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Simple bi-polar PS from car battery

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L'ESPERANCE

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Anyone know how to make a +12/GND/-12 power supply from the car's 12v battery ?

I need less than a half amp output !

Denis
 

rjenkinsgb

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Willen

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rjenkinsgb

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The basic battery range would be - from low during an electric start or with the battery run down, to 15V while charging from the alternator.

I don't know how bad the noise and spikes would be, but any component rated for "automotive" use is supposed to stand a minimum of 60V from what I remember.
It should only be short transients & switching spikes, most nowhere near that, so a simple filter should keep it down to reasonable levels
 
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