Liquid Flow Meter (CB6340E)

This circuit was found in an old Linear Technology documentation. The working principle can be harnessed in modern designs with current components.

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6-Bit D-A Converter (CB12219E)
We found this 6-bit digital to analog converter in a 1992 Electronics Handbook. The circuit does...
Very Simple Theremin (CB6704E)
This circuit operates with an AM radio tuned to or near 900 kHz if there is a station at this...
2.5V Negative Voltage Reference LT6654BX (CB4741E)
This circuit was found in the Analog Devices component manual, providing a negative voltage of 2.5 V...