This circuit was obtained in a 1967 Raytheon manual. The company's component is an optical coupler with a photo-resistor and a lamp. Transistors support equivalents.
This static switch circuit or solid-state contactor was found in a Motorola documentation from...
of the National Semiconductor of 1994. The same technique can be used with other operators and the...
Have you not yet memorized the color code used to identify resistors and capacitors? Do you have...