[sdiy] Transformerless Power Supply

[Ken Stone]

Switchmode PSU. It would use a transformer, but one running at some
outrageous frequency. The would, however, be no MAINS transformer.

Ken


>I've built some analog guitar pedals that I plan on mounting behind a common 
>2u rack panel instead of in individual stomp box cases.  I figure just 
>buying a 9v power supply will be cheaper and easier than building one and I 
>ran across this:
>
>http://www.musiciansfriend.com/srs7/g=home/search/detail/base_pid/155051/
>
>It claims to be a "Low-noise transformerless design" and immune to 60hz 
>hum.. how does something like this work without a transformer?  Is this a 
>waste of $40?  I've got some 9v wallwarts lying around.. is it safe to daisy 
>chain a few guitar fx circuits off one of these?
>
>-Jimmy
>
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_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>