FOUR_MODE_FREQUENCY_COUNTER

Published:2009/7/12 23:01:00 Author:May | From:SeekIC

This counter can measure frequencies from 2 Hz to 1 MHz, time interval, and period, and count random events. A 74C926 and 74C925 are used as the counter, and these will drive a multiplexed LED display. A 2-MHz time base is used, and a divider chain is used to derive a 1-s gate. An LM339 op amp serves as the input buffer, and CD4000 series logic is used for gating and switching functions.



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