Teardown of an eBay 25A Solid State Relay. (SSR)
About this video
You can now buy me cake and things to take apart at:- https://www.patreon.com/bigclive
A solid state relay is an industrial component used for interfacing low voltage control signals to high current mains voltage loads.
They sell them on eBay at a ridiculously low price, so it's time to see what's actually inside one of these eBay units.
Related article summary
A Raspberry Pi was integrated into a Gaggia Classic espresso machine to improve temperature stability and add features: PID boiler control via an SSR and PWM, digital temperature sensing (DS18B20 then TSIC306), pump control with SSR/IGBT for PWM pressure modulation, flow sensing for measured shots, ultrasonic water-level sensing, and an LCD touch display. Software uses PIGPIO and C++ threads; data logging and network access via Samba. Hardware and safety cautions are emphasized.