As [Mic] often got requests to make high-power switching boards, he recently finally gave in and designed the one shown above based around a solid-state relay ... mains into an AC optocoupler.

the zero-crossing detection will wait until the AC signal crosses zero before switching. Another type of SSR, called a ‘random turn on’ solid state relay, is used to implement dimming.

Researchers at the Hong Kong University of Science and Technology (HKUST) have achieved a remarkable breakthrough in cooling technology with the world’s first kilowatt-scale elastocaloric cooling ...