Need a pulse counting switch

Discussion in 'The Projects Forum' started by ka9dvl, Feb 2, 2014.

  1. ka9dvl

    Thread Starter New Member

    Feb 2, 2014
    I've been searching circuits and latching relay info and can't seem to come up with anything.
    I want to take a multiple pulse (speaker output or Carrier signal) like clicking a microphone signal 5 pulses click,click,click,click,click and actuate a switch relay.
    Then I will take this signal to drive a timer relay for like 5 minutes
    The timer is no biggie and I can get a trigger signal out of a receiver and amplify it with no issue , But I can not come up with a pulse switch latch type relay

    Any-one have any good ideas or schematics?


    Last edited: Feb 2, 2014
  2. ericgibbs

    Senior Member

    Jan 29, 2010
    A simple HEF4017 counter would enable you select 1 thru 9 click pulses.
    The output pin of the 4017 could enable a CMOS 555 monostable, set for a 5 minute period.
    While the 555 is timing, it could energise your relay for 5 minutes, using a relay drive transistor, then the counter etc would be reset at the end of the 5 minutes ready for the next 'clicks'