************ CAR TRACKER *************
 Uploaded By: The Phoney Phoner
               And The Skeleton Krew
**************************************

By: Ford Prefect

    "my name is bond, james bond."

My next gadget is what is called a
bumpbeeper.  It attaches to the under
side of a car with magnets and then
sends out a signal that can be heard on
a radio.

 Parts list: () = diagram #

    (1) 2n635a transistor
    (2) 4.3K 1/2 watt resistor
    (3) 1 meg potentiometer
    (4) 10k 1/2 watt resistor
    (5) 50pf capacitor
    (6) 365pf variable capacitor
    (7) .005Uf capacitor
    (8) .01Uf capacitor
    (9) ferrite loopstick (from a crys-
   (10) coil [see text]    tal radio)
   (11) single-pole single-throw switch
   (12) 9 volt battery
  (opt.) Battery clip & case
   (13) antenna

 this device is a constant tone signal-
ling source that can be tuned to any
clear spot below 1000 khz.  If magnets
are attached to the case, it can quick-
ly be installed under the persons car.
(9) Is a standard ferrite loopstick tha
t can be purchased at radio shack.
(10) Is simply 12 turns of plastic cov-
ered hookup wire wound over (9).

  13
  (*)-------\(----+-----______--- >>a<<
   \              \     ^^^^^^
   \        5     \       \   9
  ---             -\(--   --\(--->>b<<
   -           6      \   7
   v                  \
                      --->>a<<


 >>a<<------+------+------o/ o-----
            \      \       11     \
            /     ---             \
            \      -              \
            /      v              \
         4  \              --------
            \              \
            \              --[][]->>c<<
            --->>b<<          12

 "@�                                   j��  >>c<<----/\/\/\/\----+-----+-------
               2       \     \      \
                       \     \      \
       >>d<<---)\-------     \      \
                             v    >>e<<

              8      -----/\/\/\--
                     \       3
     >>f<<-----------+
                   /---\
                1 (  \  )
                 (   / /-)---->>d<<
                (   \  >  )
                 ( ----- )
                  (  \  )
                   \---/
                     \
                     \
                   >>b<<


 >>e<<-------
            \
            (
            )
            (
      10    )
            \
            ------>>f<<




>>d<<---
        \
       ---
        -
        v  (ground)

 to tune the transmitter:

 1)pick an empty spot on the am car
     radio below 1000 khz.
 2)Switch on the transmitter with the
     spst switch.
 3)Tune the 365 variable capacitor
     slowly until a shrill note can be
     heard from the car radio.
 4)The pitch of the note is adjustable
     by turning the 1 meg potentiometer

                        resistantly,
                        Ford Prefect

           Uploaded to: The  Party  Line
             (415) 447-0963


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