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TUCoPS :: Hardware Hacks :: tbd.txt

The Bug Detector by Ford Prefect





                                      
      !!   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    



************ 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        
                                        
                                        
  >>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    
                                        
DOWNLOADED FROM P-80 SYSTEMS......304-744-2253


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