How 555 timers Work - The Learning Circuit

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The 555 timer is probably the most common and popular IC to be used in hobby circuits. There are A LOT of projects out there using the 555 in various ways and it’s easy to find schematics to make a project that has already been proven. But rather than just taking plug and playing circuits with the 555 timer, Karen wants to give you the chance to understand the why of what’s happening when you use the 555 timer. In this episode, Karen breaks down what is happening inside the 555 that makes it function. Learn how the inputs interact with the supply voltage to trigger and reset the output high and low. Find out which pins can be used to adjust the threshold at which that change happens. And see which familiar components can be found within the 555: bit.ly/2rE5rMD
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6 июн 2024

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Комментарии : 391

@migalito1955 4 года назад

Very nice tutorial, especially given it can be configured 3 major ways. I am a math guy that hobbies in electronics and studied the 555 a few months back. It was nice that your video mentioned that the integrated flip flop actually used only one of the outputs which is a detail that often is overlooked in other explanations. I ended up building an astable Multivibrator so that I could put out a weak signal in the AM broadcast band spectrum in order to test reception capacity on regenerative radio receivers that I assemble from parts at hand. It worked, barely. By barely I mean that high a frequency was kind of pushing my luck. Without filters it was also broadcasting everywhere much like a skipping stone across a pond.

@alexvonbosse5090 4 года назад

this is one of the best explanations of the inner workings of the 555 timer that I have seen in a long time!

@antonnym214 4 года назад

First time I've seen an understandable description of this chip. Thank you. By the way, I have a friend who says he's bistable, but practicing as monostable because it's just easier to live that way. All good wishes!

@MAYERMAKES 4 года назад

i used them a lot but never looked closely opn how they work, very informative, thx Karen!

@Dingomush 3 года назад

I’ve watched four different explanations on the NE555 internal workings and so far this one has made the most sense. A bit fast in places but it’s a video, I can go back and watch it again and try to pick up what I’ve missed. Thank you so much for your time and expertise on the subject matter and for “dumbing it down” in plain words and diagrams so that more people can enjoy electronics.

@TCGCEOGuy 4 года назад

Great job Karen! Wonderful job explaining. You are getting very good at quality examples and the discussion of complex items.

@solapowsj25 3 года назад

This is one of the best presentations for working of the 555. We've used the 556 as astable and monostable together to produce a PWM signal for a Boost Converter, 12v t0 48v DC at St. Joseph's Research, BLR, IN.

@mehran_sk 3 года назад

I have seen so many videos about 555 in my native language but somehow they were confusing until i found this video simple and understandable even with a foreign language description

@gamergamer6241 Год назад

Great channel! Your explanations are so clear

@armincal9834 2 года назад

I'm by no means an expert in electronics yet the way you explained it was so good that even I understood everything.you deserve a sub

@LeoStarrenburg 6 месяцев назад

A good 50 years ago I started in electronics making my first medium wave receiver with an ECC82 valve. A year or two later, in 1972 the 555 was introduced and I've been dabbling with it ever since. Thank you Hans Camenzind ! Nice video BTW 👍.

@cep5618 2 года назад

I've never seen a high quality explanation like that. Congrat!

@Inquire98 4 года назад

"Thank GOD", and thank you, thank you very much for your presentation 😉 REALLY Really really good 😎

@fieldsofomagh 4 года назад

Nice presentation, Karen and thank you for the information on the internal operation of the 555 engine.

@Rodderick45 4 года назад

Fantastic job done! Well defined and explained. She is great!

@hubenbu 2 года назад

Finally I get the hang of the circuit inside NE 555. Thank you!

@spudnickuk Год назад

This has got to be the best video i have seen that explains how to use a 555 chip with proper illustrations of how it works

@davidcross30 3 года назад

Awesome thanks. Very well presented and I’m looking forward to learning more now!!

