Battery charger (CB9121E)

Found in an Electronics Now from the 1980s, this circuit uses some components that are still common today. For others, equivalents can be tested.

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Car Amplifier Module (CB17114E)
This circuit is intended to reinforce old car radios, having been found in 1997. At that time,...
Sampling and Holding (CB14149E)
The Sample and Hold circuit shown in the figure was found in a 1994 Linear Applications Handbook by...
Undervoltage Detector (CB6524E)
Found in a 1980s documentation, this circuit detects when the voltage drops below 11 V. Other...