[Elecraft] MFJ-4125 Fan Noise

[n1al at cds1.net]

My solution was just to put the power supply under the operating desk
instead of on it.  That reduces the noise considerably.

Al N1AL


> Question for the List:
>
> I recently bought an MFJ-4125 switching power supply to use with my K3/100
> transceiver. While otherwise satisfactory, the MFJ-4125 has an
> objectionably-
> noisy fan.
>
> On my MFJ-4125, over half of the fan exhaust openings on the back of the
> supply are blocked by the fan's motor housing, which makes me believe that
> the
> power supply originally was designed for a different fan (perhaps a
> quieter one),
> and this fan is an expedient substitute by MFJ.
>
> I would like to know if other users also are bothered by the MFJ-4125's
> fan
> noise, and what they have done about it.
>
> Have you substituted a quieter fan? Have you installed a series resistor
> to slow
> down the fan, and with what result? Have you installed a thermostatic
> switch to
> run the fan only when needed? Or have you given up and simply bought a
> quieter power supply?
>
> Any advice would be appreciated.
>
> 73,
> John, no8v
>
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