Using ATX PSU to get voltages in between 3.3, 5v and 12v for 7v, 8.7v & 1.7v

Thread Starter

RogueRose

Joined Oct 10, 2014
375
I read somewhere that I could use the 5v rail and the 12v rail to get a 7v supply. I tried connecting my motor to the 12v & 5v supplies and nothing happened. I tried switching the connections on the motor to see if it was polarity, but it wasn't. Is what I'm trying to do possible and if so what do I have to do to get this working?
 

paulktreg

Joined Jun 2, 2008
833
The 0V rails are already all tied together.

Have you switched the power supply on by shorting the green wire on the 20 (might be 24) pin connector to 0V?

If this doesn't do it the power supply may need a load. An HDD or two would do.
 

Thread Starter

RogueRose

Joined Oct 10, 2014
375
The 0V rails are already all tied together.

Have you switched the power supply on by shorting the green wire on the 20 (might be 24) pin connector to 0V?

If this doesn't do it the power supply may need a load. An HDD or two would do.

IDK, it is working with regular 12, 5 and 3.3 rails, just not when I use "non-standard" rails like 12 & 5v together.. I'll try running something on the 12v & ground adn then also trying something with the 12v & 5v together.
 
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