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 TTL circuit uses LED indicators and must be powered by a voltage of 5 V. The capacitor...
This circuit was found in an English publication from 1989. The integrated circuits are of the...
Found in Radio Electronics from the 90s, this circuit has a power given by the output amplifier. The...