The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
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: <firstname.lastname@example.org> <22JO9.515$Oc.email@example.com>
NNTP-Posting-Date: Fri, 27 Dec 2002 15:44:09 +0000 (UTC)
X-Newsreader: Mozilla/3.0 (compatible; StarOffice/5.2;Linux)
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.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup