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Conversion of resistance based Adjustable Switching Power Supply to PWM based

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james_s:
Well something you could try if you really want to modify an existing pot controlled power supply is to replace the pot with a LDR stuck to an LED. There are commercially made analog opto isolators used for audio applications but it's not hard to make one yourself. The LED can easily be controlled by PWM and this will vary the resistance of the LDR. It may not be very linear but that can be corrected in software.

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