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  • an LED glued to the face of an LDR converts voltage to resistance, but a digital pot would be simpler to calibrate. I'm using a MCP41010 with the 334, which works very well and cost me ~1ドルus Commented Mar 5, 2017 at 12:50
  • an LM317 can provide 0-2ma CC with common 1/4watt resistors, look at the datasheet. Commented Mar 5, 2017 at 13:48
  • On Arduino, PWM stands for Pulse Width Modulation, not "Phase Width Modulation" Commented Mar 5, 2017 at 21:47

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