For anyone wondering about the drawing: The mistake lies in the connections of the Q outputs to the AND gates. Q must connect to the upper AND gate with the J input, while !Q must connect to the lower one with the K input. Now it works as it should: J performs the Reset function, K performs the Set function, and J+K at the same time performs either the Set or the Reset function, depending on which state the Q outputs have been before, a.k.a. it performs the "Toggle" function.

The JK flip flop was named after Jack Kilby, the Texas Instruments engineer who invented the integrated circuit in 1958

FINALLY!!!! A well spoken English video with a great explanation. Dont stop

This guy probably makes some wicked devices in Minecraft with redstone.

I love these videos. They take me back to the sixties at the start of my career. As already stated and I agree - The inputs are labeled J and K in honor of the inventor of the device, Jack Kilby

This guy is the only reason I am passing my Digital Logic class

I greatly appreciate you efforts in term,s of time and resources to create these wonderful videos. I will be taking a Logic class in the fall , and I wanted to experiment with the fundamentals of digital circuit design. I am using CMOS, but I believe I need to get some TTL chips. These tutorials are top notch on several levels.

Yayy Ben!! All the nerds of KZfaq smile today with glee! Thanks for the video!! can't say how excited I am to see more of your awesome content!

Your Latch series is the best explanation I´ve heard so far. Glad to find you out.

Sir you're the best teacher humanity could ever have, illustrating this subject, on which ever level, be it high school, university or even post grade. These series of tutorials should be carved into a stone be passed on to learners for millennia

Ben Eater , you are my teacher, and I am a very serious student of yours! I don't have a single competent engineering teacher in my school, even though I go to one of the top highschools in America (I'm not saying which because I don't want this comment on my teachers to be tracked to me personally). I used to take an engineering course, but realized this piece of information for myself and from older students, and dropped the course later. I then discovered you, and now I learn by myself. So that's why I say you are my teacher, because I'm not using you to supplement another teacher or anything; everything I know about circuits is the very basics from Khan academy, and all the very advanced logic and circuits you do. I watched every single video you created and took notes, and create my own circuits, following along to your videos; I'm not joking when I say that I'm a student of yours. I plan to make a big project for school in the school expo making a breadboard computer like yours (with some of my own modification and additions). Without you, I would be nowhere, and know nothing about circuits, and you allowed me to make a big step in my dream of understanding how desktop computers work on a deep level. Your explanations are amazing, and you are a very talented teacher and explainer, very easily sympathizing with the a student's situation of not knowing anything, unlike many others. Your explanations are thorough, and very ordered in the final goal of understanding, taking nothing for granted through your deep understanding, which is probably one of the top things I love about your teaching; you understand and explain things on such a deep level. Not to mention, your a native speaker and aren't annoying or hard to listen to like many other youtubers with Indian accents. I think I speak on behalf of quite a few people in begging you to please continue making videos, and that we appreciate your videos so much, and at least know that you have truly inspired and dramatically changed the understanding of circuits for many people like me, and I'm not trying to be sentimental or anything, I seriously mean it. I really want to be an engineer in this direction. Ben Eater, from the bottom of my heart, thank you for these videos!

Your service is greatly appreciated. A university-level engineering course, tuition free. Thanks for sharing.

I was fascinated by this circuit back in the day! I thought of this circuit as a means to 'transcend' logic (in logic circuits.) I used it as a random number generator and did many projects needing 'random' logic.

good to see you back, man, I love your videos, keep up the good work

Wonderful to see you posting again, great video Ben!

I believe there is an error in the layout of this circuit. It seems that when using nor gates you don't want to go from the opposite side nor gate back to the and gates. If you were using nand gates rather than nor gates your diagram would be correct. Since you are in fact using nor gates, you would go back from the same side nor gate to the and gates. Can someone else please confirm this?

Yay you're back! Thank you for the awesome video :)

So happy to see you back Ben!

THIS IS EXACTLY WHAT I NEEDED AND WHAT MY LECTURER TODAY WAS UNABLE TO EXPLAIN - Thank god for this little series you have done it has helped me so much

I have discovered that watching to many of these videos in a row makes my head numb and I can no longer figure out what is happening in the circuit. So it, that I have decided that I can only watch onnne ia eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ah, this is what happens when you fall asleep for a few seconds while typing. Thanks Fentynal!

welcome back :) good to see you again.. can't wait to build the control unit with you!

Who downvoted this video? Great videos. The joy of building this stuff has added quality and satisfaction to my life. Thank you Ben!

Glad you're back! I love these videos! I bought a bunch of discreet electronics parts to build this computer.

