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本文介绍采用MC14541可编程定时电路构成的全CMOS数字转速仪。仪器原理图如图所示,该电路由转速信号检测头、定时电路、信号控制、计数显示四大部分组成。转速信号检测头采用霍尔开关集成电路。在被测转数的主
This article describes the use of MC14541 programmable timing circuit consisting of a full CMOS digital tachometer. The schematic diagram of the instrument is shown in the figure. The circuit is composed of four parts: speed signal detection head, timing circuit, signal control and counting. Speed signal detection head using Hall switch IC. The main measured revolutions