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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: So how DO you find the burned out bulb?
Date: Tue, 24 Dec 2002 06:57:53 GMT
NNTP-Posting-Date: Mon, 23 Dec 2002 22:57:53 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
Bill Brown wrote:
> I have been following the "Greenlee Voltage Stick" posts. I bought a $5
> Radio Shack Voltage detector and had similar problems figuring out which
> bulb is burned out in a series xmas light string..
> So the question is How do you find the burned out bulb?? If I had my magic
> wand I would create a pen sized stick with a hole in the bottom that you
> slip over the suspect bulb (while it still plugged into a powered string).
> If it buzzed (or didn't buzz) then you pop the bulb out with the attached
> grippers (Kind of like a screw holder, except sharper). It should be easy
> because you have a 120 VAC differential across the burned out bulb, but
> essentially nothing across a good bulb.
> Hmmm... maybe I should also post this to sci.electronics.design and see if
> any of the whiz bang designers over there have any good ideas. Hey guys
> over there, build a million, sell a million, make a million, $$ that is!
> See the original series of posts in sci.engr.lighting, under the thread
> "Greelee Voltage Stick".
It turns out that Radio Shack had something rather close to that; 5"
long by 0.75" wide by 0.3" to 0.5" thick (depending where you measure).
Black with yellow clip for pocket; uses two button cells that seem to
I scratched two different catalog numbers on the back: 23-1521 and
Sensitive to AC voltages from 70 to 440V; sold under their Micronta
Once, one of the stores had one (count them all if you can) A.W.
Sperry adjustable sensitivity unit; brown, 5" long by 1.5" wide by about
1" thick (depending where you measure).
Uses two UM-3 batteries and also has a pocket clip; no part number
Both units use CMOS logic gates connected as amplifiers (negative DC
feedback for linear operation), and a metal plate at the nose goes to an
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