Specific digital frequency meter circuit schematic diagram

A digital frequency meter is made of digital circuits to measure the frequency of periodically changing signals. It is an indispensable measuring instrument in the fields of scientific research and production such as computers, communication equipment, audio and video. It is a digital measuring instrument that uses decimal numbers to display the frequency of the signal being measured. Its basic function is to measure sinusoidal signals, square wave signals and other physical quantities that change per unit time. During the design, installation, and debugging of analog and digital circuits, digital frequency meters are often used because they use decimal display, rapid measurement, high precision, and intuitive display.