@lucyalicenox5871 2 года назад

Thank you so much for helping me figure this out!!!! It took me a long time to conceptualize how ICs work

@seuyt88 2 года назад

So excellent in explaining!!Coming upon a female electronics engineer made this more exciting to learn. Good for you, indeed! I thoroughly enjoyed this!!

@IFixOldStuff 4 года назад

Great work here showing how the basic building blocks become more complex circuits

@_aakash.a5548 3 года назад

I usually don't leave a comment for most of the videos but this one was Awesome explanation

@sinewave3323 4 года назад

Thnx a million for you're videos! I really appreciate them! Alot! 😎

@stever3886 Месяц назад

Well arranged presentation! Lots of good points for operation and I will watch the modes presentation next!

@eddierestauro277 3 года назад

I allready use this when i made an inverter 12volt dc to 220 v ac since 1995, i was happy that it's clear explanation thank karen, thank yuo very much....

@koszynek 4 года назад

Super prezentacja, doskonale wytłumaczone. Dziękuję.

@REXXSEVEN 2 года назад

Do you see anyone else here speaking that?

@zetaconvex1987 4 года назад

A little bit fast in places, but a very useful video nevertheless. It certainly helps to demystify what's going on in the chip.

@ICONICKABIR 4 года назад

Awesome tutorial I m new to electronics but well understood thanks Maa'm

@claytonbenignus4688 4 года назад

Great Graphics!!! Contrast and highlighting is properly used without unnecessary distractions. The “ how it works” part is fascillitated by Karen, who shows both Teaching Experience and Knowledge of the subject. As a Presenter, she is comparable to Liliana de Castro, who does Group Theory for Socratica. All pins were covered without the dismissive “ this pin is seldom used” . I hope to see Karen in more videos.

@jimhenderson2308 2 года назад

Great video. I’d also add that the rs latch is basically an electrical version of a mechanical toggle switch. But unlike the mechanical toggle switch the rs latch has 2 dedicated physical quantity inputs (either high or low) to change the state of the output. The mechanical toggle switch has a single algebraic input consisting of the application of a + force or a - force to change states. This 555 timer is an example of an application of the rs latch thru the use of the 2 comparators assigned to each of the 2 physical quantity rs latch dedicated inputs. Such a configuration can be used for automatic temperature control as set with a thermostat . And so that’s potentially an additional practical implication (besides an oscillator) of an rs latch configured with a couple of comparators to change states to turn furnace on or off to reject heat loss effects thru the walls of a heated building. Unlike the oscillator both the period and duty cycle of the 555 output behavior in the furnace example will change depending on outside temperature.

@Shlovanzleeat 2 года назад

Wow, I wish I had a teacher like you, decades ago. It could've been career changing. Nice to learn the basics. Kids these days leap jump straight to a raspberry Pi and they find basics, pointless.

@Gliese667cc60 Год назад

I loved your way of explaining...Very grateful!

@element14presents Год назад

You should consider checking out DC to Daylight too: ru-vid.com/group/PLwO8CTSLTkiiBLUDE3vfOGjvIuQONT4AC

@tcroyce8128 2 года назад

Loved the presentation for the schematics.

@anthonyshobbycorner 2 года назад

What an amazing video explaining the workings of the 555 ... So well explained .. Gave me a far better understanding of it ,and how to use it , in all 3 forms ... Excellent video .. I also checked out the 2nd video you did as well .. Regards, - Anthony

@user-ep5vb2rq4f 7 месяцев назад

Great explanation, Great visualizations, Great tutorial. Thank you very much for this.

@element14presents 7 месяцев назад

Glad it was helpful!

@WACkZerden Год назад

Thank You, this was a great intro video.I found Your explanation easy to follow and understand!

@MsRamesh21 2 года назад

Wow! great to find this channel. Superb explanation

@markedwards4879 2 года назад

I wish we’d had resources like this when I was studying Electronic Engineering and building 555 circuits back in 1981! Such a great little timer, I built all kinds of alarms and flashing lights etc with them, but getting across all of the concepts etc was much more of a dry subject than it is today. I really like how simple and clear you made this for people starting out. Great stuff.

