Converted MiniATX Power Supply

**miw01** · 03-01-2012, 04:41 PM

Originally Posted by rstehle

The tutorial I followed when converting my PS mentioned putting a 10 ohm 10 watt resistor across one of the 5v leads and ground. Keeps a constant load on the PS.

I woluld re-load all rails to test

**Imperialkid** · 03-01-2012, 04:47 PM

Originally Posted by rstehle

The tutorial I followed when converting my PS mentioned putting a 10 ohm 10 watt resistor across one of the 5v leads and ground. Keeps a constant load on the PS.

We must have followed the same tutorial ... same here and they work like a charm. Its an extremely easy mod, plus I got 6 free ATXs ... makes this pretty hard to beat.

EDIT: Here is the tutorial I used. Another member on here, can't remember who, recommended this one to me.

**imbluenote** · 03-02-2012, 09:28 AM

Originally Posted by Wayne J

Using the -12 and the +3.3 should do that.

I played around with this last night and i did finally get it to work (after causing the PSU to shut down a few times). I jumpered a resistor between -12V and +3.3V and between Ground and -12V and tested the voltages. I was a little surpirsed/curious though at where i measured the +15V at, it was on the resistor between the -12V and +3.3V posts. It has been a while since the DC circuits course that i had, but help me understand why it wouldn't have been +15 on either post to Ground?

**budude** · 03-02-2012, 02:00 PM

Voltage is a difference of electrical potential so if you have one point at -12 and the other at +3.3 then the difference between them is what you would measure - or 15.3v (give or take). If you measure to ground from either supply you would naturally measure the difference between -12 and 0 or 3.3 and 0.

**imbluenote** · 03-02-2012, 02:36 PM

Originally Posted by budude

Voltage is a difference of electrical potential so if you have one point at -12 and the other at +3.3 then the difference between them is what you would measure - or 15.3v (give or take). If you measure to ground from either supply you would naturally measure the difference between -12 and 0 or 3.3 and 0.

Got it! Thanks.