A Study on Design and Construction of a Digital Clock System

Abstract

Instead of showing the time by moving hands as in an analogue clock, this project's digital clock displays it digitally, in numerical form (i.e., in numbers). Using 555 timers, this digital timer circuit was designed and implemented, and the results are documented. The project's initial design criteria were to have a digital output, and to count from seconds to minutes and then hours. Either an op-amp or a 555 timer should be included. Research into analogue electronic circuits of a similar nature led to the discovery of a good starting point for digital circuits. A digital timer circuit was built utilising a 555 timer, 74LS90 binary counters, 74LS47 IC, and 7 segment display outputs.