This sensor circuit from a 1967 Ferranti documentation uses components from the era. The circuit can be used as a shield, although the integrated one used is unusual today.
This circuit was found in a 1967 General Electric manual. It shows a SCR control with unijunction...
This circuit produces a low frequency magnetic field used in old inductive remote controls with a...
Found in an old Radio Electronics, this circuit is intended for the modulation of composite video...