[Shop-talk] Power supply noise?

[Dave C]

I just got a mobile (as in normally installed in a car or truck) uhf/vhf 
ham radio to use as my base station.  Since it's a mobile I had to get 
a  12 volt power supply.  I got a (relatively) inexpensive 25 amp 
switching power supply from the same vendor.  The fan is really noisy 
and runs all the time.  No I haven't called the vendor yet, and my wife 
threw away some of the packaging material anyway.  So, any ideas on how 
to quiet it down?  I have already moved it to the floor under the radio 
bench, but I was thinking of trying to find some kind of thermal switch 
I could add to the fan circuit, or maybe just opening up the enclosure 
and disabling the fan, or putting a manual switch on it.  Also thought 
of building a larger enclosure around it which would still provide air 
movement, but would block most of the noise.

Any ideas?

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