Hi all!!
I am working on my first pedal efx; it is the distortion+, everythings seem to be alright but when I test it with my guitar I obtain a strange result:
the dist pot works only at the end of its rotation, until that point the sound is clean and very very quite....on my schematic I have a value of 1M lin.pot but on other schematics they show a value of 1M reverse log.
What do you think about it ,guys?...
Thank you so much!!
eFFe
A gain-control pot like the one in the MXR Dist+ can be *any* taper. The various tapers specified here and there are for the purposes of having differences in the amount of gain in a certain part of the range spread out or clustered together. Reverse-log lets you spread out variations in high gain over a broader range of the pot's rotation, using a clockwise increae in gain. Of course you could always wire up a regular log pot the other way and have gain increase as you turn it counterclockwise. Same deal, different direction.
On the other hand, you could be like me and basically use it dimed or tinker around with things just at the edge of clipping. If you're like that, a linear pot is fine.
The other thing to do is divide the gain range in half. Wire up a toggle switch and a 250k resistor in parallel with the pot. When you close the switch, the pot now varies the resistance between 0 ohms and about 200k or so. This will let you dial in finer gradations of high gain.
hello there, use a 50kra (reverse audio taper) pot--you can easily find these because they're used in all fender blackface/silverface style amps as the tremolo intensity pot. these work great for the distortion control function in the mxr box. rh