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PC ATX power supply conversion

PC ATX power supply conversion

Old 04-27-2007, 04:15 PM
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Default 11 amps

will 11 amps run an ice charger
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Old 04-27-2007, 04:56 PM
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will 11 amps run an ice charger
Yes, with no problem.
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Old 04-27-2007, 07:36 PM
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You use resistors on the 5V line to boost the voltage output on the 12v line (I know it sounds confusing but that's how it works)

Because you are using a resistor between the +5v and ground wires, the less resistance in the resistor, then the closer it is to a short circuit, therefore the more load - which increases the voltage on the 12v line.

In other words to boost the voltage on the 12v line use a lower ohm resistor ie: go from 10ohms to 5 ohms etc.

Just remember that as the load increases, so does the heat generated by the resistor. Those little white block resistors may not handle the heat.

My power supply runs a 0.2 ohm 50watt heatsink encased resistor with a fan blowing on it. It will run 2 chargers plus a lathe plus run-in a motor at low voltage and the 12v line doesn't drop below 12.25v under load.

BTW there are already heaps of threads about these conversions - try using the search function
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Old 04-27-2007, 08:06 PM
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I've noticed that I have to have load connected to my powersupply before I turn it on...

If you hook anything upto it while it's turned on it switches off
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Old 05-02-2007, 01:22 AM
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i have a problem, lets see if anyone knows. I have connected everything up right (in fact i am getting over 12v under load), but I can not turn off the power supply with my on/off switch. I have to poll the power cable out to turn off. if I plug back in, with the switch off, the power supply will turn on, but no PWR_OK led comes on. But everything still gets power both 12v and 5v.

The switch work the first time to turn it on. and PWR_OK went one. Charge the a battery then go to turn off. no luck.

Anyone now what my problem is?

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