在电子设备中,当要求改变分频电路的分频系数时,按传统方法,必须切换多根连接线,切换线路很复杂。本文介绍一种简便方法,用一只简单的开关,可以方便地选择任意分频值。在50kHz以下的频率范围内,工作稳定可靠。图1是原理框图。频率为f的时钟脉冲U_e被送 In the electronic equipment, when it is required to change the frequency dividing coefficient of the frequency dividing circuit, according to the traditional method, it is necessary to switch a plurality of connecting lines, and the switching circuit is complicated. This article describes an easy way to easily select any divider value with a simple switch. In the following 50kHz frequency range, stable and reliable. Figure 1 is a block diagram. The clock pulse U_e of frequency f is sent