We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994. The circuit can be adapted to use other operational amplifiers and the power supply must be symmetrical.
This simple unijunction circuit is from a Radio Electronics from July 1963. It can be assembled with a...
Using 555 integrated circuits, this alarm circuit was found in a 90s American documentation. The signal...
This circuit with transistors was found in an old Japanese publication, translation of an American...