Implementing a bass treble tone control circuit into a usb powered audio amplifier.

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Cas Lijnen

Joined Mar 12, 2018
2
My question is: if it is possible to add the tone control circuit into the audio amplifier?

If so I guess I'd need to implement two, one for the left channel and one for the right channel. And I could use a stereo potentiometer to control both of them. I would put one between C2 and VR1 and the other one between C3 and VR2.

But here is the problem, I don't know if implementing these tone control circuits would mess up the rest of the circuit. Also maybe the values need to be changed? And i wonder if the spot where i'd put them is alright?
 

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crutschow

Joined Mar 14, 2008
34,285
The impedances will interfere with the tone control operation.
To minimize that, try reducing all the tone control resistors by a factor of 10 (including the pots) and increasing all the tone-control capacitors by the same factor.
Eliminate R2 and R3 on the amp input.
Increase C2 and C3 to 1μF (non-electrolytic).
Increase the VR1 and VR2 pot size to 100kΩ (these should be audio pots, not linear pots).

If the amp appears to have too much gain, add a resistor in series between each volume pot and the tone control.
Start with about 50kΩ.

So the signal path is now: PC output → cap (C2 or C3) → tone control →optional resistor → volume control (VR1 or VR2) → amp.

You will need two stereo linear potentiometers, one for bass and one for treble.
 
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