counter logic

Discussion in 'General Electronics Chat' started by duxbuz, Apr 15, 2014.

  1. duxbuz

    Thread Starter Member

    Feb 23, 2014
    133
    0
    Hi

    I will try to explain myself as best as I can.

    I am trying to create a circuit that uses a counter.

    I want to use a switch for a manual clock cycling trigger. I am not sure if this is possible or whether other elements are required.

    I am using this counter:
    http://www.farnell.com/datasheets/1758138.pdf

    I have created a diagram that has all the same pins in order to illustrate.

    I have logic problems (as usual) with my circuit.

    I decided to make the simplest tester circuit for the IC to see if I am getting the correct logic ins and outs prior to connecting to my decoder.
    http://www.farnell.com/datasheets/1700457.pdf

    I have pull downs on most of the pins and am completely unsure as to this being the correct way to go.

    I want to be able to select an output with logic probe such as 1Q0 and cycle the clock and have the value of the 1Q0 change. This is what I presume would happen if it was correctly wired up.




    [​IMG]
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,442
    3,361
    You do not need pull-down resistors on outputs.

    You need to debounce the switch used as a clock input.
     
  3. duxbuz

    Thread Starter Member

    Feb 23, 2014
    133
    0
    Ok I will try this later

    Thankyou
     
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