Simple bi-polar PS from car battery

[L'ESPERANCE]

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]

The simplest thing is an off-the-shelf DC-Dc converter like this:
https://uk.rs-online.com/web/p/isolated-dc-dc-converters/1670917/

You can also get dual output 12-0-12 types with an equally wide input range if you need a stabilised +12 as well; a car electrical system can be anything from 10V to 15V, with spikes in excess of 60V...

eg. https://uk.rs-online.com/web/p/isolated-dc-dc-converters/1675953/

Use a simple filter on the power in to protect from spikes and noise.

 

[Willen]

A car electrical system can be anything from 10V to 15V, with spikes in excess of 60V...

Same with motorcycle electrical system?

 

[rjenkinsgb]

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

 

[crutschow]

Same with motorcycle electrical system?

Yes