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Orange. * Expensive, about $3 each. Replacing LEDs in sliders, lit for each stage? * TBD, needs testing; but if LEDs are possible, this should be the same, see datasheet: https://www.mouser.com/datasheet/2/54/PTL-777483.pdf (page 4) if we want its recipients to know that what they do J175 jfet (~50¢) and H11F1M ($5!) optocoupler, otherwise basic jellybeans .

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