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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Linear Optocoupler (CB15704E)
The Motorola MOC501O optocoupler has a complete amplifier inside the sensor, enabling the...
Integrated Preamplifier (CB18987E)
This circuit is suggested by the Texas Instruments manual of linear applications of the 90's. The...
Alarm with NC sensors (CB25946E)
This circuit was found in the Radio Electronics magazine of May 1990. The supply voltage depends on...