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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

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