手工翻译:This essay mainly introduces the means and steps of designing the digital cymometer, which consists of five parts--amplifier circuit, shaping circuit, counter, switch control circuit and display circuit. By magnifying, rectifying,collecting and counting the signal, the measurement of frequency can be realized. The components of circuit have the the feature of simplicity, low cost and easy to assemble. Therefore, this digital frequency is a suitable programme for primary designer to practice.
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