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I built two combo pedals which include Mini-Me Chorus. The first one worked great, the second one isn’t working. There’s no wet signal and the Q3 transistor is getting blazing hot so I think there is a drain somewhere but can’t find it. I installed a vibrato mod using a 1 meg pot inline with R15. I’m getting dry signal which to me means IC1 is working as are in/out, power/ground. I have G2 grounded as well. I’ve swapped all of the ICs with fresh just to make sure it’s not a bad IC. Checked diode and transistor direction, and solder joints. TR1 is at about noon. I’m using the V3207 IC and checked direction of the jumpers are correct. I pulled it out of the combo pedal and wired up as a simple jack and battery setup to confirm the issue isn’t coming from other circuits or switches in the combo pedal.
Any advice would be appreciated.
They aren’t, but soldered them with a standoff so a good gap between them and the board. The tell is the hot transistor I think. It’s like burnt my finger hot.
You must have a dead short if Q3s getting really hot check you don’t have continuity from Q3 collector to ground also check the transistor socket for continuity
SOLVED! It was a bad IC. I cleaned the board so there was chance of a flux short. Did some MM testing against my known working build and couldn’t find any tells. I had swapped out the ICs once already but apparently have more than one bad chip. I’ll have to do some testing for which one, my suspicion is eighter the 3207 of the oscillator. Op amps seems to be working fine cause I was getting clean signal. This is why I continue to use IC and transistor sockets! Going forward I’ll also test ICs before installing. Thanks for the help.
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