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PSU converted to Lab supply shuts down when anything bigger then a fan is connected? Answered

have converted PSU over and it runs small fans just fine but i try to connect anything larger and it shuts off. how do i figurer out what is causing this to happen?

more: it is a 200w computer PSU trying to power a moblie ham radio max draw 6 amps



I think it's fair to say the PSU is protecting it's self from what it sees as an overload.

Without more information it isn't possible to do more than guess why.


7 years ago

Could it be you're using -12V (usually is a blue wire on PSU) or -5V (usually a white wire) outputs, which are underpowered (0.5 / 0.8 A max)? That would be a good reason for the PSU to shut down to protect itself.

What type, which output(s) are you trying, and what is it that's bigger than a fan?


What kind of PSU ? A PC one ?