Dolby noise reducer (CB21105E)

This circuit was found in a National Semiconductor Handbook from the 1990s. The integrated circuit used is from the time and the circuit is stereo.

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Stepper Motor Control (CB13805E)
This configuration was found in a 1976 publication. The outputs of the logic circuits are applied to...
Frequency to voltage converter 555 (CB25990E)
With this circuit it is possible to measure frequencies up to about 500 kHz using a common...
Touch Action Switch (II) (CB146)
The very high-input impedance of the CMOS gate allows this kind of device to be used as a...