Opto control for triac (CB20552E)

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

Constant Current Source (CB1226E)
This constant current source from a 1980 publication can be used on a battery charger. Transistor Q1 may...
Power Outage Alarm (CB5952E)
We found this circuit very simple in an old documentation. The relay is high voltage sensitive, but...
Phase Shift Oscillator (CB25642E)
The network formed by resistors and capacitors determines the frequency of this sinusoidal...