Opto control for triac (CB20552E)

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

600 mA Step down DC to DC Converter (CB15574E)
The circuit shown in the figure is suggested by Intersil (www.intersil.com) and makes use of the...
Negative Ion Generator (CB21000E)
This circuit was obtained from American documentation from the 1990s. The transformer can be a car...
Alternating Voltage Regulator (CB1581E )
National Semiconductor suggests the figure circuit for stabilizing the peak value of an...