Switching circuit (CB9226E)

This circuit was found in a 90's EDN. It can be implemented with either TTL or CMOS logic and used as a shield.

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Micro metronome (CB20743E)
This simple CMOS metronome circuit can be mounted in a small box, providing both sound and light...
Capacitance Switch (CB4993E)
Although indicated in the original publication of the 1980s as a capacitance switch, the circuit...
Chroming with Solar Energy (CB18492E)
In the figure below we have a simple way to do chroming, silvering or another type of...