@larrybud 2 года назад

I mean, that goes for any tech, right? I learned programming in the 80s, and you'd buy a single book on a single topic, for 80 bucks.

@awaitingthetrumpetcall4529 2 года назад

@@larrybud I'm 68. In the 70's they had mainframe computers behind glass doors in my college that ran tape. I thought writing instructions with zeros and ones was tedious. In 2008 I discovered I could control the behavior of motors by writing instructions. I was hooked and realized I had wasted my college career.

@markedwards4879 2 года назад

@@larrybud I still have some of those overpriced and dull books on the shelf lol. There was very little choice of content at all and most of it was presented in a way that made things more difficult than they needed to be. I don't know about you but I had a mix of some very good lecturers and some that were just terrible. Luckily I worked with some very helpful people while studying and was given projects that helped me learn and keep it interesting.

@markedwards4879 2 года назад

@@awaitingthetrumpetcall4529 In the early 80s I was initially more interested in electronics (and cars/motorcycles lol) than computing but got exposed to personal computers as well as the mainframes in the telco space. In the early days most of the electronic projects that I built for myself were for cars and bikes - I built a full car computer that monitored fuel consumption and distance etc, car and bike alarms, electronic central locking. I got into computing outside of work in a big way when the Amiga 1000 came out (prior to that had a z80 machine at home), but the Amiga was a game changer. It could be programmed to play music properly and could display quality photos - something that the IBM based business machines just couldn't do.

@awaitingthetrumpetcall4529 2 года назад

@@markedwards4879 I would have seen you as as an intelligent nerd. My only involvement with computers was playing "Pong".

@bru2al1tyusa82 4 года назад

I think this series is a great idea 👍

@LeventeDaradici Год назад

it is explained superbly! thanks and respect!

@richardpayne9640 2 года назад

I would have to put this to practical use to get this into my memory Thank you!

@aryanabdolahi8469 3 года назад

Thanks for the video. I learned and enjoyed.

@victorkuznetsov8657 4 года назад

Thanks a lot for detail explanation!

@solarflare4259 2 года назад

Nice vintage scope in the background.It seems to be a Tektronix...Great, detailed explanation of the 555...Thank you for posting.

@jsims2985 2 года назад

Very well done. Thanks so much!

@tamarabarnett9869 Год назад

Loved this. Thank you.

@tusharpotdar5762 3 года назад

Very nicely explain the working of 555, love u thanks

@apnamultitech786 2 года назад

I like ur way to explanation in detail, thanks

@guilletrost1319 2 месяца назад

the best ... simple and clear, applause...

@vmsrao2125 11 месяцев назад

Excellent explanation madam.Thank you very much

@robinhood007ful 2 года назад

Very good explanation of working

@JohnClulow 4 года назад

Excellent tutorial !!

@SamFugarino 4 года назад

One of your best videos.

@Valleedbrume 4 года назад

Arguably the most used timer ever.I started using this in the 70’s.(okay I just dated my self:-)Great explanation.!

@gregbrockway4452 4 года назад

Don’t feel bad, me too. One of my favorite ic’s.

@michaelpesce9235 2 года назад

Very interesting tutorial, thanks for sharing😁

@RI-ns8wz 2 года назад

Superb, Milady! I always have some..10 or 15 of them in mi parts bin. I had even made some NCG control boxes for cars and there They are, working almost 10 years later! I had a book (ugly, fat,big book) that I can't find nowadays, about the 555, and it stated somewhere; "555's are like rice....there are more than 1000 recipes wit them!". Thanks a lot for your videos! And "hi.5!" from Argentina!

@johnchildress6717 2 года назад

556 can be used for many circuits.You probably know but others might not.2 555,s on a single chip was a good idea.

@oompaloompa7280 2 года назад

This is the first video I watched from you and I loved it. I used the 555 many times over decades but never understood it in such depth. Very useful and helps with troubleshooting circuit design. One thing I may not be understanding is that when you said that when pin 4 is grounded, the transistor turns off. Being a PNP, shouldn't it come ON when the base is brought to ground? Maybe i misunderstood?

