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A sound meter kit or an optical level meter is a device that determines and reveals the level of sound intensity by turning on a larger number of light-emitting diodes; So that if you assemble this kit and place it on the speaker of your radio or music system, with the intensity and power of the output sound, the light emitting diodes or the LEDs of the circuit will light up more and create a beautiful effect and display. As the sound goes up and down, the LEDs also light up along with the music like a dance of light, which is actually an optical graph.

With the anti-reverse connection protection diode, it effectively prevents the reverse connection of the power supply polarity to the burn circuit. Also, with the built-in microphone, there is no need to connect the audio cable, and the sound sensitivity can be adjusted with the potentiometer.

Educational note: LED Bar Graph is actually an arrangement of LEDs that is used to connect to an electronic circuit or microcontroller and has many applications.

It can be placed next to the computer, next to the TV, next to the Bluetooth speaker, next to the car screen .

Voltage: DC 5-12 volts

Voice recognition: by microphone

Sensitivity adjustment: potentiometer adjustment

Working current: Static: ≤15mA; Dynamic ≤120mA

Power interface: USB to DC3.5

Flashing mode: it lights up from top to bottom depending on the volume

Circuit board size: length 160mm * width 18.5mm

LED colors: 14 green, 4 yellow, 2 red