The circuit shown was found in Intersil documentation from the 90s. The formula allows to calculate the voltage obtained as a function of the values of the resistors.
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...