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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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RE: Baffled by a switch mode power supply problem.

Posted by jedrider on March 30, 2021 at 10:21:40:
As the power source says 12 vdc but measures 22 vdc, it appears that the internal power supply actually expects > 12 vdc as a valid input. Usually, you want to feed a regulator about 2 volts over what it is expected to deliver. I'm not an expert, but like you, I have experimented a lot. I notice that some equipment is just very particular to what voltage and amperage you deliver and just doesn't operate at any lower voltage or amperage.