Circuits similar to this can be found in this section. This is from 1967 General Electric documentation. The main SCR must be fitted with a heat sink.
This circuit was obtained in a 1970 EEE and applies to almost any operational amplifier. The...
The circuit shown in the figure is suggested by National Semiconductor and makes use of an...
This circuit can function as a light alarm by changing the sound when light falls on the sensor....