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Old 12-04-2010, 06:39 AM #17
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Default Re: 12v 5v power supply

You can find really cheap PC power supplies with nice current ratings. I have one I converted over and use it for the 12V side on a 20A device and it works great. You cant buy a stand alone 12V 25A supply for anything close to the price of a cheap PC supply. I imagine they recommend such a higher wattage resistor because the fact most people use these things for long periods of time and obviously a higher rated resistor will last longer against the heat. I cant remember what resistor/resistor combo I'm using but 20W comes to mind and even it gets toasty.


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Old 12-04-2010, 03:10 PM #18
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Default Re: 12v 5v power supply

The power rating of a resistor is the power it can withstand indefinitely. If a resistor is rated for 1/4W, you can run it at 1/4W. Resistors can run hotter than silicon devices and heat has less impact on lifespan.
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Old 12-04-2010, 03:28 PM #19
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Default Re: 12v 5v power supply

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Originally Posted by Bogart View Post
It's always worked fine for me, and has never shut off the PC.
Thats because its under a load.

Some PSUs are 'switching' units, which means you need to keep a load on it to keep it going. Older ones are usually not, so you wouldn't need a load.
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