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!! THE BUG DETECTOR !!
BY: FORD PREFECT
UPLOADED BY: The Phoney Phoner
and The Skeleton Krew
What you will need:
(the number in brackets is a reference
number which matches the schematic. The
number in paranthesise is the amount of
the part needed.)
[1] (1) 1n34a crystal diode
[2] (2) 2n107 audio transistors
(ge-2 or equivalent)
[3] (1) 3k ohm variable resistor
[4] (2) 560 ohm 1/2 watt resistor
[5] (1) 15k ohm variable resistor
[6] (1) 500 ohm variable resistor
[7] (1) .002 Uf capacitor
[8] (1) 1.5 Volt aa battery
[9] (1) aa battery holder
[10] (1) 0-300 microammeter
(lafayette 99-g-5028 or
equivalent)
[11] (1) 10 millihenry choke (ohmite
z-50)
[12] (1) single-pole single-throw
(spst) toggle switch
[13] (1) project box (radio shack)
[14] (1) antenna (either from an old
transistor radio or a stiff
piece of wire will also work)
[15] (1) 2000 ohm headset (or a mini-
ature earphone like most tv
and radios use)
the parts can be purchased from radio
shack for less than $20. This is a
very good high-gain meter-type bug
detector. It has a crystal diode with
2 amplification stages to boost the
power of the meter. This produces a
broad-band, battery-powered, receiver
that can sense radio-frequency transm-
itters up to a mile away. Unfortun-
ately, it will also pick up a commerc-
ial am or fm station up to 3 miles
away....
Bug detector schematics:
[14] [1]
(*)-----+------\<---+------+----\
\ \ \ \ \
\ \ \ \ \
\-/ ( / [7] \ \
v ) [3] \ --- \
[11] ( / ^^^ \
[0] ) --> \ \ \
\ \ / \ \
\ \ \ \-/ \
\-/ \ \ v \
v ----+ \
\ [0] \
[0] \ \
\-/ \
v \
\
[0] \
\
\
---------------------------------------
\ /----\
\ ( /--)-----------\ --->>b<<
\ ( \/ ) \ \
------(---\ ) \ \
( \\ ) ----+---\
( <--)-----\ \ \
[2] \----/ \ \ \
\ \ \
\ / \
[0] \-/ \ \
v / \
[4] \ \
/ \
\ \
\ \
>>a<< \
\
\
---------------------------------------
\
\ [12] [8&9]
\ ____ <-><+>
\ / \
---------() ()-----\ \---->>c<<
\
[4]
>>a<<--------\/\/\/\/\----->>c<<
---------------->>d<<
\
[2] /---\-----\
( \ )
( \-\ )
>>c<<----(---\ \-----)----\
( \-->-\ ) \
( ) \
\---------/ \
[0] \-/
v
[5]
>>b<<-------\/\/\/\/\---
^
\
\
------------>>d<<
[6]
>>d<<-------/\/\/\/\/--
^
\
\
Uploaded to: The Party Line
(415) 447 - 0963