Interesting patent
 

The group's mascot, cuhulin, posted a link to a very interesting
patent. It purports to be a super quiet switchmode power supply.
http://patft.uspto.gov/netacgi/nph-Parser?
Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2 FPTO
%2Fsrchnum.htm&r=1&f=G&l=50&s1=7,196,892.PN.&OS=PN/7,196,892&RS=PN/
7,196,892
It is a different twist to the standard noise source.

Terry