Re: HV protection for receiver input?

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#2221

From: Mark
Date: Wed, 06 Aug 2003 13:38

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I find it hard to believe that a zapper would take out a
car alarm. The energy from the ignition and sparkplugs
would produce as much energy. Have you tested a
zapper to see if that's really what's happening. I would
think that the alarm was tested for ESD. Please Comment?


"DaveC" <dave-usenet3016@mailblocks.com> wrote in message
news:0001HW.BB56508400106C52F0386600@news.individual.net...
> I am trying to fix a car alarm/remote locking unit. It seems that punks
are
> putting personal protection "zappers" to the bumpers of cars and frying
the
> receiver input.
>
> The input is very simple: length of wire serves as antenna, connected to
> input of wide bandwidth transistor driving tuned circuit.
>
> Transistor is fried. How can I protect this from several thousand volts
(I'm
> guessing here; what's the typical input from one of these zappers?)? Are
> air-gap devices recommended?
>
> Example p/n's would be appreciated.
>
> Thanks,
> -- 
> Dave C
> dave-usenet3016@mailblocks.com
>

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From: "Mark" <x@sbcglobal.net>
Newsgroups: sci.electronics.design,alt.engineering.electrical,sci.electronics.repair,aus.electronics
References: <0001HW.BB56508400106C52F0386600@news.individual.net>
Subject: Re: HV protection for receiver input?
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