MULTIDIGIT_DEMONSTRATION_COUNTER

Published:2009/7/13 4:14:00 Author:May | From:SeekIC

Simple interconnection of RS7490 decade counter、RS7447 decoder, and 7-segment digital display for each desired digit makes ideal counter for classroom demonstrations and Sci-ence Fair exhibits, With two additional stages added, display reaches 9999 before recycling. Use 1N914 diode in series with battery to protect against polarity reversal and reduce supply to 5 V for ICs．－F. M. Mims, Integrated Circuit Projects, vol. 6, Radio Shack, Fort Worth, TX, 1977, p53－63.



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