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How would I wire together 3 bench power supplies to get potential differences of +12, +24 and -6V, all with respect to the same 0V? All 3 of the bench power supplies have positive, negative and ground terminals.

I've looked online and cannot find something similar, which I find surprising. If anyone could point me in the direction of any resources that can help me I would much appreciate it.

Thanks, Steve

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  • \$\begingroup\$ Are you asking how to have three separate supplies with those voltages? If so, then why not use a SP3T switch? \$\endgroup\$ – KingDuken Oct 15 '18 at 17:40
  • \$\begingroup\$ Are the power supplies isolated? I would expect so, but you have to be sure. Do you have make and model numbers for them? \$\endgroup\$ – Andrew Morton Oct 15 '18 at 17:51
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If they are isolated PSUs, then you can set each one to the required voltages and connect them together. The two positive ones have their "negative" outputs connected together to be the 0 V rail, and the supply for the negative voltage has its positive output connected to the 0 V rail:

enter image description here

If there will be high currents between, say, -6 V and +12 V then there may be other considerations: please add a comment if that is the case.

Also, and a bit out of the scope of what you're doing, power supplies have a maximum rating which limits how much voltage you can create by putting them in series - you could not put a thousand 30 V PSUs in series to create a 30 kV supply. [The name of that rating escapes me - perhaps someone would be so kind as to add a comment with its name.]

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