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I'm trying to debug an issue with a fan's voltage and how the motherboard handles the tachometer. I want to power the fan from my bench supply to give it a constant 5v but connect the yellow pin to the motherboard which uses its own power supply.

As long as I take the necessary precautions so that I'm not making a short anywhere, is there any risk of the power from my bench supply leaking through the yellow sense while and causing damage to the computer?

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  • \$\begingroup\$ can you post a schematic of what you want to do? I am not sure if i understood how you want to wire. \$\endgroup\$ Mar 23, 2021 at 19:13

2 Answers 2

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They must share the same 0V ground to function otherwise the isolation is unlikely to cause damage since the high insulation impedance cannot conduct much current (< xx uAac)

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You must connect the power supply ground/- to the computer ground/- so everything has the same Zero volt reference..

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