Found in an American documentation from 1969, this astounding circuitry makes a relay operate on 3 Hz cycles. The relay is of the high voltage type of the time.
This circuit was found in documentation from the 80s. It is based on unijunction transistors not...
The speed of the motor connected to this circuit depends on the amount of light that strikes the...
This sensor circuit from a 1967 Ferranti documentation uses components from the era. The circuit...