Binary counter

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Genre: Education

Family friendly? Yes

Wilson score: 0.9905

Rating: 4.9792 / 5

Engagement: 2.33%

Ben Eater

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Shared January 22, 2017

The JK flip-flop can be used to count in binary!

Support me on Patreon:

You can get all the components used in this video from any online electronic components distributor (Jameco, Digikey, Mouser, etc).

Complete parts list (everything in this video):
- 4x 74LS76 (Dual master-slave JK flip-flops)
- 4x LEDs
- 22 gauge wire
- 5 volt power source (e.g., a USB phone charger)
- Clock circuit from

Braken the Mole

That end reveal was amazing

7 months ago | [YT] | 33

Chris Orellana

I wish I could like your videos twice

3 years ago | [YT] | 158


Allow me to reiterate what I've seen said in earlier comments.

I like the way you introduce simple concepts and then slowly build on those concepts to make something complicated.

I also like how you're willing, once the concept has been explained, to then introduce integrated circuits which do everything in the one chip, to reduce both the size and the power consumption of the circuit, yet you don't "go overboard" with this approach, instead turning this into a Visible Computer where everything which is really important can be seen.

And a big thank you from me, too. I wait for each instalment of this series with eagerness and impatience.

3 years ago | [YT] | 59

Tyler Reeves

Logic design is freaking amazing! XD

3 years ago | [YT] | 22


The sign of a great lesson is when you (as a student) have that A-HA! moment right before the teacher tells you what the concept is. I clicked it was counting binary a thus program instructions at just the right moment. Fantastic.

4 months ago | [YT] | 3


Woah! This actually kind of blew my mind a little bit. The circuit is so simple and elegant for such a behavior, it's almost astounding.

2 years ago | [YT] | 4

Sebastian Scholle

How did you get all those perfectly fitting jumpers?

2 years ago | [YT] | 9


You're pumping out the videos lately, Ben - glad to see this. =D

3 years ago | [YT] | 41

Royal Aloha

Best teacher I’ve ever seen. First does something you know then shows you how to move from that to the next topic, making it more simple. Unlike some videos they just get to building circuits without explaining where they are derived!

4 months ago | [YT] | 1

heyandy x

This is one of those series I will be sad to finish ... it is taking self-control to not binge it as quickly as possible.

4 months ago | [YT] | 1


Anybody know a good replacement for the 74LS76? Little buggers were discontinued and are getting expensive and harder to find.

2 years ago | [YT] | 4


I am so excited you have kept this series running

3 years ago | [YT] | 7

Alex Gochenour

Mind: Thoroughly blown! Thanks Ben

1 year ago | [YT] | 1

Golden Zombie

I wish I could have seen my face when I realized what was happening! I made a counter using an Arduino and noticed how the speed was being halved. Really cool seeing the opposite in action :)

3 weeks ago | [YT] | 0


Ben, these videos are absolutely brilliant. I'm learning more watching your videos than I did in my digital circuits class :D

2 years ago | [YT] | 1


Wow!!! What the hell I can't believe something is as simple as this could be used to count numbers!!!!!

5 months ago | [YT] | 1

Matthew C

love these video because I'm taking a digital circuits class and it helps me understand more of what's happening. Ben, have you done things with fpga boards before?

3 years ago | [YT] | 1


Omg and just in time too :O ThANK YOU So MUCH

3 years ago | [YT] | 1

lukas russell

Ben I am so happy to see you back!

3 years ago | [YT] | 2

Kayden Deason

Love the vids, keep going

3 years ago | [YT] | 3