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4029 Counter

Discussion in 'Electronic Basics' started by Data888, Jul 31, 2003.

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  1. Data888

    Data888 Guest

    I've been messing around with digital electronics over the last couple
    of days and I seem to have run into a problem.
    I have a 5v power supply (basically built from the instructions here: ), except I
    used a DC plugpack, so I omitted the rectifier diodes.
    I built a circuit to eliminate switch contact bounce using a 4049 (shown
    ), and connected the output to the clock of a 4029 counter.
    I put 4 LEDs running through 1k resistors on the outputs of the 4029,
    and when I turn the power on they seem to turn on randomly, but when I
    push the button nothing happens.
    I have the 5v supply going to the Vdd pin, the Vss pin grounded, the
    UP/DN and BIN/DEC pins high (5v supply).
    Any ideas what I've done wrong? Thanks

  2. Nick,

    I believe you forgot to tie CIN and PE to a logical low level (ground).

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