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Strona 34 z 46
Spy Circuits
TELEPHONE BUG
Look at the coil. A floppy coil like this is totally unsuitable as it will be "telephonic." This means it will vibrate wl and will even pick up sounds such as talking, musie and footsteps and transmit them just like a microphone. I build this Circuit and use 7 turns of thin wire on an 8-1 Omm pen and see how the coil picks up every sound in t Simply connect a 9v supply and the Circuit will work. The coil should be 6t and 3mm diameter, using 0.5mm er wire.
Phone linę
23/7/11
Field Strength Meter _Mkl_
Essential for checking the output of our FM transmitters
This Field Strength Meter has been specially designed for our FM bugs. It is capable of detecting very Iow pa and will assist enormously in peaking many of our FM transmitters that have a coil in the output stage that cai optimum output.
2011-12-08
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