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近期市场上出售一种集收音、书写为一体的微型收音笔,其电路如图所示。它由一块性能优良的SD901软封装集成块和8只外接元件组成。SD901具有AM收音机从天线接收至音频信号输出的全部功能。各引脚功能是:①脚接
Recently sold a collection of radio, writing as one of the miniature radio pen, the circuit shown. It consists of a high performance SD901 soft package manifold and eight external components. The SD901 has the full capability of an AM radio receiving from the antenna to the audio signal output. The pin function is: ① foot access