Quote:
Originally Posted by orbanp1
Here is a simulation of a Hacker audio amp with the DC voltages.
It is the A205, that is the schematics I did find.
I did some simplification, omitted the Vbe generator for the final stage, just used a simple resistor and adjusted it for about 2.8mA idle current.
Also assumed 18V supply voltage (2x 9V?)
Also left out some of the tone control circuits.
Audio gain is about 60dB.
Hopefully it is similar to your amp and it helps you.
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Good work
The gain is on the high side because the bass control network was left unconnected - it is a loss network. If you set R8 to 0k (bass at min) and join R9 to the collector of Q5, you should find the gain is nearer to 45dB.
It must have taken a while to arrive at the resistors that have replaced RV3. I admit that I lack patience with Spice
