I took up a new job that conflicted with my classes, and am missing lecture the rest of the school year. Wonderful job going through the concepts in a simple way, doesn't even feel like I'm missing class. Thanks a lot dude, you kicked ass here
love your videos. The instructor has a degree in manufacturing not electronics and he is a jerk that makes fun of students when whe have questions. Thank you so much :)
Super great videos! Although I'm having a hard time telling the difference between up counter and down counter, any particular tips for telling when you don't have the timing diagrams?
Katya Noel Stocks No, they use the same clock signal. The up /down count is determined by how the circuit is constructed. For example the up counter can be made by either a positive or negative edge triggered JK flip-flop with the Q output going to the next clock. A Down counter is constructed by either a positive or negative edge triggered JK Flip-flop with the Q NOT output tied to the next clock. In both cases, your usable output is from the Q output. You can have a bunch of counters synchronized to the same clock, but running both up and down. Hope that helps.
Nice video, thanks. But what kind of a counter is a 7490? It's a decade counter but why when it has 4 flip-flops, then shouldn't it be able to divide by 16?
7490 is a decade counter when the first output is connected to the second clock input (Pin 12 to 1). Truly, it is a divide by 2 counter and a divide by 5 counter. It is not a Mod 16 because it is set to automatically reset internally.
Logisim defaults to a positive, or rising, edge clock input. That would change the up/down mode of the counter. Change them all to falling edge and it should fix it.
How can I design a bcd counter with mod66? I watched all of your videos but i just couldn't figure out how to do that. If you could answer as soon as possible that would be much appreciated.
I am not sure what you mean by a mod 66 BCD counter. BCD counters are mod10 counters built into sets of the number of digits you want to represent. Now for a mod66 counter.. You will need 7 J-K flip flops tied either asyc or sync. A 2-input NAND gate will tie to the 2nd and 7th (last) JK outputs. The NAND output will then tie to the JK resets. Link to picture: district.bluegrass.kctcs.edu/kevin.dunn/files/mod66_counter.jpg
if I have ten buttons with ten digital number displays above them, how can I wire it so that when I push a random button the display above it reads "1", then the next button I push reads "2" and so on, with each number display keeping its number until reset? I cannot find anything showing how to do this. Is it possible? Would the buttons need to be held down? or can it be done with the buttons being pressed and released as long as they are each only pressed once?
If there were only one display, it would be pretty easy to do. Having multiple displays poses a problem. One solution would be to have each display attached to it own counter. When any button is pressed it causes the counters to increase. The oddity is that you will need to blank the displays until that button is pressed. Maybe with an SR flip-flop to hold the line until the button is pressed. That same SR FF would also need to disable the counter so it would not count up anymore. I hope that helps a bit. At least point you in the right direction.
Is there any possibilities that Q0 will be toggled from positive edges of the clock? seems like all types are start with toggling on negative edges only that the Q1 Q2 Q3 depend.
+Ang John Syin Yes, you just need to draw out the diagrams with positive edges. What happens is the ones I have as up counters, will not be down counters and my down counters will be up counters. They work the same.
+aadarsha subedi A ripple counter is the first ones I cover. They have the Q output tied to the next JK flip-flops clock input. A BCD counter just means the counter only counts from 0-9 (or 9-0).
i have been surfing for a long time to get this type of explanation on counters.....Thank you
Thanks. Glad to help.
Soo grateful for this, now am ready for my test tomorrow. Thank you
Glad I could help.
Excellent job providing every possible examples out there!
I really do appriciate the kind words.
Extremely helpful! I was studying for my midterm and I was so lost.
+Lucy McKinley So glad I could be of help. Thanks for watching!!
thank you for these videos, my book is impossible to read and these vids help so much
+Ahirtz Thank you for watching and the comment!
had trouble studying from my notes. You made it easy and fun Thank you so much :)
+Shauryea Salvatore Glad I could help!!
sir how come you are this good? :D i can't get enough of your videos
mbisetakobana Thank you very much!!
could realize a lot of experience from your teaching, especially last one(automatic and manual reset story).. Thumps up sir.
Thanks!
Sir, I couldn't thank you enough.
Excellent explanation and good examples.
I appriciate it.
huge thanks my man I have an exam coming up in a couple of days and this really cleared it up for me.
+martinoland1 Glad to help. Good luck on the exam.
you are the best and a life saviour. thanks for the amazing videos
Thank you!
I took up a new job that conflicted with my classes, and am missing lecture the rest of the school year. Wonderful job going through the concepts in a simple way, doesn't even feel like I'm missing class. Thanks a lot dude, you kicked ass here
Thanks. Glad I could help.
This was massively helpful!
Thanks!
The videos are so helpful! Wish I had seen them before :P Thanks!! :)
+Khyati Mehta Thank you.
Thanks for the beautiful video :) ; it was so helpful for me :)
+Bishnu Tiwari Thank you!
Thanks for the videos....really helpful
+john conner Thank you very much.
this was awesome dude...
helped me a lot
Thanks!
very helpfull Thanks a lot !
Thanks!
Great explanation! Now I will definetly do great on my test tomorrow! If I can ask, are all the counters in the begining called ripple counters?
