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
    1
    0
    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?

    Thanks

    Ritch
     
    Last edited: Feb 2, 2014
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,504
    380
    hi,
    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'
    E
     
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