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dc-dc atx power supply question

I have two of these R100D1205-12TS

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I want to use it to run a computer on a car battery. Its a 100 Watt, so I think I can do it. I'll use the first one to power the motherboard and the second one to power the hard drive.

My 2 questins are:

1) Can I just use a resistor to step down the voltage?

2) Do you think I could get away with just using one to power the hard drive and the motherboard?

I realize I have some reading ahead of me to learn som of these basic electronics. Thanks for any advice you can give me.

Reply to
the yeti
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Going from 5V to 3.3V using a resistor will waste about 35% of the available power. At 5A, the resistor will dissipate something like

8.5W, so it'll get hot. A little SMPS would be better, although more complex.

This depends on the current draw of the mainboard and drive. If you are using an EPIA nano-itx mainboard, you might be able to get away with it.

Why not use a laptop, and charge the battery directly?

Regards, Bob Monsen

Reply to
Robert C Monsen

have a look on the via epia motherboard site - they have a mini-itx motherboard that's specifically designed to run off a single 12V supply only, with onboard DC-DC converters. Also see

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for other stuff like this.

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Reply to
andy

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