Designing a Single Channel Relay Module in KiCad (Part 1) Optocoupled Schematic Tutorial

In this video, we walk through designing a complete single-channel optocoupled relay module schematic from scratch using KiCad. This circuit features a PC817 optocoupler for galvanic isolation, an S8550 transistor driver, a 1N4148 flyback diode for inductive spike protection, and screw terminals for secure high-voltage wiring. Whether you're building custom IoT home automation controllers or standalone relay boards, this step-by-step schematic guide covers everything you need.Components used in this schematic: U1: PC817 Optocoupler Q1: S8550 Transistor D2: 1N4148 Flyback Diode K2: SPDT Relay J1 & J2: Pin headers and screw terminals Don't forget to like, share, and subscribe for more custom PCB design tutorials!