slightly OT, need some electronic circuit help

Michael Torrie torriem at
Sun Oct 7 19:57:27 MDT 2012

On 10/07/2012 07:47 PM, Ryan Byrd wrote:
>> Any ideas on how to get negative volts?  I have only one power source...
> 12V positive.  
> Just add another 12v DC power supply and you're good to go. Most op amps have a wide input operating voltages.
> See:

I have only one power supply.  It's called a battery.  I cannot add a
second battery.  This is on a vehicle.

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