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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Negative Voltage Source 78xx (CB15161E)
We found this circuit in the 1982 SGS Linear Integrated Circuits manual. The L78xx is equivalent to 78xx...
Ceramic filter Amplifier (CB23844E)
We found this circuit in Radio Electronics magazine from October 1962. The article announced the...
Traffic Light (CB21013E)
This sequential relay actuation system circuit for traffic lights was found in Electronics Now...