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2001 national college student electronic design competition "SONY cup" winner - FM radio
This FM radio is mainly composed of SONY's FM/AM radio chip CXA1019, ROHM's PLL frequency synthesizer BU2614 (which provides information on the chip on our website) and a single chip microcomputer. System with single chip microcomputer AT89C51 as the control core, realizes the full frequency search, specify the frequency range of search and manual search the introduction of the numerical control potentiometer X9511) make the volume continuous adjustment without sliding noise LCD display information such as carrier frequency and the clock with DC - DC voltage converters, so the stable work under 3 v power supply in order to achieve the radio storage capabilities, using E ~ 2 ROM (AT24C04), is not afraid of power, and can store multiple stations on this basis, also increased the stereo decoding, make the voice more sweet, lifelike. Project demonstration and comparing 1. Tuning mode selection and demonstration project of the LC tuning method is adopted, through mechanical adjustment in the local oscillator circuit capacitance value of the resonant circuit to change the natural frequency of vibration, so as to achieve the goal of tuning. This kind of tuning mode circuit is simple, but the frequency stability is poor, and it is not good for the use of microcontroller for intelligent control.