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The wireless emitter microphone circuit--high sensitivity mi

2016-11-07 22:52  
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The wireless emitter microphone circuit--high sensitivity microphone circuit production
The circuit is simple and cheap, whose output power is not higher than 5-8mV, the emitting range is about 300m in citizen area, the signal is received with a FM radio, which indicates its good sensitivity and clearance, the most challenging part of designing the circuit is making a 3V power supply and a half-wave aerial have this emitting capability. Besides, as the circuit needs few elements, so the circuit can be put in a match box (which is a little bigger than the local match box) as the wiretap.