E
ehsjr
Guest
grittysoap@hotmail.com wrote:
Ed
Yes. And the capacitor is too small.
Ed
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BobG
Guest
The KGB had a mole at the construction site of the US embassy in Moscow
and they filled the concrete beams with little capsules that formed
resonant cavities. When the spooks outside beamed some microwaves at
the building, talking in the room modulated the resonance enough to
detect with an off site receiver. Playing pinknoise or punkrock at
levels louder than the conversation were needed to mask this.
and they filled the concrete beams with little capsules that formed
resonant cavities. When the spooks outside beamed some microwaves at
the building, talking in the room modulated the resonance enough to
detect with an off site receiver. Playing pinknoise or punkrock at
levels louder than the conversation were needed to mask this.
P
Phil Allison
Guest
"Michael Black"
** Switching EMI has a very broad spectrum (starting at a very low frequency
covering many octaves) and THAT will stand out on an analyser's display.
Unlike a single frequency from a typical FM bug.
........ Phil
well, if a signal is comming from a lamp there might be a bug...
Well no, because that signal might be a light dimmer, or connected
with the compact fluorescent bulb in there.
** Switching EMI has a very broad spectrum (starting at a very low frequency
covering many octaves) and THAT will stand out on an analyser's display.
Unlike a single frequency from a typical FM bug.
........ Phil
J
Joe
Guest
Alex wrote:
google for "tunnel diode"
Joe
Alex,Hello people,
Is the following true in practise ? If someone has to test that a
certain object is bugged then simply scan the object for RF / UHF
waves. What is the easiest way of scanning ? a TV ?
Thank you guys : )
google for "tunnel diode"
Joe
D
Don Klipstein
Guest
In article <IcTsh.1067$2n.434@trndny06>, ehsjr wrote:
the signal in response to your voice (or whatever action the bug is
monitoring, such as computer keyboard activity).
If the lamp has an incandescent "lamp"/"bulb" and no dimmer and a
traditional mechanical switch, then an RF emission from it is suspect.
- Don Klipstein (don@misty.com)
I think a "bug detector" would have a way of checking for modulation ofme wrote:
"Phil Allison" <philallison@tpg.com.au> wrote in
news:51giagF1kiam7U1@mid.individual.net:
"Dr. Anton T. Squeegee"
There are many ways to bug a communications device, and not all of
them are radio-based. However, in the sense of transmitters, you are
correct.
The best way to scan for such a device would be with a handheld
spectrum analyzer. Be prepared to spend at least a few thousand for a
good one.
** How does a " bug " signal stand out from all the regular
transmissions seen on the spectrum ??
Mobile phones generate powerful signals over ranges of 30 metres or
more, one of them can be the "bug".
Reality is, bug detection is a job for a *well equipped expert *
armed with a clear idea of what sort of bug he is looking for and some
knowledge of where it might be located.
well, if a signal is comming from a lamp there might be a bug...
Or a dimmer. Or a touch switch. Or a solid state ballast.
the signal in response to your voice (or whatever action the bug is
monitoring, such as computer keyboard activity).
If the lamp has an incandescent "lamp"/"bulb" and no dimmer and a
traditional mechanical switch, then an RF emission from it is suspect.
- Don Klipstein (don@misty.com)
B
Bob Masta
Guest
On Sat, 20 Jan 2007 22:54:03 -0800, Dr. Anton T. Squeegee
<SpammersBlow@dev.null> wrote:
use pseudo-random pulse spread-spectrum methods.
The output will look just like low-level background noise, and
there will be no detectable modulation. Only a matching
receiver can extract the signal, or even tell that there *is*
a signal and not simply noise.
I guess if you were searchng for a bug like that, you'd
have to rely on directional field strength alone, since
the spectrum (as such) wouldn't help.
Just a thought...
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Signal Generator
Science with your sound card!
<SpammersBlow@dev.null> wrote:
Hmm, if I were "Q" and designing modern RF bugs, I'dIn article <1169326967.460164.14370@q2g2000cwa.googlegroups.com>,
electronics_student_2007@yahoo.com (known to some as Alex) scribed...
Hello people,
Is the following true in practise ? If someone has to test that a
certain object is bugged then simply scan the object for RF / UHF
waves. What is the easiest way of scanning ? a TV ?
There are many ways to bug a communications device, and not all of
them are radio-based. However, in the sense of transmitters, you are
correct.
