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Old 4th March 2005, 05:36 AM   #1
neutron7 is offline neutron7  Canada
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Default PSU sharing grounds

I have 2 switching type power supplies, one is 12V 12.5A and the other is 5V 10A

i want to use them together to power a small motherboard which only requires 12 and 5 volts. it is for a small totally fanless PC

i was thinking of just powering them up and making sure there is no voltage differential between the 2 grounds before connecting them together is that enough to make sure it is safe? otherwise i could use a regulator off the 12V one, but i would prefer not to.
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Old 4th March 2005, 06:26 AM   #2
Ivo_Hristev is offline Ivo_Hristev  Bulgaria
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Hi neutron,
Try measuring the resistance between the two grounds.
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Old 5th March 2005, 12:23 AM   #3
BlackDog is offline BlackDog  New Zealand
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Originally posted by Ivo_Hristev
Hi neutron,
Try measuring the resistance between the two grounds.

That normally works just fine.

When I do this, I usually connect a 10ohm resistor (to limit the current) between the two and measure the current flowing.

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