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INput level detection circuit at input of amplifier

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waqas5304

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hi
it seems that no one is able to help me in this case.actually i have designed a audio amplifier with LM386.what i want that it should remain off till a certain level of input signal is dectected.in this way i can get ridd of continuos noise in headset
can anyone help me with good ideas or suggest me alternate
 

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