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 circuit uses only passive components calculated for the desired frequency. We found it in an...
This unijunction relaxation oscillator can be used as a very useful signal injector. The circuit is...
Found in a 1965 Electronic Design, this circuit divides the frequency of a 50 MHz signal by 2. The...