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digital logic - Downwards 74LS190 with clock wired to another's RCO counts twice - Electrical Engineering Stack Exchange
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Multisim Simulation of a digital circuit that counts from 00 to 99 using two BCD counters (74LS190) - YouTube
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74 Series digital circuit of 74190,74LS190 preset decimal reversible BCD counter(with mode control) - Digital_Circuit - Basic_Circuit - Circuit Diagram - SeekIC.com
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