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.
We found this circuit in a 2001 publication. It consists of a system that automatically discharges a...
This third-order Butterworth filter was found in American documentation from the 1980s. Formulas for...
This circuit that drives an electromechanical counter of the time was found in Radio Electronics magazine...