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Thanks to you all, fellows. Well, I must be on the right track after all these years because I have some of everything mentioned.  I have lots of resistors, many LEDs stripped out of camping lights, a couple of "pots", many power sources, a multimeter, and lots of kapton tape.  Like my brain I have used them all only up to a point. I think I will first try just the tape and maybe a full 1K resistor over the 750.  I think the idea of a testing board, Sagit... is very clever, especially testing those scrounged LEDs.
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