We found this circuit in 1967 General Electric documentation. SCRs can be replaced by current equivalents. The circuit is for 110V power grid.
The recommended distance between the emitter and the phototransistor is 10 mm for this...
August 2016 - It can be obtained from Mouser Electronics Mikromidia of the MikroElektronika...
The circuit shown in the figure is suggested by National Semiconductor and makes use of an...