Analog switch (CB21253E)

This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern equivalents.

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Dual Frequency Generator (CB16305E)
What is a dual frequency generator for? There are several possibilities of use for this circuit. The...
4-input stepper motor control (CB23786E)
The circuit, illustrated in the figure, consists of the direct application of the ULN2003 in which...
Ultrasonic ear (CB21314E)
This circuit was found in a Popular Electronics from the 90's. The output signal can be applied to a...