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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Light Changes Detector (CB13884E)
This circuit generates a pulse of approximately 1 second when the light incident on the sensor...
Inverting AC Amplifier 3403 (CB19734E)
The 3403 operational amplifier is not common today, but the configuration can be implemented with...
Metronome (CB12613E)
This circuit, published in 1978, can use any general purpose NPN transistor such as the BC548 and...