Quote:
Originally Posted by asid61
You should assume 5v for all your calculations, because that's your maximum voltage.
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The schematic should be wired such that the LED is always fed from the 3.3v rail, but the transistor base is fed by either 5v or 3v from the encoder. Unless that's not how electronics works, which is highly likely considering my background in electrical engineering consists of connecting red to red/black to black and V=I*R.