counter with flip flop

Discussion in 'General Electronics Chat' started by ShineDream, Nov 14, 2015.

  1. ShineDream

    Thread Starter New Member

    Nov 13, 2015
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    i wnant to to create a counter but i wanna to control it (when to increase - when to let it work work without any changes .
    i 'm a beginner so a serach and i founf a term "prescaling" but i can't understand.
    i could make the counter (with jk flip flop) but i don't know how to do this control
     
  2. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
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    Its not exactly clear what you're asking for help to do.

    Prescalers have a relatively narrow range of application - typical applications include reducing VHF+ signals to a frequency that regular logic in a counter instrument can handle, and dividing down the local oscillator un a UHF TV tuner so the front panel micro can calculate a channel frequency for the OSD.
     
  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    A prescaler is a very fast counter or other circuit that takes in a very high frequency and produces a lower frequency that more "normal" electronic circuits can handle.

    ak
     
  4. WBahn

    Moderator

    Mar 31, 2012
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    What does it mean for a counter to "work work without any changes"?
     
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,798
    1,103
    Can't you just use a counter IC (e.g. a CD4017)? Most have a 'clock-enable' or 'preset' or 'up/down' input to control the counting.
     
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