[sdiy] Transformerless Power Supply

[Jimmy .]

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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