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UP/ Down counter from 000 to 999 Not Working

Discussion in 'General Electronics Discussion' started by Thedatsun, Apr 27, 2013.

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  1. Thedatsun


    Apr 27, 2013
    I have a design for a counter that counts from 000 to 999 UP and Down on a LCD using a 555 timer to supply the signal CMOS ICs 4027 with a 4060 for the timing gate, 4029 Up/down counter, and 4543 for the LCD. However I am unsure why it will not count or at least display on the LCD. The only feedback I get is the blinking decimal and middle notches and not a full digit.

    The counter is set up based on the diameter of the wheel that will be used on a Tape measure which equates to A mod 6 counter because the amount of pulses per revolution of the wheel.

    Is there a problem with my Logic for the 4027 Gates?

    Can someone examine the circuit and tell me if it will count from 000 to 999 with a leading zero?

    Also can someone also tell me perferrably with a diagram how and where to wire in a Reset switch?

    Where to wire in LEDs (2) to show max and min terms ?

    Also where is the Phase A and B signal located in this circuit?


    Thanks in advance for the help
    Last edited: Apr 27, 2013
  2. Thedatsun


    Apr 27, 2013
    bump for help
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