Here's an old idea, that may be worth repeating:
If you want to run a muffin fan at a slower speed, to reduce noise and
of course lower the air throughput, put a paper capacitor in series with
one side of the AC supply.
Recently, my Son-in-Law wanted to cool his stereo amp
and I used a 2 Mfd 200 volt paper capacitor to slow the fan down. This value
resulted in about 62 volts feeding the fan and it run's just fine at that voltage.
Other capacitor values will result in different voltages which will create
different speed's of the fan
John J. Riddell, VE3AMZ
451 Cedarcliffe Dr.,
Waterloo, Ontario, Canada
N2K 2J1
And you can mount a Klixon thermostat on the hottest part of the
heat sink and short out the cap to go to full speed.
Mike WA6ILQ
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