Computer supplys for charger power question

[BrianG]

If hat brown wire is a feedback wire, it's for the 3.3v line, which won't do much for the 12v line unfortunately.

And yes, it's pretty common for the voltages to be a bit under/over their values. IIRC, the ATX spec allows for +/- 5%.

The only thing I could say is to load the 5v line and see what it does, and/or open her up and see if there is a pot in there you can fiddle with.

Oh, and if you do end up loading the 5v line, make sure the power rating of the resistor is at least 4x the power needed because it will get quite hot otherwise. If you do load it with 1A, that means you'll need a 5 ohm resistor rated for 20w (or two 10 ohms in parallel, each rated for 10w).

[J57ltr]

I did find a pot, it's gooped up but nothing I can't adjust. It's really tight in this supply I am going to have to mount the terminals and switch on the outside. this thing has a 120mm fan on it. I was thinking of moving it to the outside but I can route the wires cleaner on the outside.

The reason I wanted to raise it to 12V is if I am charging at around 6 amps the input voltage sags to about 11.2. The old supply was 14A. This one is 15A so they are about the same.

Do you think that only having a .5W load is enough for the +5V supply or should I bring it up to 1A?

Thanks for the info, I'll pick up some different resistors tomorrow.

Jeff