This circuit with unijunction transistors was found in a documentation from the 80's. The trigger times of the SCRs depend on the capacitors and are adjusted in the 5M (4M7) potentiometers.
This precision circuit was found in ancient American documentation. The most critical component is the...
This circuit drives a load with a delay given by the RC timing components. The circuit is from...
This project is from a 1982 documentation, based on an astable multivibrator with two transistors. The...