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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Commercial Radio 6TR 127 (CB18355E)
This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW...
Car Alarm (CB6773E)
Found in a Popular Electronics from the 90s, this circuit uses components that are still current....
Simple Capacitor Meter (CB19588E)
This circuit consists of a simple capacitance bridge. The handset can be high impedance from 500...