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Dual display audio indicator circuit

2016-12-13 10:25  
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Dual display audio indicator circuit
This circuit indicates the audio frequency in the dual display mode, on one hand this circuit can drive a set of LED display in line. On the other hand, the changes of audio signal control these LEDs to change the brightness by six levels, the rhythm of brightness variation is changing with the audio signal. A set of LED uses these two kinds of display modes to get for better results.