This circuit was found in documentation from the 80s. It is based on unijunction transistors not very common today being synchronized by the 60 Hz power grid.
We found this 2-transistor circuit in Radio Electronics magazine from July 1961. The circuit is...
This circuit shows how to use the remaining gates of a 4093 or 74C14 as amplifiers. The circuit has...
In fact, this circuit found in a Japanese publication from the 1960s will work with any...