24 dc to 12 dc bipolar power question

[9 volts]

Hello, I've got a 24 volt dc power supply and I need to get from it 12 volts bipolar. I understand how to do it with 24 ac and have looked at the possibility of  7660 ic but this only goes up to 10 volts. Can anyone point me in the right direction? Thanks

[Thomeeque]

Hello, I've got a 24 volt dc power supply and I need to get from it 12 volts bipolar.

And what current? What do you plan to feed with it? For very small currents (up to 10mA?) you could try to use simple 2-resistor voltage divider with some filtering caps.. For higher currents would be IMO most effective to build/get another PSU.. T.

[9 volts]

Low current,  voltage divider looks like it would work, but my maths isn't so good- looking at R.g.Keens schematic for the splitter a/b/y would simply using capacitors to ground result in bipolar 12volt? Thanks

[cpm]

you can use an opamp to buffer and sink a virtual ground at 1/2 V

[Thomeeque]

you can use an opamp to buffer and sink a virtual ground at 1/2 V

Yep, definitely, how could I forgot about this option! You can even use more op-amps in parallel (with outputs connected together by some small value resistors, like 10R) to make it stronger. Or you can use some cheap power-amp IC..

Low current,  voltage divider looks like it would work, but my maths isn't so good- looking at R.g.Keens schematic for the splitter a/b/y would simply using capacitors to ground result in bipolar 12volt? Thanks

Which schem do you mean exactly? Is it what you plan to feed with it?

T.

[9 volts]

The schematic is called 'splitter a/b/y' at geo, not what I'm planning to build just looking at the way the batteries are used to create bipolar dc. I did a quick op amp google search. Is using an op amp as a buffer, would I use a buffer on the + and - sides? If you can point me to a schematic, example or site it'd be greatly appreciated.
Thanks again

[cpm]

http://tangentsoft.net/elec/vgrounds.html

[caress]

LM7812?

[TELEFUNKON]

TLE2426 ?  http://www.diystompboxes.com/smfforum/index.php?topic=19088.0

[Minion]

Look for a 12v AC Adapter and make a Voltage doubler and a couple regulators to get +/-12v DC .......

[9 volts]

Many thanks, the link is great and has got me on the right track.