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555 ic+output pulse after trigger pulse ends

Discussion in 'Homework Help' started by Mindmywork, Mar 12, 2018.

  1. Mindmywork

    Mindmywork Member

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    im working on a circuit which will be triggered by cell phone audio output. im able to amplify the audio signal, the voltage has spikes in it from 1.6 to 4.5v when the ringtone is playing.
    so can i take it as a input to 555 and get a pulse of 5 seconds as output.

    output pulse should start after the ringtone ends.
     
  2. crutschow

    crutschow Well-Known Member Most Helpful Member

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    You mean when the ringing totally stops or at the end of the first ring?
    If at the end of the ringing, what is the period between rings?
     
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  3. alec_t

    alec_t Well-Known Member Most Helpful Member

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    How long does the ringtone last? Does it have gaps in it?
    You might find you need two 555s: one triggered at the start of the ringtone and the other triggered when the pulse from the first one goes low.
     
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  4. dave miyares

    Dave New Member

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  5. Mindmywork

    Mindmywork Member

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    after total ring stops. like i will call the mobile the ringtone plays and stops, after the ringtone stopped the output has to be triggered.
     
  6. Mindmywork

    Mindmywork Member

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    good idea. cant we do it with just a single 555
     
  7. Mindmywork

    Mindmywork Member

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    ringtone can be selected from files. but i dont know which sound form will get high voltage and has small spikes.
     

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