[sdiy] getting +/- 12V from a 9V source

[pfperry at melbpc.org.au]

Nils <np at inverse-entertainment.de> wrote:
> Now there is a problem with the power supply. I want to drive a +/- 12V
> circuit from a 9V wallpart (because they are so cheap and common). I don't
> feel like building a full blown +/- 12V supply just for a preamp.

!!!!I can assure you that by the time you futz around with ".. a wien-bridge sine oscillator, a fat tranny as a driver and the output through two little transformers. Then add a rectifier, some caps and> a 7912/7812 pair." you will be wishing you had just got an  AC plugpack & done the usual!
Quite apart from the expense, and sourcing the components, your upconverter will likey leak interference into everything & make the whole project pointless, especially for a preamp.
Don't bother using those single chip voltage doubler/inverter things either. Really!

paul perry (cheap & lazy, but I think RIGHT, this time!)


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