DIGITAL_COUNTING_DEMONSTRATOR

Published:2009/7/13 4:41:00 Author:May | From:SeekIC

555 timer serves as dock for driving RS7490 decade counter feeding RS7447 BCD to 7-segment decoder that drives 7-segment digital display. R1 is adjusted to give clock frequency that makes display cycle slowly through digits 0-9 and repeat, for classroom demonstrations. －F. M. Mims, Integrated Circuit Projects, vol 6, Radio Shack, Fort Worth, TX, 1977, p 53－63



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