Yes, all the ones at the start are ripple counters. You can tell they are ripple because the output of one feeds the clock of the next.
love your videos. The instructor has a degree in manufacturing not electronics and he is a jerk that makes fun of students when whe have questions. Thank you so much :)
+Angelica Morales Very sorry to hear that. I am glad I could be of help!
you are the best
+Mohamed Elmasry Thank you.
your really helpful...thanks a lot..
Thank you for the comment.
thanks a lot. Your videos are so helpful...
+aadarsha subedi Thank you.
+MovieHQ welcome
Great video. Thank ypu
Thanks for watching.
very good lectures.
Thanks!
I love you bro
Glad to help
Super great videos! Although I'm having a hard time telling the difference between up counter and down counter, any particular tips for telling when you don't have the timing diagrams?
Do down counters run off of the same clock pulse and up counters run off of opposite?
Katya Noel Stocks No, they use the same clock signal. The up /down count is determined by how the circuit is constructed. For example the up counter can be made by either a positive or negative edge triggered JK flip-flop with the Q output going to the next clock. A Down counter is constructed by either a positive or negative edge triggered JK Flip-flop with the Q NOT output tied to the next clock. In both cases, your usable output is from the Q output. You can have a bunch of counters synchronized to the same clock, but running both up and down. Hope that helps.
you are the best!!!
Thanks!!
thank you sooo much
a00000z100 You are very welcome!
:) Jakak Allah Khyran
At time 25:15 u mentioned reading a book.. which book are u referring to? Or can this be on any digital electronic book?
thANKS
Nice video, thanks. But what kind of a counter is a 7490? It's a decade counter but why when it has 4 flip-flops, then shouldn't it be able to divide by 16?
7490 is a decade counter when the first output is connected to the second clock input (Pin 12 to 1). Truly, it is a divide by 2 counter and a divide by 5 counter. It is not a Mod 16 because it is set to automatically reset internally.
thank a lot :)
You are welcome!
Hello! I am confused. When I make this logic in logisim (at 8:30) I get down counter. Not up counter. Why so?
Logisim defaults to a positive, or rising, edge clock input. That would change the up/down mode of the counter. Change them all to falling edge and it should fix it.
MovieHQ thanks!
How can I design a bcd counter with mod66? I watched all of your videos but i just couldn't figure out how to do that. If you could answer as soon as possible that would be much appreciated.
I am not sure what you mean by a mod 66 BCD counter. BCD counters are mod10 counters built into sets of the number of digits you want to represent. Now for a mod66 counter.. You will need 7 J-K flip flops tied either asyc or sync. A 2-input NAND gate will tie to the 2nd and 7th (last) JK outputs. The NAND output will then tie to the JK resets. Link to picture: district.bluegrass.kctcs.edu/kevin.dunn/files/mod66_counter.jpg
if I have ten buttons with ten digital number displays above them, how can I wire it so that when I push a random button the display above it reads "1", then the next button I push reads "2" and so on, with each number display keeping its number until reset? I cannot find anything showing how to do this. Is it possible? Would the buttons need to be held down? or can it be done with the buttons being pressed and released as long as they are each only pressed once?
If there were only one display, it would be pretty easy to do. Having multiple displays poses a problem. One solution would be to have each display attached to it own counter. When any button is pressed it causes the counters to increase. The oddity is that you will need to blank the displays until that button is pressed. Maybe with an SR flip-flop to hold the line until the button is pressed. That same SR FF would also need to disable the counter so it would not count up anymore. I hope that helps a bit. At least point you in the right direction.
Is there any possibilities that Q0 will be toggled from positive edges of the clock? seems like all types are start with toggling on negative edges only that the Q1 Q2 Q3 depend.
+Ang John Syin You can use positive edge trigger FF. They just all need to be positive edge triggered. NOt sure if that answered your question or not.
+MovieHQ could you show me some pictures of that? really appreciate your replies
+MovieHQ in all cases of the video, all Q0 is based on clock's negative edges. my question is, is there possible to toggle on positive edges?
+Ang John Syin Yes, you just need to draw out the diagrams with positive edges. What happens is the ones I have as up counters, will not be down counters and my down counters will be up counters. They work the same.
+MovieHQ but how would the flip flop be?
hello ... i didnt understand how u can know " on which count does the synchronous counter reset ? "
At about 26 minutes into the video I explain how to determine when it resets. It depends on where the inputs to the NAND gate are connected.
simply explined
+suthan sivan Thanks!
Is it ok for me to say I love You!? cuz right now thas how I feel.
HAHA. Thanks.
please reply the name of counters in this video
+aadarsha subedi They are in the video description.
+MovieHQ thank you.
Whats a negative edge
The negative edge is the section of the clock going from positive to negative.
I need in help of binary and bcd ripple counter..
+aadarsha subedi A ripple counter is the first ones I cover. They have the Q output tied to the next JK flip-flops clock input. A BCD counter just means the counter only counts from 0-9 (or 9-0).
+MovieHQ thank you so much.. :)
+MovieHQ n binary having 0000 to 1111..
wertyui