Digital Stopwatch With 7-segment Schematic

Posted on Feb 5, 2014

Stop watch is made with a digital timer IC LM555 and IC MM74C926 4 digit counter with multiplexed 7-segment LED. MM74C926 consists of4 digit counter, an internal output latch, NPN output for controlling the source of common cathode, 7-segment display and an internal multiplexing circuitry with four multiplexing outputs. Counter the negative edge

Digital Stopwatch With 7-segment Schematic
Click here to download the full size of the above Circuit.

clock face. Clock continually be produced by the timer IC LM555. The circuit works with a 5V power supply. It can be easily assembled on the PCB. Enter the circuit in a metal box with provisions for the 7-segment display, turn the switch S1, start / stop switch and reset switch S2 S3. Digital Stopwatch reset the circuit by pressing S3 so now the display shows `0000 `. Open switch S2 to stop watch to start counting time. If you want to stop the clock, close S2. Rotary switch S1 is used to select different time periods on the output of the astable multivibrator (IC1).

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Dc static switch
    Get Negative Rail With Cmos Gates
    Light Gate With Counter Using 555 And 4033
    Digital dice circuit
    Application Of Uart In Gps Navigation System
    Lithium battery charger schematic circuit design using LTM8061 IC
    Parameter Variation Machines
    TA2022 and TAS5010 digital amplifier circuit diagram
    AD590 basic application circuit d