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From: Richard Rasker
Subject: Re: So how DO you find the burned out bulb?
Date: Fri, 27 Dec 2002 15:43:08 GMT
Organization: de Kooi Internetdiensten
References: <email@example.com> <22JO9.515$Oc.firstname.lastname@example.org>
NNTP-Posting-Date: Fri, 27 Dec 2002 15:44:09 +0000 (UTC)
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On 12/26/02, 8:48:14 PM, "Anthony Q. Bachler"=20
> I think the idea is to avoid pulling bulbs...
I can't get the earlier postings of this thread from my news server any =
more, so I don't know whether the following suggestion has previously=20
been made - please forgive me if it's old news:
A *very* simple method without pulling bulbs is to use an audio amplifie=
(preferably a guitar amp) as a capacitive AC detector. Simply plug in a =
guitar cable, slide the tip of the jack plug (which has this convenient =
indented shape) along the wire and listen for a sudden increase or=20
decrease in hum when skipping a bulb.
It should work with a normal stereo amp as well, though you'll have to=20
turn it up considerably higher (since both it's sensitivity and input=20
impedance are lower). Or use the mic input of a cassette player.
I use this method for finding breaks in any type of non-shielded cables =
(or it must be the shielding itself that's broken). If applying AC mains=
voltage is undesirable, I simply hook up a signal generator at a few KHz=
- of course with the ground lead connected to the amp ground.
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