Filter analyzer (CB8227E)

Found in a 90s Popular Electronics, this circuit is interspersed between the filter and the oscilloscope input for analysis.

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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...