[sdiy] +/- 15v from a wall wart...

[Justin Owen]

Hey all,

I'm looking for some cheap, simple ways of getting a +/-15 volt supply from a wall wart for a small, portable unit I'm working on.

Has anyone got any advice on the suitability of dual output DC-DC converters like these:

http://www.rapidonline.com/Electrical-Power/Power-Supplies/DC-DC-Converter-ICs/1W-Dual-output-DC-to-DC-converters/72607

Fluctuation from an unregulated DC adapter might be a problem - guess I could back them up with 78XX Vregs?

I know there's a few good schematics out there for supplies running off an AC adapter - but so far I've not had much luck tracking down a cheap 15-18v AC wall wart in the UK - any clues?

Basically I really want to move up to some designs that require a bipolar supply - but I also need the units to be portable and useable with easily accessible power supplies/adapters. Not necessarily after a 'perfect' solution just yet - a reasonably workable one would suffice for the time being.

Thanks much.

J