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Circuit Archives

Radio/ Transmitters


Wireless Microphone

Reprinted with permission from Rudolf Graf.
For this and over 1000 other electronic circuits, review and order Rudolf Graf's Encyclopedia of Electronic Circuits on CD-ROM Vol-1 McGraw-Hill ISBN0078528119
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FD103-2

 

Description: Wireless Microphone

Q1 amplifier the output from an electret microphone MiC1. Audio is fed into oscillator Q2, which modulates the signal. L1C1 is a tank circuit for operation in the 88-MHz region. The antenna is a 6-to 8-inch piece of wire. L1 is a variable inductor in the 1-mH range. (Reprinted with permission from Popular Electronics, 8/89, p.27. Copyright of Gernsback Publications, Inc., 1989.) From figure FD103-2 of Encyclopedia of Electronic Circuits on CD-ROM Vol. 1.

 

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