一、超外差收音机概述在收音机领域,超外差克服了直放式的一些致命弱点,而独占鳌头.几十年来,它不但给国人奉献了五花八门的中、低档晶体管收音机和集成电路收音机,而且孕育了一代又一代高档收音机及多用机.从电路结构分析,超外差收音机主要由输入电路,变频电路、中放电路、检波电路、自动增益控制电路、低放电 A super-heterodyne radio overview In the field of radio, super-heterodyne overcame some of the most direct weakness of the direct-release, and come out on top. For decades, it not only to the Chinese dedicated to a wide variety of low-end transistor radios and integrated circuit radios, and Gave birth to generation after generation of high-end radios and multi-purpose machines.From the circuit structure analysis, superheterodyne radio mainly by the input circuit, frequency conversion circuit, in the discharge circuit, detection circuit, automatic gain control circuit, low discharge