Aion Klon Refractor Schematic question

[tomer629]

I dont have a 390n capacitor for C6. I can wire a 220n and 150n in parallel to get 370n. Close enough? Will this affect the sound of the pedal at all?

See attached schematic:


Thanks!

[antonis]

Will this affect the sound of the pedal at all?

Not at all..

[tomer629]

Thanks!

Would you mind elaborating a bit? Trying to learn more about how these circuits work. I see its attached to the gain control so I had thought maybe it might have some affect on tone.

[antonis]

It's complicated a bit 'cause there are two feedforward networks in parallel with op-amp gain stage..

Focusing on GAIN B pot, C6+R9 are set in parallel with it (and R8) and dominate equivalent resistance value at resonance frequency where 1/2π*f*C = R    (C6 capacitive reactance equals R9 resistance) - at about 408Hz

Considering negligible items values tolerance (not true.. ), 370nF set resonance frequency at about 430Hz, hence it "offsets" it about 5%..
(no big deal if you take into account almost equal real world caps values tolerance..)

[tomer629]

Awesome thanks!