Battery Charger (CB26303E)

This automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a relay for automatic shutdown.

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Timed Sequential Controller (CB4453E)
This circuit found in a 1988 documentation consists of a timer or sequential timer controller. The...
Electronic Scoreboard (CB16534E)
We found this digital scoreboard in a 1998 publication. It has two 7-segment displays, but it can...
Sound Effects Center (CB11503E)
This circuit generates several types of sounds that are programmed in the available...