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Homemade Bench top Power Supply

Filed under: Linux Hardware,The Linux Blog News — at 1:06 am on Tuesday, March 31, 2009

Homemade Bench Top Power Supply

I’ve always had an interest for electronics and recently I’ve been exploring my interests more. Last week I sorted through my tub of parts and placed them in individual draws. It took a good while to sort everything but I think it was worth it. I’ve seen power supplies built from PC power supplies before so I thought I’d build one my self. Thing is, I never really got around to it.

Yesterday I was feeling rather ambitious and decided to make a bench top power supply for small electronics. All the sites I found I have lost, so I kind of made it up as I went along. Most of them used ATX power supplies that are readily available, but I opted for the easy way out and used an AT with a hard on/off switch. At first this was the only reason I used it, but there are more advantages to using a AT over an ATX power supply for an external power supply. Firstly, it was cheap, well free actually. I took it from a PC that I had modified some time ago. I have a box full of AT power supplies in storage that I’ll get to some time and replace it. But I won’t be using the PC it came out of for a while, mostly because I have toaster ovens that are faster. Another reason it is better than a ATX is it has less voltages. The only voltages listed are 12v, 5v, -5v (7v) and GND. They vary in amps but are sufficient for what I will be using it for. It made it easy not to screw it up since there wasn’t many wires.

To make it was really easy. I took the top off. Drilled 4 holes in the case and inserted the insulated terminal, checking to make sure they didn’t ground out on the case. Cut most of the cables, leaving a couple of molex’s hanging out just in case I need them. I then soldered the remaining wires to a terminal by voltage (Yellow +12, Red +5, Red +/-5, Black GND.) It might not be the prettiest of them all, but I think it will do its job well.