4027 toggle

Discussion in 'General Electronics Chat' started by richbrune, Apr 4, 2008.

  1. richbrune

    Thread Starter Senior Member

    Oct 28, 2005
    106
    0
    I'm trying to set up a toggle output with simply a cd4027BE, 12volt supply. I've got J and K tied to 12 volt, set and reset grounded, and the button between the clock and +12v. I'm having trouble and I think it's because I need some kind of resistors in the circuit.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You put your post on an expired thread. That's a good way to have it ignored.

    Is your button debounced?
     
  3. richbrune

    Thread Starter Senior Member

    Oct 28, 2005
    106
    0
    Nope. is a 555 the easiest way?
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Here are some various debounce schemes, it doesn't need to be that complex.

    [​IMG]
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Don't forget that the 4027 has TWO flip flops! You must have ALL unused inputs of a 4000 series CMOS IC tied to either Vdd or Vss, or your IC may oscillate unpredictably and overheat.
    You can connect them directly (hard-wired), or through a resistor - but they must not be allowed to "float".
     
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