Analog Switch and Operational Amplifier (CB21251E)

Found in an Analog Devices documentation from the 1990s, this circuit has a feedback resistor to compensate the gain.

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Motion sensor (CB8762E)
This sensitive motion sensor with inductive sensor was found in a 90s Elektor. The circuit uses only...
Hearing Aid Amplifier (CB6286E)
Suggested by Amperex in a 1968 documentation, this circuit is based on TAA370, an integrated circuit...
Band Pass Filter I (CB19684E)
This filter, found in an old manual, has characteristics of reduced overvoltage given by the graph...