The Matrix all Wired Up
Added 2017-09-28 00:08:41 +0000 UTCWell, I finished all of the soldering and put the knobs on.
But when I went to test it, eight of the pots were bad. HUH? That's an unusually high failure rate. I didn't test them beforehand because, what can go wrong with a brand new potentiometer? I pulled 8 more out of the bag, and checked them, and all test OK. Hard to believe I had 8 duds out of the 20 I installed. Maybe I burned them when I was soldering .. dad-gum it, now I have to pull those out and replace them. Another couple hours hassle.
Comments
They are built on a silicon base, but the resistive strip inside, or the comb, must be more delicate than they used to be. Or I had a bizarre 40% bad batch. I tested signal paths and my soldering seems OK, and all of the summing resistors check out, so it has to be the pots.
2017-09-28 16:13:34 +0000 UTCStill tidy. Pots used to be pretty heat tolerant, made out of fiberglass and bakelite (or something similar). I can't imagine you could cook one, unless they're made completely out of plastic now.
benin81812
2017-09-28 01:23:12 +0000 UTC
