Opto control for triac (CB20552E)

Found a documentation for PC from 1992, this circuit is indicated for the English power grid of 240 V.

Irrigation Pump (CB18084E)
This circuit is from 2005 documentation. It automatically starts an irrigation pump when the...
Ohmmeter DM31D0UI (CB24784E)
This resistance meter circuit was found in the February 1984 issue of Radio Electronics magazine. It is...
Intelligent Emergency Lighting System (CB16904E)
In addition to keeping a battery constantly charged, this circuit only lights lamps when it is...