Metal detector (CB7959E)

Found in a 90’s 303 Circuits, this circuit uses components that are still common and has a common LED as indicator.

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Active Filter (CB5109E)
This active crossover filter was obtained from the component manual used. Below is the performance...
Complementary Power Switch (CB5299E)
This circuit is from an 80's documentation. It makes use of two SCRs with current capacity...
Automatic Plant Watering Can (CB16246E)
This interesting idea was found in a 1983 publication and is very simple to analyze, according to the...