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Spy Circuits

lt's a Circuit that looks to be ok.

But you have to go deeper into the designed to see the fauits.

The Microphone symbol shows the old-fashioned mic for a telephone.

It should be an electret mic symbol:

EI e ctret M i c ro p h o n e    kN

(Condensermic) &    k^-/

The 2k7 load for the microphone is too Iow. It will cause motor-boating. The load should be at least 47k.

The 47n across the microphone is not needed if the mic is biased correctly.

The 10u coupling to the base of the firsttransistor can be 22n.

The oscillator should be self-biased. This allows it to operate freely and maintain better stability.

The 100R in the emitter should be 560R as the BC547 can only handle a very Iow current at high frequency. The inductor should be specified as 5 turns of 0.5mm wire 3.5mm dia coil. The supply should be "decoupled" capacitor.

The 200n capacitor on the base of the oscillator transistor is too high. It should be 1n.

The 22n on the antenna is not needed.

Here's an FM transmitter with a number of mistakes.

It was designed by Harry Lythall of Sweden and I am surprised at the number of mistakes.

mk:@MSITStore:F:\spy circuits.chm::/SpyCircuits-l.html

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