I don't have a DC power supply to use, so I made one out of a 9.6v NiCad battery pack from a remote control car. I can supply up to about 9v and is of course rechargable and I don't have to worry too much about short circuits.
It uses an LM317 adjustable voltage regulator and a potentiometer to select the voltage. There are two led indicators and two switches. The first switch turns the input on. At this point, you can change the voltage with the potentiometer (monitoring with a mulitmeter). The second switch turns the output on so you can adjust the voltage without powering anything else. The second indicator light is for the output circuit.
I wrapped up the battery pack's cord nicely, put the power supply circuit on a small breadboard and it's all held together with wire ties. It's pretty ghetto, but hey, it cost about $1 (the price of the LM317 at radio shack).
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