This switching circuit for the power grid, featuring fast acting characteristics, was found in a 1965 General Electric documentation. Modern equivalent components can be used.
This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time....
This traditional crystal radio circuit, but which has a modern version with diode, was found in an...
This headphone amplifier using a pickup coil can be used as an extension for devices such as TVs,...