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.

workshop SSR workbench basic electronics latching switch
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