[TenTec] Centaur quiet fan?

[Patrick A. Thompson Sr.]

I guess the "dimple" diodes are the really cute ones?  sorry ;-)

I meself hav never ade a tiepo!

Using the forward voltage drop across a diode is a great way to drop a small
voltage.  The drop will be reasonably constant with varying current and that
can be a plus. I've used similar circuits to drop voltage to HT's from 12vdc
supplies and I've seen a string of diodes used to provide variable bias for
a tube amp, or raise the ground pin of a 7812 regulator to bump the voltage
up. If you had to buy a suitable resistor instead of already having a junk
box item the diodes would probably be cheaper.

Pat
wa4tuk

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Rick Westerman
Sent: Sunday, January 18, 2004 1:19 PM
To: tentec at contesting.com
Subject: RE: [TenTec] Centaur quiet fan?


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 at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of John Rader
Sent: Sunday, January 18, 2004 7:04 PM
To: tentec at 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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