16-Channel 5V Relay Module with Optocoupler & LM2576 Buck Regulator

Overview 

The 16-Channel 5V Relay Module is designed for high-load switching projects where reliability is non-negotiable. With 16 individual relay channels, you can control lights, pumps, motors, and solenoids simultaneously. The onboard LM2576 Buck Regulator is a standout feature—it efficiently manages the power supply to the relay coils, preventing the voltage drops commonly seen in cheaper relay boards that rely on standard linear regulators.

Key Features 

• Optocoupler Isolation: Provides complete electrical separation between your sensitive microcontroller (Arduino/ESP32) and the high-power relay side, protecting your board from back-EMF spikes.

• LM2576 Regulator: Ensures the relay coils receive a constant, stable voltage, preventing chattering or failure during high-load switching.

• High-Current Handling: Each relay is rated for heavy-duty switching (up to 10A at 250V AC).

• Flexible Logic: Supports high or low-level trigger, making it compatible with almost any microcontroller architecture.

• Visual Status: 16 independent indicator LEDs provide real-time feedback on which relays are active.

Technical Specifications