Adding an expression pedal to control the rate on the Madbean Wigl

[GrooveChampion]

I've read the article regarding expression pedal modifications on any pedal, I've got the switched stereo output jack, but problem is I have no idea which one of the lugs on the rate knob are connected to ground. I have no idea how to wire this.

A little help please?

[Travis]

Why would you connect one of the lugs to ground?

[GrooveChampion]

From what I understood in the Geofex article one of the lugs is usually a ground lug, now I might be mistaken about it cos I have no idea if any of the lugs on the rate pot even go to ground, which make everything a bit more complicated for me.

I have no idea how to wire this thing, this is the switchable stereo jack I bought:

[nocentelli]

That jack is not going to do it: Many controls do have lug 1 as ground (e.g voltage divider volume pots) but not this one. The wigl rate is a voltage divider, but it connects via a 1k resistor to vb aka 4.5 volts on lug 1 so your metal frame jack will short the 1/2 supply bus to ground via the enclosure.

The wiring for a switching jack for exp pedal connection is shown in a thread below about adding an expression pedal jack to the split 'n blend circuit which has a similar issue (blend pot needs to not be grounded at lug 1) so you'll need to follow that diagram using an insulated plastic jack, or at a push try putting electrical tape around where your metal jack meets the enclosure surface.

[GrooveChampion]

Actually I did insulate the jack from the chassis using electrical tape.

[nocentelli]

[GrooveChampion]

Thanks man! I actually have these mono switched jacks, so I just sacrificed one and pulled one of the lugs sets off of it and added it to another mono to create a stereo jack! Cant believe I spent 10 bucks on those Switchcraft things....