Published:2011/7/13 8:06:00 Author:Michel | Keyword: VHF-band, FM Circuit | From:SeekIC
Circuit's Functions
The frequency modulation FM transmitter which can be used in 76~90MHZ FM radio band, usually also it is called wireless microphone.It adopts signals via FM radio receiver.The signals can be transmitted in wireless means if we don't use the microphone but input low frequency signals.The transmitting distance can reach over 30 meters if the 60CM antenna is used.
Circuit's Work PrincipleThe TT1 makes the signal generated by the electret capacitor microphone amplify to diode's work voltage.80MHZfrequency band signal is generated by LC oscillation circuit and it is showed as the picture.The Oscillation chart L's strcture:The lead is winded to the reel with magnetic core and the oscillation frequency alters among 6~90MHZ by adjusting magnetic core.
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