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Spy Circuits
Strona 4 z 46
illuminate.
So far we have seen an unstable Circuit in action. Piacing a finger near the bug will change the frequency. Thi; unsuitable.
A ONE TRANSISTOR CIRCUIT
The next Circuit uses a TUNED CIRCUIT or TANK CIRCUIT to create the operating frequency. This is clearly diagram. For best performance the Circuit should be built on a PC board with all components fitted close to ea below shows the Circuit using a coil etched on the board. This type of coil is totally unsuitable. It does not have rangę is very poor. The board cannot be touched as the capacitance of your body causes the Circuit to drift. A improve the stability considerably. See photos below for the details of a wound coil.
Antenna
mk:@MSITStore:F:\spy circuits.chm::/SpyCircuits-l.html
2011-12-08
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