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Smart hearing aid

rahila

May 26, 2012
11
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May 26, 2012
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11
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
 

davenn

Moderator
Sep 5, 2009
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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
 

rahila

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

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GreenGiant

Feb 9, 2012
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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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