Wireless Microphone Circuits

Colpitts 1 to 20 MHz Crystal Oscillator

FM Wireless Mike: low power frequency modulated transmitter using two transistors. The circuit works with 9v power supply.

Micro Spy With FETs

Micro Spy With TTL

Micro Spy With USW

Miniature FM Transmitter #1

Miniature FM Transmitter #2

Miniature FM Transmitter #3

Miniature FM Transmitter #4:

Miniature MW Transmitter: circuit diagram of simple medium wave transmitter using BF494B. This simple transmitter have a range of 200 meters.

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