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Originally Posted by Groth
-12 was used by ISA sound cards, don't know of anything that still uses it. -5 is still used by serial ports.
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so for a new system to have in a car all you would realy need is 17 volts, +12 to -5
and if you don't need the cerial port all you would need is 15.3 volts, +12 to -3.3