Automatic volume change with the ambient noise control circuit


Posted on Mar 28, 2007

Automatic volume change with the ambient noise control circuit In the set of all car stereos and the like, the high speed and low speed driving or stop driving state, ambient n


Automatic volume change with the ambient noise control circuit
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oise is different, different requirements for volume, fixed volume adjustment method will affect the listening effect. The circuit uses microphones detect ambient noise, automatic adjusting circuit according to the environmental noise sound volume will be satisfied with the results. The circuit shown in Figure circle. Circuit, the signal pickup (MIC) were detected by the feet and the lC input pin, the limiting amplifier, noise detection and detection waveform into AGC voltage, feet and legs inside the main amplifier gain control, ambient noise becomes large, the gain of the main amplifier is increased, and vice versa becomes smaller.




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