We found this circuit in a Linear Technology documentation from the 90's. Check the availability of new equivalents for the integrated if you need a new project.
This power control from Motorola's 1971 SCR Power Control Fudamentals can control full wave loads...
The transistors can be the BC548 and BC558 and the operational can be a 741. The circuit is from...
This circuit can be used to receive signals from CB18636E and other modulated light transmitters in this...