Primary Purpose

Detects sound presence/amplitude (not for high-fidelity audio recording).

Output Type

Digital (DO) or Analog (AO), depending on the model.

Sensitivity

Adjustable via potentiometer (in most modules).

Frequency Response

Limited (typically 50Hz–10kHz).

Signal Processing

Basic (sound detection or threshold triggering).

Interface

Digital (DO) / Analog (AO) (Arduino-compatible).

Power Supply

3.3V–5V (common for DIY electronics).

Key Components

Electret microphone, LM393 comparator, amplifier circuit.

Common Applications

Clap switches, noise-activated triggers, simple sound-reactive projects.

Example Models

KY-038, LM393 Sound Sensor.