Here is my whole diagram. There is no output while also clock is ticking...
I think there is a problem with the counter, but I can't figure it out.
I use rising-edge flipflops.
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\$\begingroup\$ I hope you will add your schematic soon. \$\endgroup\$– Math Keeps Me BusyJul 27, 2022 at 19:29
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2\$\begingroup\$ Since this looks like homework we will expect you to show us that you have made a substantial effort to solve this yourself. Show us all of your work: truth tables, state tables, etc. Describe exactly what "doesn't work" means. Then you can ask a specific question. \$\endgroup\$– Elliot AldersonJul 27, 2022 at 20:06
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\$\begingroup\$ You proably need a power-on reset to set the flip-flops to a known initial state. \$\endgroup\$– Peter BennettJul 27, 2022 at 20:12
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1\$\begingroup\$ I added clock in place but no outputs. - Do you see the clock changing? \$\endgroup\$– Eugene Sh.Jul 27, 2022 at 20:15
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\$\begingroup\$ Also your NAND output connection doesn't look good. Delete the line and reconnect. \$\endgroup\$– Eugene Sh.Jul 27, 2022 at 20:17
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1 Answer
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If those are positive edge triggered flip-flops then you need to come off the Q-bar outputs into the next clock inputs for an up counter. Come off the Q outputs as shown in your diagram if the flip-flops are negative edge triggered. If the flip-flops shown are positive edge triggered then the counter will count down from 0 direct to 15 and immediately reset back to 0.