Pico PSU quick modification

Posted by crimsonpisang on   1 comments   0 trackback

These little ATX power supplies could be bought off from Ebay cheaply. Its build quality wasn't that bad. It works fine on my old Intel Core2 system. However, I don't like the fact that it uses a single AWG20 wire to on the 12V-ATX connector. There's no way it could safely powered a 65w or 5 amps CPU.


PicoPSU.jpg


What I thought of is simply to create an adapter board. The board would solely handles the switching of the 12V rail while pass through the other voltage rails. I've chosen a double sided stripboard as it has nice wide copper tracks. STF12PF06 P-channel mosfet 60V, 0.18 Ω, 12A for the 12V rail.


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The board takes 12v input from a 6pin molex connector since the the 12V rail alone can supply up to 12A of current. The capacitor was pretty much an afterthought.
Rear side of the adapter.

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I've also added some copper sheet to add more area for the ground plane.
Front side of the adapter

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System working as it should with additional improvements.

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