The ultra-short wave package left reminding alarm circuit

Published:2011/7/6 2:14:00 Author:qqtang | Keyword: ultra-short wave, package left reminding alarm | From:SeekIC

The device consists of the emitter and receiver, which works in the FM wave. The principle of the emitter in shown in the figure, which is a multi-oscillator composed of the triodes (VT1 and VT3) and external components, the working frequency is 1000Hz, and the signal is picked out by C3, and modulated by the FM oscillator composed of VT3 and LC components, the modulated signal is output by C10, and emitted to the sky by the internal micro aerial, of which the function of C6 is to broaden the frequency band and avoid the human inducting effect on the frequency.



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