Opto control for triac (CB20552E)

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

Passive tone control (CB9518E)
This simple circuit needs a high gain stage to compensate for losses. It consists of a passive tone...
555 Linear Ramp Generator (CB6357E)
This circuit appears elsewhere in this section and on this site. The circuit generates a linear...
Alternator regulator (CB7121E)
This circuit was found in Radio Electronics from the 90s. Q3 must have a heatsink and R10 fixes...