Power Supply Questions

[Harry Bissell]

How much current do you need ???  Do you have regulated +- 12 Volts now (or
just unregulated ???) How well regulated should the bipolar 9V be ???

If you put 4 diodes in series... the voltage drop is around 2.8 volts... so
you could hook
them up like this

+12V-------->|------>|------>|------->|------+9V

-12V---------|<------|<------|<--------|<------ -9V

Dont forget some caps on the 9V side.
Crude yes... effective yes.... cheap very!!!!

Need a little less... use 5 diodes...  (1N4002 or higher voltage OK)

Enjoy

Rob Rickner wrote:

> Does anybody know an easy scematic that would create a bipolar 9vDC from
> a 12vAC wallwart, I have a 12vDC Bipolar that runs off this wall wart, I
> have plenty of amperage to spare (800ma should be enough for simple
> stuff right?) and I'd like to run some circuits at a different voltage.
> Could anyone help?
> Rob Rickner/Cut Generic