Harmonic Distortion Meter (CB26187E)

This complex circuit was found in the 1993 edition of the Electronics Experimenter's Handbook. Most of the components are still common today.

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Alpha and Theta waves modulator (CB26155E)
This circuit, which presents a certain danger and should be used with caution, was found in the...
Varicap Spy Transmitter (CB19433E)
This circuit with variable capacitance diode (varicap) is from a publication from the 90s. The...
Variable Gain Instrumentation Amplifier (CB15876E)
This circuit, shown in the figure, consists of a variable gain amplifier with differential input...