Precision_frequency_counter

Published:2009/7/19 22:00:00 Author:Jessie | From:SeekIC

This circuit shows a simple 4-digit frequency counter using an ICM7217 and an ICM7207 (which provides the 1-s gating window and the STORE and RESET signals). The display reads hertz directly, as connected. With pin 11 of the ICM7027 connected to VDD, the gating time is 0. 1 s. This displays tens of hertz at the least significant digit. For shorter gating times, use a 6.5536-MHz crystal (0.01s with pin 11 connected to VD and 0.1 s with pin 11 open)



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