Need a bit of help trying to understand this circuit. I would like to use the tone control board for a project basically passive skipping the preamp section of it and then later following it with my own preamp. I understand ill loose about half my gain but I'm not worried about that right now. It looks to me like the typical tone control circuit used in other amplifiers but where the output should be in between the 2 pots it goes to ground instead?
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This is a feedback (active) tone control circuit, connected between the output,
and the emitter of the input transistor.
Thanks for the reply. So does that mean it can't be used as a passive tone control with a bit of modding?
It's possible, here's an example. You'd want a design that keeps the same 10k pots that you have now.
The James-Baxandall Passive Tone-Control Network
Equalisers
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Okay, so after studying the article posted I think I have it figured. For the schematic above I would need to cut the track that goes from the 25k pot and 10k pot to ground and use that as my output then use the trace from c331 and c332 for my input. Basically reversing the way it is now. I also modeled the values on the tone stack calculator.
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Good luck. The nice thing about passive circuits is that it's hard to burn them up.
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