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[AMPS] HV Fusing / Diode Protection

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Subject: [AMPS] HV Fusing / Diode Protection
From: nq5t@home.com (Grant Youngman)
Date: Mon, 12 Jun 2000 09:45:24 -0500

In the L4-B power supply, Drake used an IRC type BWH/SPH "fail-safe" 
resistor (0.82 ohms/2W) as a fuse to protect the diode strings in the event of 
a short or closure of the RF deck cabinet interlock. 

The resistor is still a current IRC product (as a type SPH device), but is not 
a 
high demand item, and is out of stock at every IRC distributor I have checked 
(including Drake).   So while it is "available" it is essentially Unobtainium.  
Newark wants a minimum order of 250 each to even go ask IRC for a 
production run.  At $0.44 each, that makes a pretty expensive price for
 ONE ;-)

So the question.  Is there some generally accepted alternate method for 
protecting HV diode strings?  A wire fusible link, perhaps? Or is this even 
considered necessary?  Would just leaving the part out create an 
unacceptable fire hazard?  etc.

Grant



----------------------------
Grant Youngman -- NQ5T
nq5t@home.com
http://www.globeking.com
Double Oak, TX (near Dallas)

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