Opto control for triac (CB20552E)

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

Gain 50 Current Sensor (CB5388E)
We found this simple gain-50 current sensing circuit in a 2005 Linear Technology publication. The circuit...
Stereo Regenerative FM Radio (CB3828E)
This circuit, for its simplicity and the fact of using a super-regenerative detector only works...
Digital to Analog Converter (CB397)
This circuit source a voltage proportional to the number of the input pulses. The circuit has a...