How can I make a solid state relay?

Thread Starter


Joined Dec 13, 2022

I want to create some solid state relays controlled by ESP32. The loads will be up to 15A (110v). So the live wire would enter in AC IN #1 and exit from AC IN #2 to be switched.

1. Do I need more resistors on the AC side? How can I know the resistance needed between the fuse and the optocoupler? I wrote 150 but I can be totally wrong. And do I need a 1/2W, 1W or more?

2. The capacitor on the DC side is needed?

3. I think I should add a snubber circuit because it would be used with different loads?

Thank you very much!