Digital Fuel Gauge (CB26173E)

This two-digit circuit was found in the 1999 Radio Experimenter Handbook. It uses the CA3161 and CA3162 A/D converter pair common at the time.

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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...