This is the circuit of an automotive voltage regulator from the 1970s. The circuit is entirely electromechanical based on the closing of a relay contacts according to the voltage.
This circuit is from an English magazine of 1974, but can still be assembled with the replacement of...
This circuit, using a unijunction transistor (UJT), converts a voltage applied to the input in a...
This circuit was found in documentation from the 80s. The circuit did not include resistors from...