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Making a 9-0 synchronous down counter using flipflopsflip-flops

1I've I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflopJK flip-flop:

[enter image description here]enter image description here

kmapsKmaps using logic fridayLogic Friday: enter image description here

Simulation in proteusProteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.:

enter image description here

I got it working thank you all. aA lot of misinputs was present in making the state table.

nestNext is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflopflip-flop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0,7 7,6. 6, ... I want it to start at 6. How can I do this??

Making a 9-0 synchronous down using flipflops

1I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflop

[enter image description here]

kmaps using logic friday: enter image description here

Simulation in proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.

enter image description here

I got it working thank you all. a lot of misinputs was present in making the state table.

nest is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0,7,6.... I want it to start at 6 How can I do this??

Making a 9-0 synchronous down counter using flip-flops

I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the JK flip-flop:

enter image description here

Kmaps using Logic Friday: enter image description here

Simulation in Proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth:

enter image description here

I got it working thank you all. A lot of misinputs was present in making the state table.

Next is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flip-flop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0, 7, 6, ... I want it to start at 6. How can I do this?

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Noobielectrix
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1I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflop

[enter image description here]

kmaps using logic friday: enter image description here

Simulation in proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.

enter image description here

I got it working thank you all. a lot of misinputs was present in making the state table, glad I found it.

Final Results:

enter image description here enter image description here

nest is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0,7,6.... I want it to start at 6 How can I do this??

Below are the table and schematic I made:

[enter image description here] 8 enter image description here

1I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflop

[enter image description here]

kmaps using logic friday: enter image description here

Simulation in proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.

enter image description here

I got it working thank you all. a lot of misinputs was present in making the state table, glad I found it.

Final Results:

enter image description here enter image description here

nest is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0,7,6.... I want it to start at 6 How can I do this??

Below are the table and schematic I made:

[enter image description here] 8 enter image description here

1I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflop

[enter image description here]

kmaps using logic friday: enter image description here

Simulation in proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.

enter image description here

I got it working thank you all. a lot of misinputs was present in making the state table.

nest is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0,7,6.... I want it to start at 6 How can I do this??

6 to 0 count down for the 2nd digit
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Noobielectrix
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1I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflop

[enter image description here]

kmaps using logic friday: enter image description here

Simulation in proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.

enter image description here

I got it working thank you all. a lot of misinputs was present in making the state table, glad I found it.

Final Results:

enter image description here enter image description here

nest is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0,7,6.... I want it to start at 6 How can I do this??

Below are the table and schematic I made:

[enter image description here] 8 enter image description here

1I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflop

[enter image description here]

kmaps using logic friday: enter image description here

Simulation in proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.

enter image description here

I got it working thank you all. a lot of misinputs was present in making the state table, glad I found it.

Final Results:

enter image description here enter image description here

1I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a simulator, it just doesn't give me the output I want.

I've tried making the don't cares (10-15) as 0 but still doesn't work.

Here's the state diagram:

enter image description here

Here's the state table:

enter image description here

I followed the kmap results in the simulator but still can't get it to work.

Here's my state table for the jk flipflop

[enter image description here]

kmaps using logic friday: enter image description here

Simulation in proteus, it counts down from 0 to 9 but gets stuck at 3 and 2 going back and forth.

enter image description here

I got it working thank you all. a lot of misinputs was present in making the state table, glad I found it.

Final Results:

enter image description here enter image description here

nest is to make the 2nd digit in this count down I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar process I used in the first digit.

But when simulating it, it starts at 0,7,6.... I want it to start at 6 How can I do this??

Below are the table and schematic I made:

[enter image description here] 8 enter image description here

Got it working
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Jk flipflop state table
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