Audio Level Indicator Circuit Diagram. The circuit is unique because it has an additional range of 20db provided by an automatic gain control to allow it to be very sensitive to low sound levels but it increases its range 20db for loud sounds. The sensitivity of the audio level indicator circuit may be improved by varying the 220k potentiometer.
It is a popular ic and should be available from many parts stores. Audio vu meter this circuit uses two quad op amps to form an eight led audio level meter. The op amp used in this particular circuit is the lm324.
How to build sound level indicator this project uses an lm3915 bar graph ic driving two sets of ten leds for a 30db range.
The op amp used in this particular circuit is the lm324. This led consists of 10 leds to indicate the level of an input signal. The sensitivity of the audio level indicator circuit may be improved by varying the 220k potentiometer. Audio indicator this circuit can be used to remotely monitor a loudspeaker alarm or audio.
