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Circuit help needed

Discussion in 'General Electronics Discussion' started by JackRabbit, Feb 15, 2011.

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  1. JackRabbit


    Feb 15, 2011
    I am working on a project that uses an alarm clock to trigger an controller. My problem is that the alarm clock goes off and im using the speaker to trigger the control. My problem is that the speaker is putting out a square wave that isnt powerful enough to sustain a signal to the controller . I have thought about using relays to communicate between the two but I was looking for an easier route.

  2. rob_croxford


    Aug 3, 2010
    Is your alarm clock digital or analogue??
  3. Laplace


    Apr 4, 2010
    Is one side of the speaker grounded? You could use a low power Schottky diode to rectify the speaker signal then feed it to a low pass RC filter and use a comparator to sense the voltage level. Use the output of the comparator to drive the controller.
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