1 (142)
Strona 3 z 46
Spy Circuits
pulse is amplified by the transistor and the Circuit is kept active.
The frequency is determined by the 6 tum coii. By moving the turns together, the frequency will decrease. Th' 90MHz. It has a very poor rangę and consumes 16mA.
THE SIMPLEST BUG
The components soldered to the 2 cells
Rear view of the simplest bug
After making a transmitter, you will want to know if it is transmitting. In the case above, the Circuit will only proc this will be heard on the radio as a "quiet spot"
Rather than chasing up and down the dial, Taiking Electronics has produced a piece of test equipmentto let is transmitting and the approx frequency of transmission.
It is called FIELD STRENGTH METER Mkll.
The photo below shows the Field Strength Meter near the bug. The piastic knob on the trimmer allows adjus-affecting the detecting Circuit. Simply tum the knob (with the two antennas near each other) and the 3 LEDs oi
2011-12-08
mk:@MSITStore:F:\spy circuits.chm::/SpyCircuits-l.html
Wyszukiwarka
Podobne podstrony:
1 (141) Strona 2 z 46 Spy Circuits These circuits are very powerful, in that they are very hard to d
1 (147) Strona 8 z 46 Spy CircuitsAN IMPROVED DESIGN This design uses a "sług tuned coil"
1 (149) Strona 10 z 46 Spy Circuits2 TRANSISTOR CIRCUITS The next progressive step is to add a trans
1 (161) Strona 22 z 46 Spy Circuits There is no evidence of the above Circuit de!ivering morę output
1 (167) Strona 28 z 46 Spy Circuits But it is often quite inconvenient to use a long antenna, so her
1 (173) Strona 34 z 46 Spy CircuitsTELEPHONE BUG Look at the coil. A floppy coil like this is totall
1 (176) Strona 37 z 46 Spy Circuits junction of the DC amplifier transistor only allowing ,6v to app
1 (185) Strona 46 z 46 Spy Circuits 100MHz rangę. If you are building our transmitters, a Field Stre
1 (181) Strona 42 z 46 Spy Circuits coil. Ali the othertransmitters have sufficient output to detect
1 (150) Strona 11 z 46 Spy Circuits magnetic field" and this occurs when the coil collapses and
1 (151) Strona 12 z 46 Spy Circuits - 5v for maximum output. The Voyager has been copied by many kit
1 (154) Strona 15 z 46 Spy Circuits To get good audio ampiification, and a stable oscillator and the
1 (157) Strona 18 z 46 Spy Circuits4. DIFFERENT COUPLING We have already mentioned the fact that a c
1 (159) Strona 20 z 46 Spy Circuits8. CLASS "C" OUTPUT The following Circuit uses no biasi
1 (160) Strona 21 z 46 Spy Circuits with frequencies around 100MHz. It seems the designer had diffic
1 (162) Strona 23 z 46 Spy Circuits When you fix these faults you will see how much improvement you
1 (163) Strona 24 z 46 Spy Circuits This covers all the possible combinations for the greatest outpu
1 (166) Strona 27 z 46 Spy Circuits corwert a high-voltage at low-current into a low-voltage at high
1 (168) Strona 29 z 46 Spy Circuits A Circuit diagram does not show the screening necessary to keep
więcej podobnych podstron