Analog switch (CB21253E)

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

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Sinusoidal generator (CB21632E)
Found in Popular Electronics from March 1957, this circuit is based on transistors from the time....
500 mA PC interface (CB11408E)
With this shield circuit it is possible to control several loads up to 500 mA from the parallel port...
Automatic Lighting Control (CB17427E)
This circuit automatically controls the degree of illumination. As the circuit is from 2001, it...