The best way to scan for such a device would be with a handheld
spectrum analyzer. Be prepared to spend at least a few thousand for a
good one.
use pseudo-random pulse spread-spectrum methods.
The output will look just like low-level background noise, and
there will be no detectable modulation. Only a matching
receiver can extract the signal, or even tell that there *is*
a signal and not simply noise.
I guess if you were searchng for a bug like that, you'd
have to rely on directional field strength alone, since
the spectrum (as such) wouldn't help.
Just a thought...
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Signal Generator
Science with your sound card!
Guest
okay thanks ed, will changing the top resistor to 2.2K and the bottom
resistor to 68k and the cap to 10uF do the same thing?
I want it to turn on for a half second and turn off for a half second
resistor to 68k and the cap to 10uF do the same thing?
I want it to turn on for a half second and turn off for a half second
R
Rich Grise
Guest
On Mon, 22 Jan 2007 00:04:56 +0000, ehsjr wrote:
Cheers!
Rich
Or a freakin' BlueTooth Home Control System or some such. ;-)me wrote:
"Phil Allison" <philallison@tpg.com.au> wrote in
news:51giagF1kiam7U1@mid.individual.net:
"Dr. Anton T. Squeegee"
There are many ways to bug a communications device, and not all of
them are radio-based. However, in the sense of transmitters, you are
correct.
The best way to scan for such a device would be with a handheld
spectrum analyzer. Be prepared to spend at least a few thousand for a
good one.
** How does a " bug " signal stand out from all the regular
transmissions seen on the spectrum ??
Mobile phones generate powerful signals over ranges of 30 metres or
more, one of them can be the "bug".
Reality is, bug detection is a job for a *well equipped expert *
armed with a clear idea of what sort of bug he is looking for and some
knowledge of where it might be located.
well, if a signal is comming from a lamp there might be a bug...
Or a dimmer. Or a touch switch.
Or a solid state ballast.
Cheers!
Rich
S
Sambo
Guest
grittysoap@hotmail.com wrote:
and resistor on it's right. It shorts out everything above the transistor and
all available. power from the battery goes through the poor little 2222.
I guess the 2n2222 marking next to the photo-tran is just because it was an
available transistor symbol?
My guess is you plugged it in with the photo-transistor exposed to ambient light,
Q2 turned on and cooked. Try a new transistor or test the one you got if you can.
The battery may not be any good after that either.
The wire from the +power to photo transistor should not be connected to the LEDhello, I've designed the following circuit to switch a relay on and off
ever half second.(It's the one on the top right hand corner in the
first link.)
http://i8.photobucket.com/albums/a30/sequesteredfishy/zzzzzyz.jpg
I built the circuit and suffice to say it didn't work. I was wondering
if you guys could tell me where I went wrong. Is the resistance too
high?
I took the relay out and put in a LED instead and that didn't flash
either.
so here is a terrible picture of the conductive tracks on my board and
I hope you can figure out what's going on.(the yellow is the 555)
http://i8.photobucket.com/albums/a30/sequesteredfishy/zzboard.gif
In the light activated relay circuit, there seams to be an error in the drawing.
and resistor on it's right. It shorts out everything above the transistor and
all available. power from the battery goes through the poor little 2222.
I guess the 2n2222 marking next to the photo-tran is just because it was an
available transistor symbol?
My guess is you plugged it in with the photo-transistor exposed to ambient light,
Q2 turned on and cooked. Try a new transistor or test the one you got if you can.
The battery may not be any good after that either.
M
Michael A. Terrell
Guest
BobG wrote:
Punk rock? Do you have any idea when that embasy was built?
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
The KGB had a mole at the construction site of the US embassy in Moscow
and they filled the concrete beams with little capsules that formed
resonant cavities. When the spooks outside beamed some microwaves at
the building, talking in the room modulated the resonance enough to
detect with an off site receiver. Playing pinknoise or punkrock at
levels louder than the conversation were needed to mask this.
Punk rock? Do you have any idea when that embasy was built?
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
M
Michael A. Terrell
Guest
Joe wrote:
Why? Where are you going to find one?
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
Alex wrote:
Hello people,
Is the following true in practise ? If someone has to test that a
certain object is bugged then simply scan the object for RF / UHF
waves. What is the easiest way of scanning ? a TV ?
Thank you guys : )
Alex,
google for "tunnel diode"
Joe
Why? Where are you going to find one?
