Description: 74 series of digital devices designed to use a frequency counter. Requirements: ① with four 7-segment LED display tested frequency, the format is 0000Hz. ② Measuring frequency range: 10 ~ 9999Hz. ③ measurement signal types: sine wave, square wave and triangular wave. ④ measuring signal amplitude: 0.5 ~ 5V. ⑤ design of pulse signal generator, used to produce a gate signal, gate signal width 1S.
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