Opto control for triac (CB20552E)

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

Astable MC3556 (CB14591E)
The integrated circuits used in this project are double equivalents of the well-known 555. The...
6 V x 50 mA Switching Power Supply (CB13504E)
This unit is intended for powering low consumption devices. The operating frequency is...
Treble Control (CB24006E)
These three circuits have different treble responses. We found them in the February 1970 issue of...