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 is the typical audio amplifier for a 1967 television. We found it in a magazine from the...
This alarm is designed for doors and windows, but nothing prevents it from being used in cars,...
With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with...