This highly sensitive light sensor was found in a 1970 General Electric documentation. The circuit can use the 2N2646 for the UJT and the phototransistor can be of any type.
This frequency division multiplexing signal decoding circuit is from a 1980s documentation. The integrated...
This sample and hold circuit is traditionally configured and uses an operational amplifier with...
Found in Elektor Electronics from the 90s, this circuit can generate signals from 1 kHz to 9 MHz,...