Sweet you are back, make more please.

Awesome! Thank you Ben! Hope you're having an awesome holiday season!

seriously, your video saved my whole semester.. thanks a lot

That reminds me of the "Electronic Coin-Toss" we made as our first electronics project in 8th grade.... I think it was just both R and S effectively being high, and a push button for the Enable -- then it'd light up either Heads or Tails as the Q and Q-bar. I don't _actually_ remember the circuit, but it looked very similar.

You explain this better than any instructor in my current institution that costs 70k a year. Thank you.

thank you for a new video, i've been waiting for quite some time. Building 8bit computer. Because of your enthusiasm and great teaching.

You're back! Nice :D. Great stuff as always

I believe this one is faulty. You have to either switch places on both Q & Q' and J&K for this to work OR You have to keep them like that but have the and gates switch their outputs (or gates). And gate on top goes to the or gate on the bottom etc.

Been waiting a long time for this one. :) Good to see you back!

Ben, without having even watched the new video - soo good to have back man!

Thanks for the tutorial, Ben! Helped a lot.

excellent tutorial! a great refresher from my college days thanks for sharing!

Hey Ben! The JK in JK Flip-Flop is actually NOT an arbitrary set of letters, it's after the creator Jack Kilby! :) Thanks so much for the vid!

A famous experiment for JK FF is to set both the J and K high and then connect the CLK to an active high MOM switch, this will toggle the output between HI and LO... The mechanical switch may produce noisy output so the filtering RC circuit is a must.

Best explanation I have ever watched! Very good work!

I don't usually comment on videos, but your videos are awesome.Thanks !!!

Ben please more tutorials on networking security and analysis, im even willing to pay for, you are a genius.

The “Just Kidding” flip flop

Ben is ALIVE AGAIN!!

Ben, you're amazing

Just subscribed a few weeks ago. These are so great!!

Ben, great video! Eagerly awaiting the continuation of your breadboard computer series. Also, there's an urban legend floating around that the JK Flipflop was named after Jack Kilby! However, this isn't confirmed. The first time those letters started being used was in one of the early patents for the design, where the patent author chose those letters for some unimportant reason.

Thanks, i'm going to study these in school soon so i wanted to know them before they teach us them Thanks for the simple explanation! 😄😄😄

Thank you very much for the video Ben, it's excellent! Really helped me! The J-K is in honour of Jack Kilby ;)

Thank you very much I've seen lots and lots of videos explaining this, I guess your diagrams really help

thanks for explaining so clearly

love your videos

very very thanks sir you made my sequential circuit easy

Ben, I beleive there is an error! When explaining the final schematic, you say that K resets it when it outputs a one, but it seems as if the K output is going into the set input of the S and R latch, you can see that when you go back to the diagram of the S and R latch and see that the bottom input is the Set input. I feel like the K input should go to the top nor gate and that the J should go to the bottom nor gate

Thank you for great work, you are a very smart man.

awesome explanation

I learned about logic gates, flip-flops, latches, when I was in 1st-year university, 12 years ago, but the professor did not provide the electronic behind it and how it actually works in the circuit board. I was ultimately confused when I was taught the inner schematic of flip-flop consisting of logic gates and a feedback line. I thought it didn't make any sense at all. I was studying computer science, by the way. So logic gates, flip-flop, and stuffs were only a part of introductory courses in my major, without actual physical implementation. We only used a computer-based simulator software (Multisim) to create a schematic of a logic circuit. On the other hand, I studied some basic electronics during my high school and was introduced with electronic components including resistor, transistor, capacitor, and so on. But it was really difficult for me to connect between electronics, digital logic circuits, and eventually a computer, and I realized for a very long time that there is a missing link that wasn't really taught by my professor at the university. But you explained it in a very clear and concise manner, with an actual demonstration, and finally, I understand how the feedback line in a flip-flop works, and its relationship with how a transistor works in an electronic circuit, and even I can finally connect all the dots from the electronic circuit primitives into a real computer. Thank you very much for all your videos. You said you didn't have a degree but you explained this topic way better than my professor did. You proved that there is something that is really wrong with the education system as you mentioned that your ultimate goal is to improve it. I hope you will achieve your goal, and perhaps you will actually introduce students properly about how basic digital system works. :)

sweet, thx for your videos!

Perfect ! thank you for teaching this .. it was confusing me

Thank you for this!

It would be awesome if you made more videos like these where you explain different ICS

Oh boy... I can't wait for rest of the computer tutorials!

