Variabele power supply in series

Thread Starter


Joined Feb 21, 2018
Would it make a difference if I put, first the variable power supply and second a not variable power supply in series than the other way around (first not variable PSU and then variable PSU)? What would be preferred of not?


Joined Nov 29, 2011
If they are transformer based AND the negative terminal is NOT connected to earth ground, then "yes"!

It doesn't make any difference the order of the supplies.


Joined Sep 17, 2013
If both supplies had the same common (e.g. mains neutral or ground), connecting the two supplies in series would short out one supply.
Depends on the power supply, Suppose the supplies were 1000 V 0.1A. My crystal ball is broken.
Proably not. Suppose they are 12 v 10A; Maybe. Suppose they are ATX supplies - NO!

There is a specification on how far you can float instruments from ground. $1000V is probably too much. ATX power supply have the negative 12 connected to chassis ground. So no.