Opto control for triac (CB20552E)

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

Video Amplifier (CB4209E)
This old two-stage video amplifier uses integrated circuits that are not easily obtainable today. The...
7-segment display driver (CB20551E)
We found this circuit in English documentation from 1996 for PCs. The circuit is for common...
60 Hz Filter (CB6025E)
This circuit is based on a Texas Instruments LinMOS integrated circuit consisting of an...