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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Humidity Sensor (CB4912E)
This circuit was obtained from a Linear Technology manual from the 1990s. The components may have...
Function Generator (CB4006E)
The circuit shown uses the LM324, but can be implemented with other operational ones. The source...
Teleprinter power supply (CB8847E)
Originally created to power an 80's RTTY printer, this circuit can be used in other applications. The...