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I wired up the pot, jack and piezo today, plugged them in to a guitar amp, held them under the string of another guitar and plucked, it worked like a charm except for one thing. Apparently I wired the pot backwards or something. When you turn it toward off, it gets louder and then when you click it off, it doesn't shut off. Turning the other way makes it quieter. I wired it per directions I found in the Radio Shack reviews which also matched pictures I found of other people's pots.
Blue wire on left #3 goes to red wire on piezo. Blue wire in center #2 goes to positive on jack.
Brown wire goes to negative on jack and black on piezo.
Do I just need to switch the blue wires?
I know my soldering is messy, I have a crappy 35 year old, 30W iron.
Here is the pot I used:
I've got no idea, but I'd try it. What have you got to lose except time?
And besides, it'll only improve the soldering skills. :)
Yep, that's how I wired it.
Looks correct, follows the diagram I made that Dan posted. I'd try swapping the wires on the 2 outside lugs of the pot.
I'm slowly figuring this out. Apparently to use the on/off switch I need to move the wire from the #2 lug (middle) to the lower right lug on the backside. Might still have to swap the ground, will test afterward and see.
You're right, I need to buy a new multimeter and work this out. I got caught up in all the other stuff and got lazy with the electronics.
Do you really need an on/off pot?
No, I suppose not. It was just there and seemed a shame not to use it.
I was just curious if this is what is causing the problem, probably not but I have never used a pot with an on/off and am wondering if it's the root of the problem?
Well in a sense, yeah. I used an audio pot with an spst (on/off) switch which apparently most people don't use and I wasn't familiar with how to wire it. It does control volume as wired, it just isn't wired correctly for the type of switch it is. I may just leave it alone as I don't really need an on/off.