Production of full channel frequency modulated receiver ----- FM Radio

Keywords: full-channel frequency modulated receiver production The receiving head introduced herein is only used with one integrated block and a power supply voltage at + 5V, which consumes less, easy to carry, and truly realize the pocket of the receiver. The working principle is shown in the drawings, the high frequency header is amplified and mixed with the signal received by the antenna, and the 31.5 MHz of the 31.5 MHz generated after mixing is output from the IF1 end, into the IC (12) foot. After the IC is amplified, it is mixed with 42.2MHz second local resonance, generates 10.7MHz second intermediate frequency signal, and is filtered into IC (17) foot after filtering with 10.7 MHz triplet filter, and then released by IC, after demodulation, enter The (24) feet of IC, and finally drive the speaker work after the IC internal power amplifier. The power supply required for this high frequency header also uses a boost circuit composed of a triode 2SC8050 and a high frequency transformer to provide operation and tuning voltages. Due to the high frequency head of low voltage power supply. Its supply voltage can be obtained low, and the experiment proves that the power supply voltage can be operated at around 3.6V, which can be powered by three-section nickel-hydrogen charging battery or a 3.6V lithium battery. Component selection: The selection of high-frequency heads is critical to this machine. It should be used to select high sensitivity, low voltage power supply, and small volume of high frequency heads TDQ36-5V, TDQ36-5V leader name and voltage are shown in Table 1. Note that this high frequency head has two signal output, IF2 is not. Us only IF1. IC uses the FM modiscus radio special integrated circuit CXA1O19 produced by Sony, Japan, where only the frequency modulation section, it uses a 28-foot dual-column-in-in-line package, each pin function is shown in Table 2. The CXA1019 is fully equipped, including all circuits of the FM modiscies, with less peripheral components, power consumption, high sensitivity, small distortion. The tuning potentiometer w selects a 100kΩ multi-circular precision potentiometer, and there is a miniature digital voltmeter between the high frequency head VT and the ground to display the local reception frequency to achieve the native miniaturization. High-frequency transformer B1, oscillating coil B2 selected the medium TRF1445, B1 no need to change, B2 disassembles a circle. The remaining components should also be miniaturized as possible. This machine is very simple, just adjust B1, B2 can be different from 10.7 MHz intermediate frequency signal. The receiving head can receive a rod antenna on an ordinary radio to receive a total of all FM radio stations and television audio signals. Author: Zhouhu

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