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LF: 500 kHz - Fans

To: LF Group <[email protected]>
Subject: LF: 500 kHz - Fans
From: Chris Osborn <[email protected]>
Date: Sat, 20 Jun 2009 06:34:25 +0000 (GMT)
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LF,
I've nearly completed my new PA for 500 kHz and have now managed to
stop destroying FET's.
 
Unfortunately I have an unusual problem in that the heatsink cooling fans
are going U/S.
 
I have used 24 volts brushless PC-type fans and after a while they
either die completely or start to go backwards slowly. . .
 
The fans may be slightly over-run but only by a volt or so and on key-up
(unregulated supply) and are situated about 50 mm (2 inches) from the heatsink.
I have rf decoupled them from the supply but maybe not well enough !
 
Any suggestions in curing this problem would be most welcome.
 
73 Chris G3XIZ
 
 
 

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