2x single rail PSU to make a dual rail PSU.

[@rt]

Hi Guys
Any problem with that?
Basically to use a pair of identical single rail variable bench supplies plugged into the same mains
with their output grounds tied together to provide a dual rail output?
I can’t think of a problem, but maybe I’m not considering something.
Cheers!

[jeroen79]

No problem at all.
Mind that if you tie the grounds (-) together you will have two positive rails.
For a symmetric supply you need to tie one's  + to the other's -.

[tron9000]

• connect negative of supply 1 to positive of supply 2
• the positive of supply 1 will by V+
• the negative of supply 2 will be V-
• the voltage measured between V+ & V-, should be twice the output of each supply
• use the connection made in 1. as your 0V for your circuit.
• measuring from V- to 0V you should see a negative voltage and from V+ to 0V and positive voltage

[@rt]

Dual rail might suggest one supply is negative, I don’t know. In my case both are positive.

Didn’t think there was a problem.
+12V, +5V, 0, for retro computing. A number of computers that have no -12V supply needed, and a distribution block with all the fuses.
It just appears I can go a little higher quality for cheaper if both supplies are single rail.
Cheers