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Electronic Design

Period-to-RPM Converter Measures Very Low Frequencies (.PDF Download)

Measuring the low frequencies that are common in many real-world situations, such as biomedical or speedometer applications, is a challenge due to the long periods of the cycles. A medium-scale-integration (MSI) CMOS circuit (Fig. 1) can measure frequencies in the range of 0.33 to 3.00 Hz (equal to 20 to 180 RPM)...

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