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Using 2 Data Flip Flops to create an up counter from 0 to 3 and repeats - Electrical Engineering Stack Exchange
How to design a synchronous counter using JK flip-flops for getting the following sequence, 1-3-5-7--9-11-13-15-1 - Quora
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circuit analysis - Counter with 4 flip flops jk synchronous from 3 to 13! - Electrical Engineering Stack Exchange
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