The synchronous addition counter 74LS 16 1 (or 74LS 160) and the 24-input NAND gate 74LS20 try to form an arbitrary decimal counter, and display the counting decimal with LED digital tube. The multivibrator circuit is composed of 555 timer, which provides clock input signal for synchronous addition counter.
Extended data:
Electronic counters can be divided into four categories according to their functions.
① General counter: measurable frequency, period, multi-period average, time interval, frequency ratio, accumulation, etc.
② Frequency counter: a counter specially used for measuring high frequency and microwave frequency.
(3) Calculation counter: a counter with calculation function, which can perform mathematical operations and can control all working processes such as measurement, calculation and display by programming.
④ Microwave counter: it is a microwave frequency meter consisting of a common counter, a frequency counter and a frequency measuring expander. The upper limit of frequency measurement has entered the millimeter wave band, and there are three types: manual, semi-automatic and automatic. Serialized microwave counter is an important aspect of the development of electronic counter.
Baidu encyclopedia-electronic counter