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 is a complete version of the previous circuit, with several scales and two transistors, one...
This sensitive circuit produces na outpu signal when a body is detected by the sensor. The circuit...
Found in a 1966 American publication, this circuit invert the phase of a low frequency signal. The...