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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5-Channel Remote Control (CB16740E)
In fact, this 1992 circuit consists of a demonstration circuit of a 5-channel remote control that...
Dynamic Transistor Tester (CB19463E)
This circuit is from a French book from 1981. The components used are common and the indicator...
RF Sniffer (CB20248E)
When approached by a circuit that operates with RF signals, this circuit captures them by...