Opto control for triac (CB20552E)

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

Delay circuit (CB7545E)
This circuit was found in an Elektor from the 90s. Next to the circuit we have a table with the...
Isolator Using na Optocoupler (CB431)
This circuit isolates na áudio signal or digital signal up to 100 kHz, applying it to a gain 10...
Electronic Fuse (CB25411E)
This circuit was found in the December 1991 issue of Radio Electronics magazine. The circuit is...