Circuit for 'chirp' sound?

Discussion in 'The Projects Forum' started by Lee697, Sep 1, 2014.

  1. Lee697

    Thread Starter New Member

    Aug 31, 2014
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    I'm planning a new rocket igniter, I want to incorporate an audible alert on starting the ignition timer.
    Basically a momentary button is pressed to start a monostable 555, at the end of its time period it triggers a second monostable 555 to conduct to the igniter via a MOSFET.
    The countdown period is 5s or so, but I don't want a 5s tone, just an audible 'chirp' or beep....

    Can anyone suggest an easy way to do this??
    I know I could do what I want by triggering a second pair of 555's off the output of the first one above, but seems a bit clunky....

    Thanks
    Lee
     
  2. GopherT

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    Nov 23, 2012
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    upload_2014-9-1_9-17-53.png
     
  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Last edited: Sep 1, 2014
  4. bertus

    Administrator

    Apr 5, 2008
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    Bernard likes this.
  5. Lee697

    Thread Starter New Member

    Aug 31, 2014
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    Thanks Gents....
    You just have to know what to search for....
    Might be easier to just use a 556 I think!
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    bertus, yours works better for same ckt.
     
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