slightly OT, need some electronic circuit help

[Michael Torrie]

On 10/07/2012 08:39 PM, Ryan Byrd wrote:
>> I have only one power supply.  It's called a battery.  I cannot add a
>> second battery.  This is on a vehicle.
> 
> well... you could get a dc-dc converter that takes 12v in and outputs
> 24v, like this http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_155695_-1
> then, with 24v you could use a pair of resistors in a voltage divider
> circuit to get +/- 12v: http://en.wikipedia.org/wiki/Voltage_divider

That may work... though the current rating is rather low.

> Another option is to use an 12->120v inverter and then use a computer
> power supply. ATX, for example, has +/- 12 volt outputs:
> http://jwenet.net/notebook/2005/1161.html

Hmm, sounds complicated.

Will give it some thought.