[R-390] DC Fan Noise

[Gord Hayward]

In an application here, we saw humongous spikes from one of the minuture 
computer fans.
I suspect it had electric comutation.  I put in a pi filter - 2 
electrolytics and a choke.  That
cleaned the spikes a lot.
 73 de Gord, VE3EOS

-- 

Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.