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More stable than MK's, but using fewer diodes (substituting LEDs in many places might be more robust and easier to tell in real life than in the shaft? It can be replaced by an op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV We could also do all-different colors, but unfortunately Mouser only has A1Ms in orange. *** Expensive, about $3 each. *** Replacing LEDs in these is supposed to be more robust and easier.

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