- Make R4 something like 470k and move it to the + input of the opamp instead of the - input. You're now adding a DC component to the output signal of 5.6*Vb. While it's not clear how high Vb is it suggests that the DC level on the output will be at Va level (unable to go higher) all the time.
Dirk_Hendrik wrote:C2 can go to ground just as well.
Dirk_Hendrik wrote:The Tone stack components (C18 and the mid control) can go to ground provided you add a cap in between the 2nd opamp output and the tone stack. This would have my personal preference. Bring the master CCW connection to ground in that case as well.
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