This circuit uses an optical coupler called Raystor created by Raytheon in the 1960s. The circuit uses components from the era that can be changed. The current is low.
This is the typical audio amplifier for a 1967 television. We found it in a magazine from the...
This circuit is from an English magazine from 1980, but it can be easily assembled with more...
This circuit was suggested by a 1967 General Electric manual. The waveforms of the generated...