Search found 9 matches

by student999
Wed May 29, 2024 12:33 pm
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

Re: BCD Counter starts at random number

Thanks, I've ironed out the issues and submitted the project.
by student999
Fri May 24, 2024 4:33 pm
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

Re: BCD Counter starts at random number

Ok, i found the gate that triggers the problem, it is the XOR that gets input from the counter stop logic, and outputs into the JK flip flops.
But how can i workaround this problem. I'm beyond confused.
by student999
Fri May 24, 2024 2:22 am
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

Re: BCD Counter starts at random number


Here I simplified it for you. Look at "Counter 0 simple" and "Counter 1 simplified".


Weird, it says its from another version and won't open.

I really don't know whats going on with the Oscillation error, if you can help point me in the right direction, i tried all sorts of wiring but nothing ...
by student999
Thu May 23, 2024 6:17 pm
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

Re: BCD Counter starts at random number

Hello Again,

Here are two counters separated into their respective logic circuits, and the same goes for the others, they work individually, but the problem arises when i attempt to connect them together (the Oscillation error above).

Thanks
by student999
Thu May 23, 2024 5:28 pm
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

Re: BCD Counter starts at random number


First the expression x XOR 1 is equal to NOT x. So, I don't know what you are trying to do here.
Second it is very hard to understand your circuit as it is so big. If you move the repeated parts to separate circuits it will be much easier to test and find issues, not to mention to look at your ...
by student999
Thu May 23, 2024 8:49 am
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

Re: BCD Counter starts at random number

Ok, I found that the problem is with the XORs that are connected with the high pulse (1), but im not sure how to mitigate and circumvent the problem, because these XORs are crucial to the logic that stops the counter (putting the J and K to a hold state of 00) .

Sorry for the many requests, but i ...
by student999
Wed May 22, 2024 4:14 pm
Forum: Circuit Talk
Topic: BCD to 7-SEG decoder with an enable bit
Replies: 0
Views: 23909

BCD to 7-SEG decoder with an enable bit

Hello

Is there a file i can import from that has the decoder with an enable bit, i need it to strobe an Asynchronous BCD counter otherwise it skips random numbers.

Thanks,
Alan
by student999
Wed May 22, 2024 12:57 pm
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

Re: BCD Counter starts at random number


Hi Alan,
JK flip-flops are flipping to a random state at power on. That is why you see it starting at the random state.
You will need to reset them at power on. Please read this discussion: https://logiccircuit.org/forum/viewtopic.php?t=3
and especially the last suggestion from ehennig.
On the ...
by student999
Tue May 21, 2024 11:39 am
Forum: Circuit Talk
Topic: BCD Counter starts at random number
Replies: 11
Views: 71097

BCD Counter starts at random number

BCD counter outputs some undefined behavior. It should count from 0000-9999, but it starts at a random value (eg. 2304), whereas im sure it will work.
Im at my wits end.
Thanks

Alan