This circuit is from an article in Radio Electronics magazine from October 1958. The circuit is for testing electrolytics that operate at high voltages depending on the source.
This circuit was found in documentation from the 80s. It is based on unijunction transistors not...
This circuit is from a 1976 technical documentation, providing a high input impedance with low...
This circuit with germanium transistors was found in a Mullard manual from 1960. The components depend...