Solved Here is the circuit shown in Fig. 3 using JK | Chegg.com
Creating an 8-bit up/down counter using D flip-flops : r/logisim
CSCI 255 — Flip-Flops and Modules of Truth
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Apparently correct D-flipflop implementation breaking my circuit. When using built-in D-flipflop, the circuit operates correctly - Electrical Engineering Stack Exchange
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Using subcircuits
How can we make frequency divider circuit by using D filp flop? - Quora
Logic circuit using "Logisim" (Sequential circuit) — Steemit