150MHz Frequency band narrow band frequency modulation wireless receiver
Author: Chen Chunming 03xin3
Instructs teacher:Wu Guisong adjunct professor
(Huizhou electronic science department, Guangdong, Huizhou, 516007)
Abstract
This design is by the input tuning circuit, the high-frequency amplification electric circuit, this inspires the electric circuit, the mixing filter circuit, center puts the warning frequency integrated circuit, the audio frequency merit puts the frequency modulation which unit electric circuit and so on electric circuit is composed to speak the receiver. The integrated circuits of the design have MC3361 and LM386.They are the core of the circuitry. This design selectivity good, the sensitivity is high, may receive the frequency range is 150MHz. Through to the frequency modulation intercom installment and the debugging, can to has studied the high-frequency circuit principle knowledge and various units electric circuit electric circuit form, coupling way and the signal transmission profile and the result between various electric circuits, have a more thorough understanding. At the same time, also to before has studied various types simulation unit aspect knowledge and so on electric circuit principle of work, electric circuit form, debugging method, survey technology, entire machine electric circuit skill, is under comprehensively, the system training. For will be engaged in this specialized work to lay the solid technology base from now on.
Keywords
MC3361;mixing;local oscillation;frequency discrimination