anti-shop lifting devices
Joe Bach
some stores put little plastic devices on their products that contain two
metal strips. The check out station has a method of altering the things,
if thay are not properly altered a detector at the door presumably
notifies the thugs in the back room to do what ever thay do about the
situation.
What are the two little metal strips in side of the package? I pryed one
open, with some effort(good glue}, and found two metal strips one
rectangular and another that was a parallelogram. Both are quite thin.
I presume that the effect employed in this system is magnetic, and that
one or both of the are magnetized or demagnetized at the check out.
Can anyone explane how this system works and what the two strips are made
of? Maybe we could make something usefull out of them "magnetometers
??" instead of throwing them away.
The world needs a ready supply of cheep home built magnetometers!
Joe Bach
jb...@luminet.net
John Lundgren
Joe Bach (jb...@luminet.net) penned:
: some stores put little plastic devices on their products that contain two
: metal strips. The check out station has a method of altering the things,
: if thay are not properly altered a detector at the door presumably
: notifies the thugs in the back room to do what ever thay do about the
: situation.
I came out of Fry's Electronics a few weeks ago and right at the front
entrance there were two Fry's guys pinning a shoplifter to the ground.
The guy was kicking and screaming expletives and "Lemme go or I'll Bite
you!" etc. As I walked out to the car I watched them take the guy away
in cuffs. Whatever they have, I'm not aware of, since I've never seen any
special tags or sensors at the exit. But apparently they have something.
: What are the two little metal strips in side of the package? I pryed one
: open, with some effort(good glue}, and found two metal strips one
: rectangular and another that was a parallelogram. Both are quite thin.
: I presume that the effect employed in this system is magnetic, and that
: one or both of the are magnetized or demagnetized at the check out.
: Can anyone explane how this system works and what the two strips are made
: of? Maybe we could make something usefull out of them "magnetometers
: ??" instead of throwing them away.
: The world needs a ready supply of cheep home built magnetometers!
The sticker usually is a resonant circuit that takes energy from the
sensor coils and reradiates it back on a different freq. This is what the
sensor picks up to set the alarm off. They obviously don't want the
general public to know too much since then they could defeat the system.
I've heard stories in alt.2600 newsgroup that covering the sticker with
tinfoil will stop it. Never tried it, tho.
: Joe Bach
: jb...@luminet.net
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Bruce Bostwick
jlun...@delta1.deltanet.com (John Lundgren) wrote:
>I've heard stories in alt.2600 newsgroup that covering the sticker with
>tinfoil will stop it. Never tried it, tho.
don't know if you can shield the thing well enough with aluminum foil, but
you *can* saturate it with a permanent magnet so it won't resonate -- takes
one of those really strong samarium cobalt ceramic magnets you can get at
the Shack ...
of course, you could use a soldered copper sheetmetal box, but the sales
folks might get a wee bit suspicious about that ... ;-)
<BGB> http://ccwf.cc.utexas.edu/~lihan/ mailto:li...@ccwf.cc.utexas.edu
Rusty Angel
Joe Bach wrote:
>
> some stores put little plastic devices on their products that contain two
> metal strips. The check out station has a method of altering the things,
Yep the checkout station does have a method of altering the things...The
process actually toasts the little buggers, most likely making them usless
for any other purpose.
Rusty Angel aan...@epix.net
Bangor, Pa. USA
Richard Steven Walz
In article <4mjd59$r...@news02.deltanet.com>,
John Lundgren <jlun...@delta1.deltanet.com> wrote:
>Joe Bach (jb...@luminet.net) penned:
>: some stores put little plastic devices on their products that contain two
>: metal strips. The check out station has a method of altering the things,
>: notifies the thugs in the back room to do what ever thay do about the
>: situation.
>
>I came out of Fry's Electronics a few weeks ago and right at the front
>entrance there were two Fry's guys pinning a shoplifter to the ground.