Since I've started watching your videos I have bought more than 16 breadboards, hundreds of 74LS parts and an oscilloscope...

finally! please post more tutorials

You need to make the SR latch with NAND gates to work as you describe. Great videos explaining while doing the experiment at the same time

We need to share these videos and really get them out there to motivate Ben. They're fantastically well made and I think we can all agree that they are invaluable rescources for anyone interested in electronics and logic. Keep them coming!

Great set of videos (content). Good shooting. Understandable English.

Thank you for following up! Some of us were paranoid about the break in vids, given the value of what you do. This stuff is turning me into a programmer. I know a wealth of languages, without knowing what I'm actually doing, which makes me so much worse. "What is a variable really?", "How does a function do?". This is absolutely invaluable. Thank you so much for what you're doing. :)

Nice info,thanks :)

best explanation :)

good lesson

Don't forget to hit the bell icon to get notifications! Ben's super great, and part of that is not shilling for views, likes, and subs. So let's shill on his behalf!

Aren't the feedbacks from the output of the J-K Flip-Flop connected the other way around?

Finally I understand what a flip flop does

Yay! He's back!

I think j stands for "jump" and k for "kill". Nice video though :D

You have wrong at this time🤭 but you are the guy who responsible i completely understand the deference between SR, D, Flip flop, and JK flip flop. 👍. Well done ♥️

A Christmas miracle

A JK flip flop sounds like all the flip flop you'll ever need.

A guy I worked with used to teach electronics and when he got to the jk flip flop he called it by a very fitting name, the John Kerry flip flop.

Thanks!

Any idea why this video only uploaded at 480 resolution?

welcome back dude

There is a mistake in the JK schematic diagram - the K works as reset and must be on top and J (set) in bottom. Just compare it with SR flip-flop diagram wich is the same except for the feedback lines from the Q/Q-not outputs.

It's great to see a new video from you! Isn't there an issue with this flip flop? Surely if J and K are both high then you get the toggle, that's fine. But wouldn't that toggling just keep looping back and forth until your clock 'enable' goes low, eventually settling into some unknown state? Are you just relying on that spike being short enough that you don't get this sort of feedback?

ure back have happy holidays

Some say the JK-Flip-Flops where invented by Jack Kilby, but I think it's more like an homage to Jack Kilby that those inputs are called J and K, since Kilby was the inventor of integrated circuits (germanium based, which was invented in his freetime in September 1958) and also the inventor of the electronic calculator. The JK FlipFlop got patented in 1966 (May 18th) by Motorola Inc. (Norman J. Miller) and I think Kilby was only working for Texas Instruments and also as a private inventor/engineer. Also often used terms are Jump and Kill. Miller did not mention the meaning of J and K, I just looked the patent sheet, he just wrote J and K there.

Much love

Great video Ben! The fact that the state is unknown when S and R = 1 is very interesting. Maybe it could be used for producing a chance operation. Like a random flip of the coin

He's back :D

very nice thank you

I prefer wearing shoes... JK! Flip-flops! xD

BEN IS ALIVE!!!! YAY!!!

oh man you need to finish these videos!!! LOL

Lost me on the last bit, glad to see it got fixed.

YEAH, YOUR BACK

Error Correction Notice: This video has an error regarding the JK Flip Flop which Ben has stated and fixed in his next video kzfaq.info/get/bejne/qdpjoLh22sidaXk.html The names J and K should be reversed in this video. Also I believe as other comments have suggested, the feedback loops shouldn't be crossed. Meaning that feedback from Q should go back to the top AND gate and the feedback from Inverse Q should go back to the bottom AND gate.

Him: yo how ya storing ur memory Me: DDRAM dims Me: JK flip-flop

The inputs are called J-K after Jack Kilby, who invented the integrated circuit in 1958. 😁

JK means Jack Kilby ! Btw really good video !

two ICs are talking. -Hi, I'm an opamp. What are you? -I'm an D flip-flop. -Wow, seriously? -Nah, JK.

So... in summary (having been through the set now) SR latch has two inputs, one to turn it on, one to turn it off. A D latch has one input to turn on or off but its state is ignored until the enable is on. A D flip flop is similar but the enable (clock) rising edge is converted to an "enable" pulse to make it only check the input state momentarily. A SR flop flop is similar to a SR latch, but the state of the inputs is ignored unless an "enable" is on (which is actually a pulse created from the rising edge of the clock). A JK flip flop is the same but with some extra connections to ensure the "both inputs on" state doesn't cause unknown behaviour and instead toggles the output in a predictable way. [Note, mainly just wrote this to summarise to myself]