[sdiy] Transformerless Power Supply

[Paul Schreiber]

It's a small switching supply. It *does* use a transformer, but not a 60/50Hz 
one (more like a 250Khz one).

Paul S.

----- Original Message ----- 
From: "Jimmy ." <omgemag at hotmail.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, December 07, 2005 12:08 AM
Subject: [sdiy] Transformerless Power Supply


> 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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