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martin88 6th November 2004 08:48 AM

car power supply
Hi all

I dont know if this should go here i wana put a pc in my car and wanted to make a power supply that will run off a standered 1v car battery.

Anone know of any websight that have schematics for this or has anyone here done it

thanks in advance

paulb 6th November 2004 12:17 PM

Here's one. No idea if it actually works.

DigitalJunkie 6th November 2004 12:36 PM

Heres a link to a linear (sorta inefficient) AT PC PSU I built up..nothing fancy,but it's fairly simple,and uses (for the most part) common parts.
(for ATX add a 3.3V reg,and a constant source of +5V)

and a couple more simple inverter circuits,just for kicks..


sss 6th November 2004 01:47 PM

its cheaper to buy a power supply for cars that converts 12v dc to 220v/110v ac

SupraGuy 7th November 2004 12:12 AM


Originally posted by sss
its cheaper to buy a power supply for cars that converts 12v dc to 220v/110v ac
Cheaper, yes, but less efficient.

The only tricky voltages to provide are -5 and -12V. Standard LM7812 and LM7905 ICs will provide a regulated 12V and 5V easily enough. You may need a few of these in parallel in order to provide adequate current, but that's not a big deal. An LM317 could also be used for these, and for the 3.3V supply as well.

Undervoltage protection should be incorporated, in case the battery voltage falls below about 12.5V (Needed to provide 12V from the LM7812) If you prefer other DC-DC circuits can be used which can provide 12V from as little as 5V -- This may be a better idea.

MAXIM IC makes DC-DC converters which can provide the -12 and -5V easily enough. Actually they have standard components to provide all the voltages that you'd need to power a PC from a 5V DC supply of adequate current with excellent efficiency.

Otherwise, you could build your own switchmode supply. You could even respec a standard PC switching supply in the oscillator section to run off of 12-14V at higher current to the transformer. I've also heard of power supplies which can be run from 230VAC, 115VAC, or 12VDC.

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