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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Water activated alarm (CB22076E)
This circuit was found in an English documentation from the 90's. Equivalent components such as...
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This circuit was found in an Electronics Now of the 80s applying to NiCad batteries of the time....
Stepper motor control (CB12763E)
The pulses applied to input C of the SAA1027 integrated circuit determine the engine speed. Each...