This circuit was found in documentation from the 1970s. It eliminates contact bouncing, providing a single pulse. PUT is not a common component today.
Ordinary batteries cannot be recharged, but they can go through a process of "rejuvenation" that...
We found this basic circuit of a relaxation oscillator with unijunction transistor in a 1976...
This circuit, from a 2006 documentation, automatically controls the activation of a water pump, and...