本文介绍的数字频率计只用两块CMOS集成电路,几块CMOS-LED组合器件和一些分立元件构成,线路简单,精度较高,可满足一般音频范围测频需要.整机用一块电子表集成电路C4001、一块二输入端四与非门C036构成数字频率计的门控部分,用几块CMOS-LED组合器件CL102构成数字频率计的计数、寄存、译码和显示部分,用两只晶体管BG_1、BG_2 This article describes the digital frequency meter only two CMOS integrated circuits, a few pieces of CMOS-LED devices and discrete components constitute a simple line, high accuracy, to meet the needs of the general frequency range audio frequency measurement. The machine with an electronic watch integrated Circuit C4001, a two-input NAND gate C036 constitute the gated part of the digital frequency meter, with a few CMOS-LED combination device CL102 form the digital frequency counter counting, registering, decoding and display part, with two transistors BG_1 , BG_2