This circuit was found in a 1967 General Electric manual. It shows a SCR control with unijunction and zener diode. The triac depends on the controlled load.
This two-transistor amplifier stage has a feedback network allowing a voltage gain between 10 and...
September 2016 - can already be found at Mouser Electronics new integrated circuit from Texas...
This one-transistor alarm can be used with much more sensors than the two shown by the figure....