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[joecool85]

This is the first design I've finished.  It gives a good solid overdrive/distortion depending on how much you turn up the gain.

[leonefranca]

Oh man!
Maybe itīs an idiot question...

But I didnīt understand that 22uf capacitor in R1.

[n9voc]

Joe, lets see if I'm right:

The 22 uF capacitor on the wiper of R1 allows you to vary the gain of the circuit while maintaining a stable DC bias.  R3 controls the overall volume, R1 the level of distortion.

(did I pass the quiz?)

[joecool85]

Joe, lets see if I'm right:

The 22 uF capacitor on the wiper of R1 allows you to vary the gain of the circuit while maintaining a stable DC bias.  R3 controls the overall volume, R1 the level of distortion.

(did I pass the quiz?)

Bingo.  I've done it without the 22uF cap and it does work but it doesn't sound the same.

[casiomax]

everytime i put the overdrive circuit in place, between the preamp and amp, humming noise comes out from my amp, does anybody knows why?

[n9voc]

Do you have the DC ground of the tonemender tied to the DC ground of the amplifier?

[casiomax]

I have read this somewhere that the DC ground supposed to be separated from the amp and tonemender, which mean using a different supply.

and yup, i supply the amp and tonemender and fx using a single powersupply.

[joecool85]

Sounds to me like ground loop oscillation or a poor solder.