it is possible as long as both output terminals are isolated from the line
ground (and case preferably for safety!). many dc supplies connect the
negative to the case and line ground so if you tried to put them in series
you would short one of them out through the other one's ground.

"Richard" wrote in message
news:teAbe.436$3V3.55@edtnps89...
Can someone tell me if it is possible to hook up two 12 Volt DC power
supplies in series to increase the voltage, I have two supplies that I
would
like to do that with , one being a variable supply. I need About 25 volts
total.
Any info on this is greatly appreciated.

Richard