Based on a unijunction transistor, this circuit was found in the January 1994 issue of Electronics Now magazine. The frequency range depends on C1, which can be changed.
LEDIL provides through Mouser Electronics a series of lenses for use in greenhouse horticulture....
This timer for time intervals of up to a few minutes was found in an English publication in 1965....
We found this circuit in an American 1980s documentation. The circuit can be assembled with modern...