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Spy Circuits

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The Circuit on proto-typing board - a quick way to build a project. The oscillator components must be kept near each other, otherwise the Circuit will not oscillate!

Some of the videos show how to build the Voyager Mkll FM transmitter and other transmitters in our series of One supplier of kits has STOLEN our design and marketed it as his own, claiming to have sold over 6,000 uni design has proven to be a "best-seller."

You will find some of the circuits are very poorly laid out and others just barely work at all. Most are a good ex TO DESIGN an FM Circuit and you will be able to learn a lot from these faulty designs. The secret to a good di compactness. A "tight Circuit" is a much-better performer.

The circuits we have discussed so far de mon stratę the maximum output that can be achieved from a 3v to 9v maximum sensitivity from the microphone.

The next stage in the development of a better Circuit involves a BUFFER STAGE so the oscillator is not drivin will give the Circuit morę stability and morę output.

The simplest buffer is shown in the following HAND-HELD MICROPHONE CIRCUIT:

HAND-HELD MICROPHONE

The following Circuit is suitable for a hand-held microphone. It does not have an audio stage but that makes it microphone, to prevent feedback. The output has a buffer stage to keep the oscillator away from the anten na. project the greatest amount of stability.

9 turns    9 turns \/ Antenna

Smmdia    3mmdia I 15 cm

2011-12-08

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