Hello, I was wondering how would you make a negative voltage source from one battery? I have currently, on hand, several +12v regulators and 2 -12v regulators; since the -12v regulators take in a negative voltage source they are useless to me. Would you make a something like a voltage divider with the output being '0' and designating that as the ground? Thank you.
There are some ICs that take a positive input and convert it to negative. The LT1054 is one example. How much current do you need? What negative voltage do you need? What positive voltage do you have? EDIT: I just remembered that if you don't need good regulation and need only a few milliamps or less, you can build a voltage inverter using a 555, some resistors and capacitors, and a few diodes. Much easier than trying to find a special voltage inverter IC.
Thank you for the reply. I would need a +12v source and a -12v source at approx. 100mA each. The power supply would just need to be fed into op-amps so I think about 10% dilation would be tolerable.
Could you manage with +6 0 -6? The PS circuit shown here might do. The 2 capacitors will stabilise the potential divider around the virtual earth. For your 100mA drain I'd make the capacitors a lot bigger.
