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Spy Circuits

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6 turns 3mm dia 0.5mm wire

^^Antenna

165cm

The buffer is taking excess current

7. EMITTERTAP

The following Circuit taps the emitter of the oscillator stage. We have already explained the collector or the emitter can be tapped and produce about the same results.

6tums 3mm dia 0 5mm wire

Artenna

165cm

Y

4v5

Tapping the emitter of the oscillator transistor

8. CLASS "C" OUTPUT

The following Circuit uses no biasing on the output transistor. It gets all the energy to activate the base from the oscillator stage.

While this is possible, the amount of energy needed is very large and the oscillator cannot provide enough energy to fully drive the output stage.

6turns 3rm dia 0 5mm wire

Antenna 65cm

TS\

4v5

Class "C" output

5 z9

2008-11-17 20 13