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 memory flip-flop must be powered by 5V voltage. The circuit stores 1 bit. ...
This circuit was found in a RCA documentation from 1977. The integrated circuit is uncommon today. It is...
The output of this super-regenerative circuit must be connected to an audio amplifier. The coil...