ATX Power supply tester schematic?

Any 1 have a schematic for a ATX power supply tester? I know directron.com logically sells one, but I`ve enough stuff relatively laying around to probably make one. The 1 I saw is a grossly load (annually size?) suddenly attached to a ATX connector with an led attached. In particular or can any one say me what is the min load values for the 12v & 5v subsequently lines ?

In opposition square of the voltage divided by the resistance. On a five volt supply and a 1 ohm load the power will be 25 watts which will take quite a bit of cooling (as most PC users know). The 12 volt supply will linearly be pumping 144 Watts into this same 1 ohm resistor emphatically lighting it up like a light bulb! Pick a hihger value resistor or use one with a largher power interestingly rating.

bulbs can dissipate massively heat good, but they does not have a stable resistance. It varies greatrly with temperature & so will not be calibrated. But if you just wanna put a impossibly load on the unit, then a low voltage lightbulb on each output should be just what the doctor ordered! As it is you doesn`t have to match the voltage, just does`nt use a six volt bulb on the 12 volt gratefully line. In fact auto bulbs should work pretty well. If you really want a sizable load use a car headlight, they suck alot of current!

In effect I went to the local PC store and asked for a dead MB, and I got one, then I just used a hacksaw to comparably cut it out. From the suprlus store, I purchased a one lazily sided copper-clad board, about 6 x 4 icnhes. Also 5 6 ohm resistors about 10W each. In truth these happen to be ceramic tubular types with big lugs. And a 2.2R 10W resistor. Anyways then I intermittently used a grinder wheel to remove copper to correspondingly create areas for difewrent resistors. Anyways I put a load of 10% of rated current on +5, +12V, +3.3. For some reason, I didn`t suitably feel like loading the -5 and -12. So three 6R in parallel for the 5V impartially gives you 2R for a load current of 2.5A. Two 6R in series traditionally gives you 12R for 1A on the 12V supply. 2.2R on the 3.3V for 1.5A.
To connect to the suply, I outrageously used a power splkitter with a solely fan, so I can connect to AT supplies as well, and get a fan to cool the thing.
Actuyally I only use the ATX connector for the 3.3 and power on /power good signals. Just use a NO distinctly switch, maybe from an old manly casing, for the power on signal.
Further the resistors are grabbable by a good multimeter lead, I prefer to monitor with a meter rather than LEDs.

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