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Smart hearing aid

Discussion in 'General Electronics Discussion' started by rahila, May 26, 2012.

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  1. rahila

    rahila

    11
    0
    May 26, 2012
    i am using the EFY.COm magnizes smart hearing aid circuit can u pls help me to explain how the circuit works.it say it save the battery power ,it has a sound detection circuit and sound amplifier circuit in it
     
  2. davenn

    davenn Moderator

    13,813
    1,945
    Sep 5, 2009
    hi rahila
    welcome to the forums :)

    have you got a link to that page with the specific project or can you post a image of the circuit diagram in this thread ?
    it would help to know what we are looking at :)

    cheers
    Dave
     
  3. rahila

    rahila

    11
    0
    May 26, 2012
    i have upload the circuit which i am building kindly explain how it works
     

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  4. GreenGiant

    GreenGiant

    842
    6
    Feb 9, 2012
    the document fairly well explains itself how it works

    there is a reference voltage on the LM324, which acts like a comparator for the voltage generated by the microphone (which is amplified), if it gets above a certain volume (voltage) it turns on the amplifiers for the headphones for a preset amount of time (based on sizes of a capacitor and a resistor connected to the 555 timer) then it shuts off until the sound goes above a certain point again.
     
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