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LIE DETECTOR

This circuit detects the
resistance between your
fingers to turn the 4 LEDs.
As you press harder, more LEDs
are illuminated.

 

A GOOD SPY BUG RAIDEO CIRCUIT

This circuit uses a TUNED CIRCUIT or TANK CIRCUIT to create the

operating frequency. For best performance the circuit should be built on

a PC board with all components fitted close to each other. The photo

below shows the components on a PC board:

INCREASING THE RANGE OF FM BUG

To increase the range, the output must be increased. This can be done by using

an RF transistor and adding an inductor. This effectively converts more of the

current taken by the circuit (from the battery) into RF output. The output is

classified as an untuned circuit. A BC547 transistor is not suitable in this location

as it does not amplify successfully at 100MHz. It is best to use an RF transistor

such as 2N3563.