Adafruit Electret Microphone Amplifier – MAX4466 with Adjustable Gain Mornsun LM100-22B48 AC/DC 100W Enclosed Switching Power Supply Pin Diagram of SIM7600EI:

Pin Diagram of SIM7600EI:

1x Plastic Covered Battery Cell Holder (4 AA configuration)

and door locks operating at variable voltages

try a different USB port or powered USB hub to rule out power delivery issues

and interference issues common in Bluetooth speakers

Adafruit Electret Microphone Amplifier – MAX4466 with Adjustable Gain Mornsun LM100-22B48 AC/DC 100W Enclosed Switching Power Supply Pin Diagram of SIM7600EI:Adafruit Electret Microphone Amplifier MAX4466 with Adjustable Gain The Adafruit Electret Microphone Amplifier with MAX4466 is a precision analog audio amplification module designed to capture and amplify weak microphone signals from electret condenser microphones with variable gain control. This module is extensively used by embedded systems engineers, IoT developers, and audio hobbyists who require reliable sound detection and voice recognition