Figure7: The sound sensor for Arduino (LM393 op-amp). | Download Scientific Diagram
Sound sensor and sound detection module Arduino and other MCU
Prueba Sensor de Sonido LM393 para Arduino - Parte 1 - YouTube
Big Sound Sensor (KY-038) output to a audio sound speaker - Project Guidance - Arduino Forum
Amazon.com : Stemedu LM393 Sound Sensor Module - High Sensitivity Microphone Sound Detection Sensor with 3.3-5V Digital Onboard Potentiometer Led Indicator for Ar-duino (Pack of 5) : Electronics