Found in Unitrode documentation from the 1980s, this circuit makes use of PUTs, currently common components. The circuit must be powered with voltages around 15 V.
This circuit was found in a 1967 General Electric documentation. The components are from that...
We found this circuit with several types of sensors in a 1995 documentation. The circuit also has...
This circuit was found in European documentation from the 1980s. The unijunction may be 2N2646 and the...