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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Power grid Transmitter (CB25181E)
This circuit was found in the January 1989 issue of Radio Electronics magazine. The circuit sends...
Audio generator 741 (CB8643E)
This simple audio generator with the 741 was found in a 90sTexas Instruments. The circuit...
Digital Pulse Rate Counter (CB16772E)
In fact, this 1994 circuit uses a scale of LEDs to indicate the pulse rate applied to its input....