Function: 1. The filter board can be used to create an audio analyzer for the frequency information of music so that your controller can interact with the music. 2. Used to capture the music spectrum, create interactive music robots, process audio data, create special lighting effects, voice analysis, etc. 3. The typical amplitude of the input signal must be 20 dB, and a potentiometer for adjusting the input amplitude is available. 4. The audio signal is filtered through this module into 7 frequency bands, namely 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz and 16 kHz. 5. The filter board is powered by 2 digital ports and 1 analogue port and is equipped with cables and audio plugs for easy operation. Specification: Item Type: Filter Board Material: PCB Working Voltage: 5V Drive Interface: 2 x Digital Connector, 1 x Analog Connector Principle: The audio processing is an audio signal analysis IC based on the graphic equalization filter MSGEQ7. The audio signal is filtered through this module into 7 frequency bands and can output the amplitude of each frequency band. The 7 frequency bands are 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz and 16 kHz. Package list: 1 x filter board, 1 x cable, 1 x audio plug, 11 x module accessories, 1 x wiring diagram. Note: Please use within the parameter voltage range.