>The guy was kicking and screaming expletives and "Lemme go or I'll Bite
>you!" etc. As I walked out to the car I watched them take the guy away
>in cuffs. Whatever they have, I'm not aware of, since I've never seen any
>special tags or sensors at the exit. But apparently they have something.
>
>: What are the two little metal strips in side of the package? I pryed one
>: open, with some effort(good glue}, and found two metal strips one
>: rectangular and another that was a parallelogram. Both are quite thin.
>: I presume that the effect employed in this system is magnetic, and that
>: one or both of the are magnetized or demagnetized at the check out.
>: Can anyone explane how this system works and what the two strips are made
>: of? Maybe we could make something usefull out of them "magnetometers
>: ??" instead of throwing them away.
>: The world needs a ready supply of cheep home built magnetometers!
>
>The sticker usually is a resonant circuit that takes energy from the
>sensor coils and reradiates it back on a different freq. This is what the
>sensor picks up to set the alarm off. They obviously don't want the
>general public to know too much since then they could defeat the system.
>tinfoil will stop it. Never tried it, tho.
>
>: jb...@luminet.net
>
>| John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@ |
>| Rancho Santiago Community College District | deltanet.com |
No, one side usually won't. This circuit is the equivalent of an EM
flourescent cavity in the RF. Just put it in an aluminum foil lined
bag (sew the taped and overlapped aluminum bag into the interspace of
a two-layered cloth bag with aluminum also in the lid flap of the bag
and all connected electrically), and it can't be "seen" or activated.
Possession of such a bag, if caught in theft, constitutes possession
of a burgulary tool, however, another charge most places!! But who
takes bags apart if the alarm doesn't activate!?? Nobody! THAT's the
BIGGER secret they don't want folks to know!! Most security wouldn't
even check a bag like that by taking it apart, either, if they didn't
SEE aluminum in it!! They ARE taught to look for THAT!! Another thing
that works for small things is a tea canister with the lid and top
edges sanded for a Faraday cage, like the aluminum bag. You have to
watch for that, though as some can edges with a bad contact ALSO
re-fluoresce!! But if you jerk around with stuff too much, the
cameras will get you anyway!
-Steve
--
-Steve Walz rst...@armory.com ftp://ftp.armory.com/pub/user/rstevew
mirrored: ftp://ieee.cas.uc.edu/pub/electronics/faqs/ftp.armory.com
and Europe: ftp://ftp.cised.unina.it/pub/electronics/ftp.armory.com
and Oz: ftp://ftp.peninsula.apana.org.au/pub/electronics/ftp.armory.com
Richard Steven Walz
In article <4mlqge$o...@geraldo.cc.utexas.edu>,
Bruce Bostwick <li...@ccwf.cc.utexas.edu> wrote:
>jlun...@delta1.deltanet.com (John Lundgren) wrote:
>>I've heard stories in alt.2600 newsgroup that covering the sticker with
>>tinfoil will stop it. Never tried it, tho.
>
>you *can* saturate it with a permanent magnet so it won't resonate -- takes
>one of those really strong samarium cobalt ceramic magnets you can get at
>the Shack ...
>
>of course, you could use a soldered copper sheetmetal box, but the sales
>folks might get a wee bit suspicious about that ... ;-)
>
><BGB> http://ccwf.cc.utexas.edu/~lihan/ mailto:li...@ccwf.cc.utexas.edu
Nawh, plain foil is used for Faraday cages for noise emission
compliance test rooms, with the proper assembly techniques, of course!
As for a box, never heard of a box purse or a rucksack? I have it on
EXCELLENT authority from a "procurer" friend of mine that it leaves you
with no record unless you are caught on camera! She and I "exchange
services" at times!! I wonder if exchange of sexual favors is taxable
under tax code as "unreported barter income"!! Then again, the problem
might be in fixing the price!!! ;-)
-Steve (Boy do I know how to start trouble, don't I? I love it!)