The purpose of this circuit is to convert a short-lived pulse into a negative rectangular pulse. The circuit uses a unijunction that can be replaced by an equivalent such as 2N2646.
We found this circuit in an old publication. The circuit can be implemented with modern equivalent...
This circuit with transistors from a 1995 publication. The circuit is powered by a voltage taken...
This tiny photocell-powered audio oscillator was found in a book on transistors from the 1960s. The...