- Joined Nov 12, 2009
I'm experiencing a problem with the gain potentiometer on a guitar overdrive circuit i've just wired up. When I turn the gain up, the gain increases as it should until around 3-4 oclock, where the gain then disappears as if the throw is starting over again but at the end of the turn. The pot used is a dual gang 100K linear, and i've been told that both pots need to be measured on or very near 100K or in the least have both pots close in value if not. The best pots I had out of my batch to replace the troubled one used measured at 93K at the top and 100.2K at the bottom, and another pot measuring at 93.6 K at the top and 96.8K at the bottom, I used the latter. When I wired it up, it was still giving me trouble and I now want to try the 93K/100.2K pot instead and try to bring up the value on the 93K pot up to 100K to see if that'll do the trick. I have very little experience in electronics but figured it'd be as easy as putting a 7K resistor across the lugs, but when measuring it seemed to bring down the value drastically. Does anyone know of what value of resistor I should use to get that top pot up to snuff?