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Using two power sources to create +/- voltage

Question asked by palumr on Oct 21, 2010
Latest reply on Oct 22, 2010 by Raclegg

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I'm a newbie to power sources, and I'm wondering what the set up is to create positive and negative voltages using two power sources. I have seen the setup before and know it involves connecting a common ground between them, but could anyone please show me a picture or describe the setup? I'm not sure of the model, but I'm talking about the power supplies that have +,gnd,and - connections.

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Raclegg Oct 22, 2010 12:54 PM
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It is pretty straight forward to create a plus and minus voltage using two power supplies. Since each power supply has a floating output there is no restriction on where plus and minus have to go. I have included a picture of the method of hooking up two power supplies to create a plus and minus voltage. The minus output of power supply 1 is attached to the plus output of power supply 2. This point is refered to as the common of the two supplies. It does not have to be hooked up to earth but it can be if that is the requirement for your circuit. If you were to take a DMM and attach the minus of the DMM to the common terminal and the measure the voltage from there to V1 you will measure a positive voltage. If you now measure from common to V2 you will measure a negative voltage.
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Using two power sources to create +/- voltage

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