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 very simple circuit with neon lamps indicates who pressed the button first, lighting the...
The configuration below is suggested by the National Semiconductor Linear Applications Handbook. The...
This lie detector was obtained in a Japanese publication in 1967. The component with a different symbol...