Wah stopped wahing. waaaaaah

[MmmPedals]

have a crybaby. all stock except i changed the "Q" resistor to taste. It had an old dc jack (like a 1/8" jack) so i opened it up to replace it with something i could use. now i acts like a volume pedal. I checked the 2.2uf cap by measuring both leads. the pos lead read ~40mV. the neg. lead 0. which to my knowledge if ok.
So what could other potential problems be?
How can i test the inductor?

[jasperoosthoek]

If for some reason the wiper of the wah pot is grounded a crybaby wah will start to work as a volume pedal. What happens is that the pot starts to work as a variable resistor (rheostat) wired from the output to the ground: basically bleeding the signal to the ground. The amount of signal lost is related to how far you push the wah. (A volume pedal is born). This also means that the feedback loop (controlling the amount of wah) is broken and therefore the amount of wah never changes.

A wah generally does not change volume. If the inductor is broken then the wah will probably start to work as a low pass filter with variable cutoff frequency. Similar to the normal wah operation but without the resonant peak. Is there still a resonant peak in your signal? Say, at some point your guitar notes are very loud and just a few frets lower and higher they are normal? If this is still there then at least the inductor is fine.

[MmmPedals]

There is a volume boost when the wah is ON. not sure about the resonant peak, it seems to have level volume all over.
I tested the wiper with the ohmmeter. It shorts to ground with the toe down. As you lift the toe the resistance goes up. Is that how it should work?

[MmmPedals]

Ideas anyone? I realized my PS was set to 13V when i plugged it in. i doubt that would fry anything, but could it?

[jkokura]

doubtful.

My first suggestion is to go to the debugging thread and repost following the instructions there. Then I would double check that you didn't ground the unit when you changed the power jack. It might be surprising, but double check that resistor you changed also, because it might be the problem now also.

jacob

[jasperoosthoek]

The pot is OK, that's exactly how it should work. Still since there are caps connecting both sides of the pot you won't measure a short if is on the other side of the cap.

Of course, something completely different can be wrong.

A friend gave me a broken stompbox. His dad installed a cheap DC wallwart of 9 volts or even higher. The unregulated voltage fried the effect. Only the electrolythic caps are very vunerable but still I doubt that. Check the voltage rating of the caps, probably much higher.

Measuring the voltages on the pins of the transistors helps, also probing with a guitar cable to an amp to hear where signal/sound is.

[zombiwoof]

Did you install the new power jack correctly?.  If you have a pedal with an 1/8" jack, you can just buy a $3 adaptor cable to power it with a regular 9 volt adaptor with a Boss-style plug, no need to change out the jack.  1Spot sells it, for one.

To make a wah into a volume pedal, I think all you have to do is remove the 4.7uf electro, did you inadvertantly do something to that cap?.

Al