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Basic 3 Digit LED Decade Up/Down Counter1

Blog entry posted in 'General Purpose Circuits.', Feb 16, 2010.

0.00/5,
Basic 3 Digit LED Decade Up/Down Counter1 using 74LS192, 74LS247, Common Anode LED's and 555 one second timer.

The second circuit is for 120Sec up counter.

Added a 2 digit up/down counter with push button control.

Double Click the image to enlarge it.:)

Added a 2 digit up/down counter with preload and 1 sec timer.


3DecadeUpDownCntr1.gif 3DecUpCntr2a..gif

Attached Files:

julius atalip likes this.
  1. con-!
    dear Mr. Gibbs,

    I have created a digital clock using pretty much the integrated circuits you are using. Instead of using the timer as the clock driver for the circuit... how can a crystal oscillator be designed in order to drive the counter. I have tried many designes such as the Pierce oscillator, 4061 IC ans series RLS circuit but none of the function properly on the simulator.
    con-!, Apr 18, 2010
  2. glenn casiano
    How to make a circuit of an up down counter using 7 segment LED with the interfacing in the computer using parallel port........
    glenn casiano, Mar 26, 2012