Cry Baby to VoX switch & true bypass

[yeeshkul]

Apart from disconnecting the input buffer(for true bypass) there are 4 pieces with different values. I wanna use a DPDT toggle switch that allowes just 3 pieces to be changed (2 caps around the output and the Rq). How about the emitter resistor 470R -> 510R? Is that an important change?

[jonathan perez]

Apart from disconnecting the input buffer(for true bypass) there are 4 pieces with different values. I wanna use a DPDT toggle switch that allowes just 3 pieces to be changed (2 caps around the output and the Rq). How about the emitter resistor 470R -> 510R? Is that an important change?

that 470 is the bass/gain resistor. more than 470 means less gain/bass, and vice versa.

if youre going to want to change 3 components, youll need a 3PDT.

[boyersdad]

Or even a 4pdt toggle. I've found a few of those. They're about an inch long though, so you need some room inside. In a CB it shouldn't be an issue.

[yeeshkul]

yeah 3PDT, of course . I will definitely look for that 4PDT one. Thanks guys!

[yeeshkul]

actually, i have found out that my Cry Baby differs from VOX just by 2 resistors and the input buffer(the caps around the output pot are 220n). My values are 390R and 82k and the VOX values are 510R and 100k. Is it even worth changing? Has anyone tried it?

[momiel]

they have different inductors too, and it's a big thing...

[jonathan perez]

they have different inductors too, and it's a big thing...

i disagree. measurments are all over the map for both dunlop and vox. some (most) dunlop inductors ive ever found measured closer to 500mH, usually around 540mH. whereas the vox inductors ooften measured around 650mH.

different, yes. big thing, no. inductors are only parts to the puzzle. i wouldnt bother changing em... check out geofex.com for the technology of the wah pedal, its extremely useful.

[yeeshkul]

i guess i have this Cry Baby:
http://www.freeinfosociety.com/electronics/schemview.php?id=351

Guys can please anyone tell me what's the reason for the parallel combination of the big cap 220u and the small boy 1.1n next to the protective diode?

[shooter_mi]

Is there any advantage to removing the input buffer section? What would be the effect of converting to true bypass and leaving that section intact?

[yeeshkul]

The input buffer keeps the circuit from sucking too much signal when turned off(a big input impedance). There is not much reason for the buffer when you convert the switch to DPDT(3PDT) because wah usually goes  first - before the other stompboxes and so it doesn't need a big input impedance. Some people say that it works the same way when you leave the buffer where it is. If you wanna the same circuit + DPDT, leave it there. If you wanna VOX, i suggest removing it - it is quite simple operation anyway