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INPUT level activated audio amplifier

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waqas5304

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level activated input

HI
i have designed a audio amplifier using LM386 IC.its working fine but the problem is the amplifier is ON all the time, due to which a very low hiss is audable is headset.i want that that LM386 gets ON only when a certian level of signal is detected on its input.i want that when a certain level of signal is detected on input of LM386 the amplifier should get ON.this wil help me in two things one power saving and second elemination of NOise.
kindly if someone knows help me post me a circuit or guide me
 

lm386 hiss noise

Is the amp hissing because it is just on or is it fed with noise causing the hissing when there is no signal? Just switching power to the LM386 on and off in a squelch manner may produce a pop in the headset which may be more annoying.
 

hi
sorry i am late because i thought that no one is intrested in replying . basically it is hissing.i want to get rid of this hiss noise.
 

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