Increasing frequency

Discussion in 'General Electronics Chat' started by Dritech, Jun 1, 2013.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Hi all,

    Is there an IC that can multiply the frequency of a DC square wave by 60Hz?? (i.e. if the input is 1Hz the output will be 60Hz, and if the input is 10Hz the output will be 600Hz)

    Thanks is advance.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    You can do this using a PLL chip with a divide by 60 counter.
    An 4046 chip is a PLL.

    Bertus
     
    Last edited: Jun 1, 2013
  3. MrChips

    Moderator

    Oct 2, 2009
    12,432
    3,360
    This can be accomplished with a phase-locked loop circuit.
     
  4. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Thanks for the help. Another question, is there a way to disable/pause the 7447 outputs??
     
  5. k7elp60

    Senior Member

    Nov 4, 2008
    478
    69
    If the out (pin 4) is shorted to ground will turn off the display. Since the outputs are normally low to turn on the segments, the outputs will go high when pin 4 is grounded.
     
    Last edited: Jun 1, 2013
  6. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Hi, but I don't want to turn off the seven segment display. I just want to freeze it. for instance lets assume I have a counter and the segment display is not in freeze, the counter will keep showing. When the 7447 is put to freeze, the counter will continue but the display will remain where it way.
     
  7. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Or else, is there a way to freeze the 7490 counter ?? without disabling or effecting the inputs.
     
  8. MrChips

    Moderator

    Oct 2, 2009
    12,432
    3,360
    What you need is a latch. A simple solution is to replace the 7447 with a 7-segment latch/decoder/driver such as 4511 or 14543.

    With the 4511 you will have to change your LED display to common cathode.
    The 14543 can be used with either common anode or common cathode display.
     
    Dritech likes this.
  9. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Thanks for the help MrChips.
     
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