@theinkyaw3640 3 года назад

thanks for your lectures

@christopherbrown3614 5 месяцев назад

Thanks for the explanation!

@M4U999 19 дней назад

your explanation is perfect

@khan691 Год назад

Excellent learning program 👍

@HS-eq3gk 4 года назад

good video, easy to follow

@subhadeeproychowdhury1059 4 года назад

Really good presentation

@ShakilShahadat 4 года назад

Brilliant explanation.

@sushilchoudhary5749 2 года назад

Very very thanks for informative video.

@murrrr8288 3 года назад

really good video, thanks!

@abhijitbhujel1418 3 года назад

Very Good explanation.

@arunk8663 2 года назад

Wow fantastic explanation thank you,

@engsamhar6353 Год назад

very excellent tutorial

@johnthomas5166 4 года назад

Yup, that didn't even bump my head as it went over. Her well executed explanation still left me just as confused as whence I came. I just need a 3 second delay on a 12 volt circuit.

@smirksabre612 4 года назад

Well great explanation about 555

@bestbestchannelupcoming 2 года назад

Thank you for the video.

@juliuscesar4176 2 месяца назад

this is better than the videos that just show projects with the 555

@gaminghighpriest5293 Год назад

omg finally a fully detailed tutorial for people who hav 0 knowledge

@Bianchi77 5 месяцев назад

Nice info, well done, thanks :)

@anasasim3856 Год назад

Man you are soo good! Thank you!

@danielramirezcruz.2209 2 года назад

Fantastic video great information l love it thanks for posting...

@irynathebeauty 3 года назад

great explanation!

@mahyarshokraeian 3 года назад

amazing explanation.

@clintestood5839 3 года назад

Thanks for presentation

@emorag 3 года назад

Great video!

@shielapelayo9322 3 года назад

nice discussion..thanks! keep it up

@roneyalbirto6667 3 года назад

keep up the great work . you are awesome

@jimmym2719 2 года назад

thanks for sharing , very well presented and understand, ❤️ to u .

@petrosanastasiou3243 2 года назад

Nice job and presentation! Can you give some kind of advise for something more complicated i.e. PS21245-E (intelligent power Module), how I could drive it & control it with a simpler circuit.

@shredder60 2 года назад

Very well done

@marksminis 2 года назад

LoL. And all through college we just slapped them in and looked up what C and R needed to be. Never dug inside them like this, thanks!

@johnmarks714 2 года назад

Awesome stuff. I hope you cover how the 6502 cpu works one day.

@flamencoprof 2 года назад

I am so old I had forgotten when I was taught about this cct. Now I am not sure if I understood it then nor if I cannot understand it now. I am looking forward to seeing how the application of its properties is done.

@madhupathiyil9251 Год назад

Good information 👍👍

@dudipallabharathkumar5973 3 года назад

Super explanation ..

@lmwlmw4468 2 года назад

Great video.

@MrCardeso 4 года назад

Thanks, Karen!

@clayz1 4 года назад

My one and only breadboard slash 555 timer electronics project. Has a battery, a pot, an on off switch and a variable time on off LED. Cool.

@GlynWilliams1950 2 года назад

Very useful We call it Triple 5 (timer), in my area in Australia We also say 5k (for the resistor, five Kay), We are already metric so we understand 1K etc

@Decco6306 4 года назад

Thats the best internal diagram ive seen of a 555 yet

@augustograton8958 4 года назад

Thanks Karen !!!

@harriusk4u 4 года назад

Incredible lecture! Just have a question. What is the triangle attached to the output pin? Look like it inverts the !Q output.

@maker_karen1785 4 года назад

That's exactly what it is, an inverter.

@ab_ab_c 2 года назад

Wow.. Now that's a video that will have to be rewatched a few times to understand... A common use example circuit (e.g. voltage freq converter, freq modulation, etc) would have been useful. :-) Thanks for sharing!