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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Precision Current Voltage Converter with the CA3140 (CB12299E)
The presented circuit can be implemented with a BC548 and for larger currents a BD135 can be used....
Proximity Switch (CB6410E)
This circuit works directly connected to the network and special care must be taken with its...
Timer 555 (CB8715E)
Suitable for dual applications, this timer was found in a 90s Popular Electronics. The circuit...