Small Clone Depth knob mod?

[Rick1114]

Hi all,

I want to add a depth pot instead of the switch on my new EXH Small Clone. Would that be as easy as removing the switch and wiring up a pot in it's place? I haven't opend'ed er up yet.

If it's that easy what kind of pot is recommended?

Thanks,

Rick

[Mark Hammer]

Ina word, Yes. Go to the Tonepad site (www.tonepad.com) and see their "Heladito" (Small Clone) project for information on that mod.

[Rick1114]

Thanks Mark,

I just printed the scematic and took a quick look at it. It's based off the PBC board tonepad sells for their clone. Looks easy to do, I just hope the board in the EHX small Clone is the same as the tonepad clone - I'll have to see when I get home. Otherwise I'll probably be stumped!

Rick

[Mark Hammer]

The layout may be different but the design will be the same. Francisco Pena (Mr. Tonepad) used to have a different project file up that included the original depth switch and instructions for how to mod it to a variable control. The newer file he has posted omits the switch and only shows it post-mod, so no wonder there is some confusion.

The original will have a 4k7/2k7 resistor pair, with their junction tied to the 39k/10uf RC combo. Normally, the depth switch simply connects the 2k7 resistor to ground or breaks that connection. The variable depth mod simply replaces the 4k7/2k7 pair with a 10k pot. The wiper is what ties to the 39k/10uf pair.