SSR latching circuit with push buttons

I'll use this circuit to build a safety paddle switch for my workbench.
Jun 29, 2020 — 1 min read — Electronics

SSR latching circuit with push buttons

I needed a way to power on the tools that I will mount to the underside of my workbench so I decided on using a solid state relay (SSR) and an industrial push button switch. Since the switch is only momentary, I needed a way to make it to latch so I build a small circuit for the job.

The circuit is built out of 2 transistors, one PNP and one NPN that work together to keep their state.

The output is controlled by two switches that will be the power on and power off buttons respectively.

Check out the video below for more details on the circuit and full schematic.

https://youtu.be/4oSe95wAq4c

workshop SSR workbench basic electronics latching switch
Bill Kolicoski
Written by: Bill Kolicoski
Blagojce (Bill) Kolicoski is a web developer with multiple domain knowledge gathered since he started in 2008, and he's got a real knack for all things tech, especially when it comes to building websites and fiddling with electronics. He's as excited about robots and space as he is about nurturing his garden at home. Bill is a dad who loves sharing his interests with his kids and readers alike, making sure every blog post is filled with easy-to-understand, useful info that shows just how fun and amazing the world of technology can be. His mission is to demystify technology for everyday people so they can be encouraged to play with it.
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