This circuit was found in a Radio Electronics from February 1966. With it it is possible to trace the curve of a tunnel diode visualizing it on an oscilloscope.
This circuit is from a publication by Newton C. Braga in the United States. The transistor can be...
This circuit is from an old publication from the 70s, but it can be implemented with modern diacs...
This circuit is recommended for alarm systems since it has a good output stage. The circuit is...