3-way control (CB7047E)

This is a simple circuit to control a set of lamps from 3 different points. We found it in an old Popular Electronics.

Signal Injector (CB1385E )
This traditional signal injector from a 1970s publication uses germanium transistors. We can mount it...
Phone noise canceler (CB9402E)
This circuit was found in a 1967 American documentation. The circuit uses components of the time,...
Algebraic Comparator (CB6492E)
Found in a 1964 Electronic Design this circuit compares two signals by providing the inverse of the...