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
M
Michael Black
Guest
"Michael A. Terrell" (mike.terrell@earthlink.net) writes:
the building, and bring in US people to construct a new one.
The "cavity" bit threw me off a bit, because a quick reading made
me think he was talking about an earlier bugging incident.
The book I have about "electronic eavesdropping", which seemed to
be quite the standard at the time (though maybe simply because there
weren't really books on the topic), has a bit about that embassy thing,
and the book is now about forty years old.
It dated from the forties, it was a specific thing, "The Great Seal of
the US" that the Russians gave to the US ambassador that was set up to
be a modulator of an outside radio signal. That was a pretty legendary
thing, though certainly there was no punk music at the time to mask things.
I'm not sure the later embassy used anything but traditional active
bugs.
Michael
eighties. It was so riddled with bugs that they had to abandonBobG wrote:
The KGB had a mole at the construction site of the US embassy in Moscow
and they filled the concrete beams with little capsules that formed
resonant cavities. When the spooks outside beamed some microwaves at
the building, talking in the room modulated the resonance enough to
detect with an off site receiver. Playing pinknoise or punkrock at
levels louder than the conversation were needed to mask this.
Punk rock? Do you have any idea when that embasy was built?
Apparently the seventies, and they started finding the bugs in the
the building, and bring in US people to construct a new one.
The "cavity" bit threw me off a bit, because a quick reading made
me think he was talking about an earlier bugging incident.
The book I have about "electronic eavesdropping", which seemed to
be quite the standard at the time (though maybe simply because there
weren't really books on the topic), has a bit about that embassy thing,
and the book is now about forty years old.
It dated from the forties, it was a specific thing, "The Great Seal of
the US" that the Russians gave to the US ambassador that was set up to
be a modulator of an outside radio signal. That was a pretty legendary
thing, though certainly there was no punk music at the time to mask things.
I'm not sure the later embassy used anything but traditional active
bugs.
Michael
E
ehsjr
Guest
grittysoap@hotmail.com wrote:
http://www.csgnetwork.com/ne555timer2calc.html
You can enter the values into the calculator
to see how the 555 should behave.
You can connect a 470 ohm resistor in series with
an LED, and connect that combo between pin 3 of the
555 and ground. (Negative side of the LED to ground)
Then you should see it blink on and off about
every 1/2 second. You may be able to hear the relay
clicking, too. If you get the LED to blink properly,
it means your 555 circuit is doing what you want, and
you will need to look at the other part of the circuit
if it's still not working.
Ed
That'll be pretty close. See this site:okay thanks ed, will changing the top resistor to 2.2K and the bottom
resistor to 68k and the cap to 10uF do the same thing?
I want it to turn on for a half second and turn off for a half second
http://www.csgnetwork.com/ne555timer2calc.html
You can enter the values into the calculator
to see how the 555 should behave.
You can connect a 470 ohm resistor in series with
an LED, and connect that combo between pin 3 of the
555 and ground. (Negative side of the LED to ground)
Then you should see it blink on and off about
every 1/2 second. You may be able to hear the relay
clicking, too. If you get the LED to blink properly,
it means your 555 circuit is doing what you want, and
you will need to look at the other part of the circuit
if it's still not working.
Ed
D
default
Guest
On Sat, 20 Jan 2007 08:30:47 -0800, saxum@webtv.net (Grostle News)
wrote:
- or the oscillator might pull enough current to kill the oscillator
transistor. Ideally, I'd creep up the voltage with a variable source
and watch for smoke and feel the transistor and resistors to find hot
ones.
Or ditch the flash tube, replace the cap with a higher voltage one and
try it - especially if you don't mind losing the first one you
practice on. The output may exceed the normal voltage because
efficiency improves as voltage goes up - the required transistor drop
is met and everything over that goes to producing more output.
There's always a safety factor built in with a higher voltage cap than
the expected voltage and the electrolytic you use might withstand more
than its rating by a few percent.
Your use of the output may be more benign than what the camera
intended and that could also work in your favor - the oscillator pulls
more current when it is charging the cap from zero - flash it a lot of
times quickly and it works the oscillator harder.
We could use more data on the use . . .
--
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http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----
wrote:
It might work just like you want, double the input, double the outputI want to alter a circuit:
I took out the flash circuitry (board, bulb and battery) from a Kodak
disposable camera. The main flash electrolytic capacitor is rated at
330v and 84 mfd. ( I think 84 is the value, but don't have with me at
this time)
The cap charge comes from a single AA 1.5v cell. It looks like within
the flash circuit there is a small transformer with a transistor
oscillator circuit that does the duty of raising the voltage.
