Digital Stopwatch 0 99sec
author : Pafilis Ioannis - Aristotle University of Thessaloniki Department of Electronics and Telecommunications In the present article , we will describe the function of a digital stopwatch , 0 – 99 sec . The function of the stopwatch , relies in the use of 4 integrated circuits, which in this case belong to National Semiconductor ( http :// www . national . com ). It is obvious that other integrated circuits can be used to achieve the same result, however in this case we have used the following parts : Α. 1 x CD4060BM (14 stage ripple carry binary counter) B. 1 x CD4040BM (14 stage ripple carry binary counter) C. 1 x MC14518B (BCD counter) D. 2 x MC14511B (BCD to seven segment driver) E. 2 x 7 segment LED displays The circuit that has been used is shown in picture 1. Through the experimental part we will explain each of the parts function, but in order to have a notion of the basic idea, let just say, that this circuit besides the 5V...