). I used HLMP-K150 red LEDs with about 1.7V.
BR Damir