Period-to-RPM Converter Measures Very Low Frequencies

Ricardo Jiménez, Fernando D. Pacheco, and Blanca L. Rodríguez

Measuring long-period signals and translating them to low-frequency RPM is challenging, but a circuit built of medium-scale ICs will do so—without a microcontroller or firmware.

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from Electronic Design http://bit.ly/2cYyFvH