The best and easiest way to reduce fan noise is to place several
dimple diodes in the 13.8v line going to the 12v fan.
Use diodes such as 1N4007 (or anything similar). You get about
0.6 to 0.7 volt drop for each diode in the string. Just a couple
of volts less to the fan reduces noise noticably.
73
Rick
(Assuming it's a 12 v fan of course - I can'y remember and I
don't have my Centaur anymore)
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of John Rader
Sent: Sunday, January 18, 2004 7:04 PM
To: tentec@contesting.com
Subject: RE: [TenTec] Centaur quiet fan?
Well,
I went shopping for a new fan at several of the D/FW electronic
stores. I found a number of AC fans that are direct replacements.
Some had lower Db and similar CFM specs but, none were quieter.
So I put in a 150 ohm 25 watt resistor.
John K5XTX
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