Can a NE567 be used to show higher/lower than center frequency ?

Discussion in 'The Projects Forum' started by Externet, Sep 6, 2014.

  1. Externet

    Thread Starter AAC Fanatic!

    Nov 29, 2005
    759
    57
    Hi.
    The intention is to use a NE567 that will turn a LED on when frequency is 60Hz +/- 5Hz and two more leds for frequency being lower and higher.
    Does the NE567 has any pin useable to tell if input is under or over the center frequency ?

    It is for a adjusting the engine governors in portable generators, to be built in a wall wart case.
     
  2. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    I only see a, "yes" output, not a high or low indicator. I'm sure you can use a phase locked loop to give you an error signal, high or low, but not this one.
     
  3. alexfreed

    Member

    Oct 8, 2012
    72
    10
    The simplest in terms of parts count and most accurate solution will be a micro-controller. Only 3 LEDs and an optional quartz crystal needed. Count the clocks between zero crossings of the input. Compare to proper period.
     
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