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[AMPS] HV Fusing / Diode Protection

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Subject: [AMPS] HV Fusing / Diode Protection
From: philk5pc@tyler.net (Phil Clements)
Date: Mon, 12 Jun 2000 10:09:48 -0500
Take a single strand out of a piece of small stranded hook-up
wire, and solder it across a 2 watt resistor. The purist can
adjust the wire size so it will melt at the desired current.
GL!
(((73)))
Phil, K5PC
Subject: [AMPS] HV Fusing / Diode Protection


>
>
> 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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>



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