[Amps] Quieting SB-1000

Vic K2VCO vic at rakefet.com
Sun Feb 15 10:33:23 PST 2009


In my quest for a quiet SB-1000, I replaced the fan. The original is a Nidac TA450AC, 
which is rated at 68 cfm and operates on 120vac. I replaced it with an ADDA AD1212LB3GL-LF 
which I got from Mouser Electronics. It's rated 72 cfm, operates on 12v DC, fits 
perfectly, and is *much* quieter. I followed the advice of N5OP and put a piece of 
hardware cloth (1/4" galvanized mesh) between the fan and the chassis to prevent RF from 
disturbing it.

It helped to remove the bolts holding the power transformer and slide it back. It also 
helped (a lot) to glue the nuts in place on the fan before installing it.

Now the remaining noise is a very loud buzz from the transformer. The bolts holding the 
laminations and the transformer mounting are tight.

Does anyone have any ideas about reducing transformer buzz short of buying a new Hipersil 
transformer?
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco


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