Sandy - Power VFA

[cosmic]

Hi Sandy,
I am planning to build your design, just didn't have time yet. Meanwhile I found the attached design, want to know your take on it. I like the lower THD 0.003% @ 190W and it is a very interesting design.

 

[SandyTodorov1]

I'm not a fan of a bridge amp made from a single amp.
Saving a few low-power transistors is not worth it.
The difficulties of wiring such a board are much more significant.
Preferably two amplifier stages each on a separate board connected already in a bridge connection.

And a three-stage amplifier is a bad idea if the same and even higher amplification can be done directly with two amplifier stages.
Two amplifier stages are always more broadband than three. And that means high frequency and deep negative feedback.

 

[cosmic]

Got it, basically its a 2 in 1 design, if we clone input stage transistors it will become 2 amps.