Radar detector (CB8628E)

Found in a 90s Electronics Engineering, this circuit makes use of components of the time. The critical component is the microwave sensor diode.

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High Speed Buffer (CB4991E)
This circuit from an 80's publication also features low input capacitance. FET can be a modern...
Two-Transistor Old Flip Flop (CB949E)
This circuit was found in a 1958’s publication. It uses germanium transistor, availble that time....
Complete Cell Protection System (CB5414E)
This complete single cell protection system is suggested by Linear Technology in its 2005 manual....