In this 2001 circuit we have the way to trigger an SCR with a phototransistor. The circuit appears elsewhere in this section, obtained from publications from different eras.
This circuit is from a 1967 publication. The Triac can be any of the TIC series. The series...
This circuit was obtained in old documentation, but it is valid for modern triacs that must be...
This circuit charges a battery to power a flashlight at night. The circuit is from an English...