Micropower amplifier (CB7461E)

This amplifier was found in an Electronics Now from the 90s. The FETs are part of a CD4007CB.

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Water level meter (CB6959E)
This interesting capacitive water level sensor was found in Popular Electronics. The circuit can be...
Parallel Port Isolating Buffer (CB4858E)
In the original 2000, this circuit was designed to interface the parallel port with external...
Fourth-Order Low Pass Filter (CB25816E)
This 10 kHz filter was obtained from an article in Electronics Now magazine in February 1995. The...