This circuit produces a pulse when the voltage in the regulator exceeds a certain value depending on the components. PUT is not a common component today. The circuit is from a 1970 EEE.
This circuit was found in a RCA documentation from 1977. The integrated circuit is uncommon today. It is...
This circuit was originally suggested by General Electric in 1966 documentation to power...
This receiver was found in a 1968 publication, but can be mounted with a BC548 and BC558 in place...