Kaush Sound Sensor Module - LM386 Amplifier, 4-12V DC

The module operates from 4V to 12V DC, making it directly compatible with common 5V Arduino boards and 3.3V Raspberry Pi systems (using a logic level shifter if necessary for the Pi's GPIO). Always ensure your power supply is within this range to prevent damage to the onboard LM386 amplifier.

The coarse adjustment potentiometer sets the overall sensitivity threshold of the sensor, determining the minimum sound level required to trigger a significant output change. The fine adjustment potentiometer controls the gain of the LM386 amplifier, allowing you to fine-tune the amplitude of the output signal for optimal ADC reading on your microcontroller.

The unfiltered output provides the raw, amplified audio signal directly from the LM386, which includes the full frequency spectrum and any inherent noise. The filtered output passes the signal through an additional RC low-pass filter network, smoothing the signal and reducing high-frequency noise, which is preferable for applications like sound level averaging or triggering.

This is a general-purpose audio amplitude sensor. It detects changes in sound pressure level across the human-audible frequency range but does not perform frequency analysis or filtering on its own. For frequency-specific detection (e.g., detecting a particular tone), the output signal must be processed by a microcontroller using an FFT library or digital filtering algorithms.