Digital Electronics: The JK Flip-Flop

This video lecture/tutorial describes the JK Flip-Flop in detail. I begin by describing the general operation of a 7473 JK flip-flop, showing the toggle state that makes this flip-flop important for many applications. Then I show in detail how we can create a JK flip-flop using NAND gates, describing both edge-triggered and pulse-triggered configurations. I implement both types of circuit, using a pulse generator for the edge-triggered version and a master-slave JK flip-flop for the pulse-triggered implementation. Finally, I show how we can add asynchronous set and reset inputs for the master-slave configuration and implement a circuit to demonstrate that this works correctly. This video is part of a module on Digital & Analogue electronics that is taking place at Dublin City University, Ireland. http://www.eeng.dcu.ie/~molloyd/EE223/

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Длительность: 53:48
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Автор AMMOOR AFRICANOO (16 дней)

Автор Creavotronics simple circuits (1 месяц)
thank you very much

Автор Jonathan Lopez (7 месяцев)
this is the best explanation that I have ever got !!! thanks for the video!!


Автор alkolaqi83 (11 месяцев)
The best explanation of flip flop 

Автор shizaep (8 месяцев)
great stuff mate

Автор sHrG78 (11 месяцев)
This is the best and most comprehensive explanation on youtube for FF's.
Thank you!

Автор Mooders It (7 месяцев)

Автор Reka ali (1 год)
thanks for this discussion you are the #1 

Автор Leung Tung Lam (1 год)
Best lecture ever

Автор Naveen kumar (1 год)
It`s nice

Автор Don Gruzas (1 год)
Very very professional presentation, very accurate and very simple to
understand. You must spent a lot of time to create it, thank you Sir, I
will definitely subscribe your channel. Keep doing what you are doing ;)

Автор juvanerik (10 месяцев)
This is an amazing video, the work you do in making these amazing
presentations... just great.

Автор Newton Cazzaro (1 год)
Good thing to know and understand!

Автор bokang chatsane (7 месяцев)

Автор Hannah Kiger (2 года)

Автор Jaynext2 (2 года)
Thanks a lot ... :-)

Автор Michael Rancourt (1 год)
What a great lesson and tutorial, thank you so much for doing this.

Автор Derek Molloy (1 год)
Have a look at my 555 timer video, where I explain how to connect up the
timer - the output of the timer "OUT" can be connected to the clock of the
JK flip-flop.

Автор Derek Molloy (1 год)
:-) Very good... I'm not sure anyone was ever forced to listen to me
before! There should be some type of law against that! Derek.

Автор Wilfred Mulenga (1 год)
God bless you!I've never had a better explanation of J-K flip flops

Автор Paras Bhanot (2 года)
best explanation of flipflops on the internet

Автор bakupcpu (2 года)
This remind me of my electronic classes! But this is way better O.o don't
know why! Nice video!

Автор alienpioneer (2 года)
I just simply love your tutorials.Crystal clear.

Автор Athira N S (2 года)
thank you.

Автор tj mj (1 год)
my teacher is forcing us to watch this now.

Автор Burak Dalfidan (2 года)
Helpful video ! thanks a lot

Автор Jason T. Swartz (1 год)
This was much easier to follow than the text book and less time

Автор André Cavalcante (1 год)
Derek, what app do you use to make your videos?

Автор Azeem Abbas (1 год)
Thank you very much sir. The thing is that we have to construct a pulse
triggering master-slave jk flip flop as part of the course project. You
have used a schmitt trigger which we haven't studied so i do not know about
switch debouncing and noise. I have to use a 555 timer as 'the clock'. And
it has pins RESET, TRIG, OUT, DIS, CTRL and THR. Which pins will be useful.
Can I wholly replace the 555 and schmitt with a debouncing switch if I,
like you mentioned, want single toggle state.

Автор Cubic worId (1 год)
JK is the initials of the guy who invented this circuit in 1958... Jack
Kilby... Just google "JK Flipflop and Jack Kilby" for various sources if
you want.

Автор Mike22533 (2 года)

Автор Derek Molloy (1 год)
The problem is with the clock input to the JK flip-flop. If you have noise
or switch bounce and you have J=K=1 then you may get multiple 'toggle'
states (1 toggle, 2 toggles etc. unknown on a single press). For learning
you can connect a 555 timer (see my video on the 1Hz 555 timer circuit) to
the clock input of the JK flip-flop. This will give you a clean clock cycle
every 1 second. An alternative would be to use a debounced switch (see my
SPST debounce video) to drive the JK clock input.

Автор Cubic worId (1 год)
lol nevermind... i didn't see Mr. Molloy there...

Автор Aprilwindz (1 год)
I was struggling with understanding these concepts till I watched this
whole video through. Truly great at clear explanations and how things work.
Thank you for putting up these videos.

Автор mohamed soliman (2 года)
That's Great explanation many many thanks to u

Автор Derek Molloy (1 год)
It doesn't stand for anything specific... Dr. Eldred Nelson assigned
letters to the flip-flop inputs, a - h but j and k had interesting 'toggle'
properties, so it became the de facto name. Here J means Set and K means

Автор Ays Krim (1 год)
Nice tutorial Sir, but how can we design/put it in a PCB? Our professor
wants us to put it on PCB

Автор StromboliKicks (2 года)
thanks you so much! keep making this beginners videos!

Автор Nakul Agham (1 год)
best n simplest tut ever :) thanks !

Автор Azeem Abbas (1 год)
Greetings! How can I use a 555 timer for pulse generation? Which pins will
be useful? Can you please explain how would a 555 timer be connected when
constructing a jk flip flop?

Автор Pagweb (2 года)
What buttons do you use for your breadboard? Mine tend to pop out of the
breadboard and I'm looking for new ones.

Автор Derek Molloy (1 год)
Hi, it's a combination of applications. Adobe premiere for editing,
Smoothdraw for pen work, audacity for audio and illustrator for diagrams.

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