Dave,
Check out the Remote Control Web sites for modifying a computer power supply
to provide 12 volts. I've done it numerous times and have attached a copy
of several articles I found on line. The cost is minimal and they are very
clean power supplies. They are available in many different wattages and are
easy to convert.
Just start with a quiet power supply.
Jack
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of Dave C
Sent: Wednesday, December 11, 2013 7:19 PM
To: shop-talk@autox.team.net
Subject: [Shop-talk] Power supply noise?
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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