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on a 185w max computer atx, what would be the best resitor to use? (for lab power) Answered

i have a 185w max output computer atx, i have wired it up and followed directions. but im not sure of what resitor to use. also when i plug it up it comes on, but then when i put a load on it (like red to black) it shuts down and i have to reset. still works, just need to know what im not doing right

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omnibot

Best Answer 9 years ago

I have the same problem with mine. My solution is a 10 Watt 4 Ohm resistor from a microwave connected in series at the positive. You could probably get away with a lower watt and I've had coils and things on it with no trouble at 2 Ohm. Another trick I use is an old cpu-fan connected as a load on 5v to get it to turn on before I apply the voltage. You may wish to make a permanent connection in wich case I recommend a resistor able to take the load if needed.

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AndyGadget

9 years ago

If you're connecting red to black you're short-circuiting the 5V rail - not a good idea. As you've noticed, it shuts down.
If there is a green wire, you may need to connect it to one of the black ones to make it work properly.
If you use the Instructable search engine you'll find a veritable plethora of ATX bench power supply projects.

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jshppsAndyGadget

Answer 9 years ago

i have connected the green wire to the black one, and it does come on. but if i put a bulb or something on it, it cuts off. how would i get it to stay on without short'n it out. so i could use it in hho experiments.

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lemonie

9 years ago

What are you trying to do with this thing? What load are you connecting? L