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 bidirectional optical switch detects the direction of movement of an object that passes...
This low-frequency circuit for alternating signals is from an early American 1980s documentation. The...
This configuration was found in the January 1992 Radio Electronics magazine. The frequency is set...