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 can use a pendulum sensor. We found this configuration in a 1994 publication. The...
Obtained from a 1980s Signetics documentation, this circuit uses a common integrated circuit at the...
This is an interesting configuration obtained in an old circuit manual. The unijunction can be...