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Audio Power Indicating Circuit Using Five-digit LED Display(

2016-12-01 11:07  
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Audio Power Indicating Circuit Using Five-digit LED Display(FD502)
    The picture shows the audio power indicating circuit which uses five-digit LED display. The circuit consists of level meter driver FD502 and five-digit LED display. The circuit can take out the audio signal's positive range variation which will form direct current level, and then by measuring the variation of the direct current level, the indicating audio power can be known. If the audio signal is too low, FD502 can be altered to  FD501, which can drive LED after it is preamplified. FD502 and FD501 are domestic integrated circuits. FD501 has one preset amplifier and five comparators inside, while FD502 has no preset amplifier.