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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Schmitt Trigger (CB21849E)
We found this circuit in the 1974 Ferranti transistor manual. Transistors are from the time, being...
Linearity corrector for thermistor (CB21387E)
This temperature sensor circuit was found in an old American documentation. The components used...
Bass and Treble Filter (CB19812E)
This separator filter is from an old publication. The capacitor can have 10 to 47 uF of the...