[sdiy] wall wart confusion

[Aleks Clark]

IIRC, voltage is a matter of potential, and so long as your wall wart is of
the big heavy variety, ie, uses a transformer instead of being a switched
power supply, you could just use an 18v or 2x9v's the same way as you would
2 9v batteries. But test before you hook it to anything important :D

On 2/27/06, amokan <amokan at gmail.com> wrote:
>
> I didn't pay attention back in high school electronics when it came to
> power supplies so please forgive me if this is a newbie question...
>
> I've built bipolar supply kits for modular use but never really understood
> _how_ they work. Negative supplies are a mystery to me. I know there is a
> difference between ground and the negative rail, but I don't know what the
> difference is. A 9v battery is in-fact bipolar, yes?
>
> Long story short, I'm working on modules that will run in a stomp box
> format and I'm trying to figure out the cheapest & easiest way to power
> them. I know I could use the dual 9v battery solution to power them
> (assuming the circuits could run at 9v) but I'd really like to just use a
> standard 9v or 12v dc wallwart that I have laying around the house. How do I
> get a negative voltage off of a standard 12v wall wart? Is it already there
> normally, or just a positive and a ground?
>
> Sorry for rambling. If there is a web resource explaining this, please let
> me know.
>
> Thanks!
>



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