SR latch

Digital logic gets really interesting when we connect the output of gates back to an input. The SR latch is one of the most basic memory circuits that we can build on to make counters, registers, and all sorts of other interesting things.

You can get all the components used in this video from any online electronic components distributor for a few dollars.

Complete parts list (everything in this video):
1x 74LS32 (Quad two-input OR gate)
1x 74LS02 (Quad two-input NOR gate)
3x 330Ω resistor
3x Momentary "Microtivity 6mm tact switch"
3x LEDs
Solderless breadboard(s)
22 gauge wire
USB charger and cable or some other 5v power source

[ericparent]

Dear Mr. Eater, I've been watching your videos now for the past couple of days, and I wanted to give you a sincere thank you, from the bottom of my heart, for finally explaining the fundamentals of computer logic and, basically, how CPUs really work, deep down inside. Throughout my life, I've been fascinated with hardware and assembly programming. Your vids are the first explanation, whether it be a book, article, video, etc., that I've come across that actually breaks it down in a simple, clear, and easy to understand way. Again, Thank You!

[QDWhite]

6:46
"if we push this button..."
*Dramatic pause*
"Nothing should happen..."
*Pushes button, nothing happens*
"...and in fact, nothing happens!"

That was palpable. I really felt it.

[lidarman]

Ben, one of your teaching strengths is knowing the questions a student should ask but doesn't know to ask. For example. "Why isn't a current limiting resistor needed from the output of chip toe the LED?" Keep up the great videos. Well done in all regards.

[mancavemusician]

These videos are the benchmark of how electronics should be taught. If you were a teacher and I was back at school I listen to every word you have to say. Thank you

[human.earthling]

Thanks for building the circuits to go along with the logic. That really helps.

[andrewlydon]

*Never* have I seen electronics explained so well. I have been a programmer for 40 years with a hazy understanding of the 74LSxxx family and breadboards. If I had seen these videos 40 years I might have become and hardware engineer instead of a software engineer. Who knows? I am now addicted to watching these videos for my own entertainment and just for the shear wonder and joy of it all. Thank you Ben, you have made the world a better place.

[dines]

That´s exactly the art of presentations that i needed as a young scholar. Where were you my friend 25 years ago?

[nhuphan]

I was here 4 years ago for my first course in logic gate. Now, I am back here for my master's thesis to review. Thanks for the video.

[pedrinelastronauta]

Ben, these have got to be the best videos I have ever seen. Explained in full detail, and dumbed down to basic esentials. Thank you very much.

[redheadbrothers]

Oh. My. Goodness. This is actually crazy useful. I've only watched like four of your videos but already I want to know more. I'm especially curious about computer architecture and can't wait to see if you've talked about it!

[cowboyatthebebop]

Your breadboarding is so nice and clean, mine always ending up looking like a bird's nest lol

[philowen]

What an excellent video. Explained in a simple but precise way. Thank you.

[pratikbhetwal]

I have been wondering about the current flow in a SR latch for years now. Even my teacher could not provide me with a concrete idea about it. And you have cleared one of my biggest doubts in electronics. Hats off to you sir.

[flyingduckairsoft]

Sir I just want to say thank you so much, The 2 minutes of your video is better than 2 hours talks from my Indian computer science teacher!

[juniorjay]

Damn, one video better than multiple lectures and tutorials during the semester. Wish I had found this video before the final exam

[SimpleHumanInNY]

Beautifully explained and demonstrated, Thank you!

[qwertyuiop]

This came in my recommended. I'm studying Electronics at A-Level and I didn't really understand the concept in lesson. This is my first video I'm watching of yours and I have to say that this is amazing. You keep it simple yet say how it works, with schematics and demonstrations. I've basically revised a 2 hour and 10 minute lesson in just under 15 minutes. Thank you, I'm subbing.

[SajjadFilms]

I wish you were my course teacher. So much respect for you. The way you have taught us this is super helpful. Also thanks to the youtube algorithm for suggesting your video.

[CleridwenFR]

This channel is truly amazing. It really shows the power of the freedom of YouTube. Thanks a lot.

[melissam.]

6 years later and you save my life for my exam. I have no words… Thank you so much . I don’t usually comment but you deserve at least a like and a comment. Thank you so much from Switzerland 🇨🇭