118 lines
3.8 KiB
Plaintext
118 lines
3.8 KiB
Plaintext
This file Presented by METRONET system (301)-944-3023 The bug's that this
|
||
device detects are Infinity transmitters, read the Infinity transmitter
|
||
bulletin for more info.
|
||
|
||
::::::::::::::::::::::::::::::::::::::
|
||
: :
|
||
: How to build a Bug Detector :
|
||
: :
|
||
: by :
|
||
: :
|
||
: The Gremlin :
|
||
: :
|
||
::::::::::::::::::::::::::::::::::::::
|
||
|
||
|
||
|
||
Warning: This formatted for 80 column and upper/lower case capabilities...
|
||
|
||
][][][
|
||
Basic theory
|
||
][][][
|
||
|
||
Because most bugs are triggered through certain frequencies, it is very simple
|
||
to build a small sweeping device that will trigger any bug present. The two
|
||
IC's are what create the oscillating tone. The IC1 operates at .8 Hz where the
|
||
IC2 runs at about 10 Hz. Frequency is determined by this formula:
|
||
|
||
f=1.44/(R1+2R2)C)
|
||
|
||
f measured in Hertz, R in megohms, and C in microfarads
|
||
|
||
The oscillation can be varied by the voltage placed upon pin #5. This is how
|
||
we create the wave sound. When voltage goes up, so does the frequency, and
|
||
vice-versa.
|
||
|
||
Normally, the output pin 3 is a square wave. Since we need varying wave at pin
|
||
#5, we need a triangular wave. We get this through integrating the square wave
|
||
created at pin #3 of IC1. It is acheived by D1, D2, R3, R4 and C2.
|
||
|
||
This varying output is fed into the phone line by transformer T1 which has an 8
|
||
ohm winding going to pin #3 of IC2 and the 500 end to a 0.1 microfarad capaci-
|
||
tator at the phone line.
|
||
|
||
Enuf talk..let's get movin!
|
||
|
||
|
||
][][][
|
||
Schematic Design
|
||
][][][
|
||
|
||
|
||
+9v
|
||
|
||
__________|_____________________________
|
||
| _|__|_ _|__|_ |
|
||
R1 | 4 8 | _|<D1__R3__ | 4 8 | R5
|
||
| | | | | | | |
|
||
+-----+2 3+---+ +-+5 2|--+----+----+
|
||
| | | |_>|R2__R4__| | | | |
|
||
R2 | ic1 | | | ic2 | R6 D3
|
||
| +-+6 | ___| | 6+-+ | V
|
||
| | | | | | | | | -
|
||
+---+-+7 | | +--+3 7+-+-----+----+
|
||
| |___1__| | | |___1__| |
|
||
| | | | | C4
|
||
| | | | | ^
|
||
C1 | C2 T1 _|_._C3|(_. |
|
||
^ | ^ 8--500<_|_. |
|
||
|_________|______________|__|______|__________|
|
||
|
|
||
-G-
|
||
|
||
|
||
][][][
|
||
Parts List
|
||
][][][
|
||
|
||
C1 10-uF electrolytic capacitator 25 WDVC
|
||
C2 300-uF electrolytic capacitator 25 WDVC
|
||
C3 0.1-uF capacitator
|
||
C4 0.068-uF capacitator
|
||
D1-D3 1N914
|
||
IC1,IC2 555 timers
|
||
R1, R4-R6 1-kilohm resistors
|
||
R2 91-kilohm resistor
|
||
R3 22 kilohm resistor
|
||
T1 500-to-8 ohm audio output transformer
|
||
|
||
][][][
|
||
Construction
|
||
------------
|
||
|
||
When building this unit, it is very useful to use a breadboard or vector board.
|
||
I suggest that leads being connected to phone line (T1, C3) end in a jack or a
|
||
modular connector to make the hookup easier. To test it, hook it to the phone
|
||
line (not the suspected line) and call the line you suspect is being bugged.
|
||
The party you are calling should not answer the phone. Now, the unit is
|
||
activated. 3 times, every 4 seconds, the oscillator will go up to 10 kHz and
|
||
back down again..like a bell curve..If there is a frequency sensitive bug on
|
||
the line, the phone will stop ringing, and you will be able to hear everything
|
||
said in the room. If the phone keeps ringing, chances are that all is
|
||
fine..unless the bug requires a multi-frequency trigger..but these are very
|
||
rare..
|
||
|
||
So, we can see that 415-BUG-1111 really does work! It creates the tone..any
|
||
click heard is the Phone Co's (or whoever is bugging) speaker/tape recorder
|
||
picking up!
|
||
|
||
|
||
Have phun, and hope it helped!
|
||
|
||
The Gremlin
|
||
|
||
...call the Gremlin's Lair..201-536-7794..today!...
|
||
|
||
[Thanks again Metronet!]
|
||
Call The Works BBS - 1600+ Textfiles! - [914]/238-8195 - 300/1200 - Always Open
|
||
|