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

[Scott Gravenhorst]

Hi Justin,

The PAiA FatMan power supply is an 18 volt (I think) AC wallwart that feeds two diodes and some
electrolytic caps.  They made -12v +8v and +5v, all regulated.  The schematic is on their site
http://www.paia.com/  You can get the voltages you need by changing the regulators.  This is a half
wave rectifier solution, so the caps have to be bigger than with a bridge and center tapped
transformer.

Justin Owen <juzowen at googlemail.com> wrote:
>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
>
>
>
>
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-- ScottG

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-- Scott Gravenhorst
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