power supply

rwarre · #1 12-07-2008, 08:15 AM

I have a bench power supply from Radio Shack that puts out 13.7 volts. I want to use this for power to test instruments etc. Should I try to reduce the voltage down to 12 volts or will the 13 volts damage anything? How would anyone suggest installing a potentiometer on the power supply. Thanks.

TX7A · #2 12-07-2008, 08:26 AM

I had a similar question to yours on this post:
http://www.vansairforce.com/communit...ad.php?t=23413

You'll need to know its amp rating before you plug anything up to it. The power supply I have is for electronics bench testing, but I'm using a battery instead. I just didn't want to take any chances.

Dan Langhout · #3 12-07-2008, 08:30 AM

Your system voltage when the engine is running and the alternator is doing it's thing will be about 13.7 or above - so your PS output is really closer to the real environment your instruments will see.

Ironflight · #4 12-07-2008, 09:07 AM

When I started my build, I had a little 12 volt (which puts out 13.7) power supply on my bench that maxed out at about 7 amps. Once I got more stuff installed in teh panel, it blew the fuse all the time - that's when I bought my 55 Amp Daimond bench power supply, and that serves as external power whenever I need it in the shop.

Paul