I have a non-photographic application for this type of circuit. After
removing the flash bulb I need to change the cap by replacing it with
one rated at 600-660v.
QUESTIONS (2):
(1) Would it be possible to use TWO cells in series [3v] instead of just
the one in order to charge the replacement cap at it's 660v rating?
1.5v cell---> 330v
2 × 1.5v cells [3v]-----> 660v ?
(2) Would other devices of the circuit need to be changed if the input
voltage is doubled as described?
I like the idea of getting use out of something that is commonly
available and that would ordinarily be thrown away (disposable) after
using.
Important safety reminder: if you ever experiment with one of the flash
units don't forget to discharge the capacitor before handling. When I
discharged the one in my flash circuit it was remarkably loud and
powerful enough to leave a small bead of molten chrome steel on my
screwdriver!
- or the oscillator might pull enough current to kill the oscillator
transistor. Ideally, I'd creep up the voltage with a variable source
and watch for smoke and feel the transistor and resistors to find hot
ones.
Or ditch the flash tube, replace the cap with a higher voltage one and
try it - especially if you don't mind losing the first one you
practice on. The output may exceed the normal voltage because
efficiency improves as voltage goes up - the required transistor drop
is met and everything over that goes to producing more output.
There's always a safety factor built in with a higher voltage cap than
the expected voltage and the electrolytic you use might withstand more
than its rating by a few percent.
Your use of the output may be more benign than what the camera
intended and that could also work in your favor - the oscillator pulls
more current when it is charging the cap from zero - flash it a lot of
times quickly and it works the oscillator harder.
We could use more data on the use . . .
--
----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----
G
Grostle News
Guest
Hi Bob, you wrote and guessed what I was going to use the circuit for
(Geiger counter):
Thanks
gn
(Geiger counter):
You are a very good guesser and I will emloy your search strategy.You haven't mentioned what you plan for this,
but I've seen Web pages devoted to making
your own radiation detector that use disposable
flash units (minus the flash tube). You might try
searching along those lines, maybe include
"scintillation counter" or even "Geiger counter"
in the search.
Thanks
gn
G
Grostle News
Guest
Thanks to "Rube Goldberg" and "default" for sharing your worthy
knowledge and circuit design/conversion ideas.
saxum, g.n.
knowledge and circuit design/conversion ideas.
saxum, g.n.
G
Grostle News
Guest
Hi John, thanks for your assistance. You included info about the
possibility of overheating:
bit of it wafting upward in its enigmatical way and then disappearing
into thin air!! <abracadabra>
saxum g.n.
possibility of overheating:
LOL!! I know about the "magic smoke", Over the years I've seen quite a....it may cause the active electronics to lose
their magic smoke :-(
bit of it wafting upward in its enigmatical way and then disappearing
into thin air!! <abracadabra>
saxum g.n.
H
Homer J Simpson
Guest
"Grostle News" <saxum@webtv.net> wrote in message
news:28757-45B6B808-1055@storefull-3256.bay.webtv.net...
--
--
..
..
..
..
..
..
..
..
news:28757-45B6B808-1055@storefull-3256.bay.webtv.net...
Ever seen it coming out of the boss's new $250,000 molding machine?....it may cause the active electronics to lose
their magic smoke :-(
LOL!! I know about the "magic smoke", Over the years I've seen quite a
bit of it wafting upward in its enigmatical way and then disappearing
into thin air!! <abracadabra
--
--
..
..
..
..
..
..
..
..
A
Art Deco
Guest
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EBULRE ALEWXOVE AMUZQYJ
awipt
K
K. A. Cannon
Guest
ENIDPIPO lenlyb Every old figs care Ophelia, and they strangely dye Debbie too.
CECNULY Johann, still arriving, lives almost familiarly, as the printer wanders towards their unit.
APYPR If you will help Laura's square for units, it will happily solve the draper.
IFUSD
ABAVXO VEQWYKAD
zyssuwo Frederick cooks the enigma in front of hers and weakly recollects.
CECNULY Johann, still arriving, lives almost familiarly, as the printer wanders towards their unit.
APYPR If you will help Laura's square for units, it will happily solve the draper.
IFUSD
ABAVXO VEQWYKAD
zyssuwo Frederick cooks the enigma in front of hers and weakly recollects.