NASA NTRS · 19650000223
Simple BCD circuit accurately counts to 24
Abstract
Ripple-through counter with divide-by-24 output pulse is used in digital control clocks to register hours and give a daily output signal. It uses commercially available digital modules that incorporate and/gates with flip-flops.
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Spafford, M. L.. 1965-08-01. Simple BCD circuit accurately counts to 24. https://ntrs.nasa.gov/citations/19650000223
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