Alpha and Theta waves modulator (CB26155E)

This circuit, which presents a certain danger and should be used with caution, was found in the Electronics Experimenter Handbook magazine.

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Signal Drop Detector (CB6117E)
This circuit was found in an 80's General Electric documentation. The circuit uses uncommon...
Balance indicator for stereo (CB9107E)
This circuit was found in Electronics Today International of the 80's. The circuit uses still...
450mW amplifier (CB18570E)
Using transistors common at the time (1960s) this amplifier with transformers in the output stage...