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 was released in a Radio Electronics issue in November 1983. It is an accessory to be...
This Electronics Now circuit provides a signal when the voltage of a source drops below a...
The number of pulses produced by this circuit depends on the switch pressed. The circuit is from...