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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Schmitt Trigger Oscillator NCX2220 (CB20386E)
The NCX2220 circuit from NXP consists of a voltage comparator with low supply voltage and can...
10 Hz to 10 kHz VCO (CB8746E)
This 3-decade operating range VCO was found in a 90s Popular Electronics. The circuit uses...
Car Air Conditioner (CB15130E)
This circuit controls a fan in the car, according to the temperature, activating it automatically when the...