How a 555 Works as a Timer.

Рет қаралды 95,716

Күн бұрын

In this video I explain the building blocks of a 555 chip and how it interacts with the components you connect around it to become a “Timer”!
I talk through each stage of the 555 including
- Voltage Divider (comprising of three 5K resistors)
- Two Comparators
- The Flip-Flop
- NPN and PNP Transistors utilised for Discharge and Reset
We explore the Charge and Discharge times as the capacitor oscillates between the 1/3rd and 2/3rd voltage levels and verify that with an oscilloscope.
If you are interested in the handy configurable Resistor boards I utilised you can purchase them from Amazon here:-
amzn.to/3RYiX75
For more information about Voltage Dividers, see one of my previous videos here:-
• What Are Voltage Divid...
Timeline
-----------
00:00:00 - Introduction
00:00:59 - PKAE Electronics Intro Theme
00:01:09 - Internal Stages starting with Voltage Divider
00:02:29 - Two Comparators
00:04:16 - Control Voltage Pin
00:04:32 - Flip-Flop & Output Driver Stage
00:05:40 - SR Flip-Flop Explained
00:07:27 - NPN Discharge Transistor
00:07:50 - PNP Transistor for External Reset
00:08:14 - Summary of Stages
00:08:39 - Comparator/Flip-Flip Experimenting (Theory)
00:15:54 - Comparator/Flip-Flip Experimenting (Bench Testing)
00:17:58 - Astable Circuitry - External Capacitor and Two Resistors
00:21:20 - Bench Testing Astable Mode
00:22:48 - Datasheet Astable Circuit Diagram
00:23:27 - Control Voltage Capacitor (Stability)
00:23:53 - Timing Calculations (On and Off Times)
00:25:41 - Bench Testing Timings with Oscilloscope
00:29:06 - Timing Summing Up
00:29:17 - Frequency Calculation
00:30:12 - Wrap Up.

Пікірлер: 513

@dougtaylor7724 17 күн бұрын

Back years ago when I taught myself electronics I bought one of the multi purpose board kits you can use to make 200 or so projects. When I played with a 555 that was the most amazing chips ever. Make timers to turn on and off at different times.! Once made a timer that took a month to turn on. After calculating the resistance and caps it was put in the living room and did nothing. Just sat there waiting to trip on. The wife thought I lost my mind. One Saturday about 4pm it came on. The timing was about 6 hours different from what I calculated. But, it was amazing a $1 circuit went off that close after 32 days. And I made it do that! The wife really thought I had lost it then. 😂

@paulpkae 17 күн бұрын

Haha! Brilliant! that made me laugh, thank you.

@jasonbender2459 17 күн бұрын

Your timer was 99.24% accurate. Well done. Your wife does not deserve you.

@jagmarc 17 күн бұрын

@@dougtaylor7724 In the late 70s a colleague did a industrial controls dosing pump driver which used a simple RC timer with insane long period and being inexperienced, he didn't realise after it left assembly line no one in Functional Test wanted to wait a week ten days whatever it was. So the boss had to change the timer to something actually measurable and added a CMOS divider IC patched under PCB. We called the guy The 555 Kid after that.

@Mike-H_UK 16 күн бұрын

It is normally not a good idea to try and make very long delays (say greater than an hour) with a 555 directly because leakage in the capacitor tends to dominate the operation at such low charging & discharging currents, and the circuit is very sensitive to noise close to the comparator trip points. Adding a divider (as also suggested) makes operation much more dependable. Still, I had great fun s a kid learning these things for myself!!!

@Patrik6920 16 күн бұрын

Fantastic... ya u can do all kinds of fun stuff with just a very few chips...

@Enderbro3300 12 күн бұрын

PLEASE I am BEGGING explain op amps like this. I feel like a BARELY understand them and this video made me feel like I can explain a 555 to a toddler!!

@paulpkae 11 күн бұрын

Hi. Yes, an Op-Amp explanation will be essential content for my General Electronics collection. It is on my long list to do.

@JamesHarr 6 күн бұрын

I think this is an excellent explanation of op amps, at least when they don't have any direct feedback loops. Op amps get weird (and interesting) when there is a feedback loop involved. I can't remember who explained it or even the specific circuit configuration, but when the feedback loop is involved, "the opamp will do as much as it can to equalize the input voltages" and that's what stuck with me. I look forward to Paul's explanation of opamps because I think it'll be even more clear than that.

@paulpkae 6 күн бұрын

@@JamesHarr challenge accepted 😲

@JohnDoe-lg8dr 5 күн бұрын

@@JamesHarrThe way that I learned op amps was that the op amp has variable gain internally and through magic will change the output voltage to make the two inputs equal. Then assuming the two equal inputs, you can find the desired output voltage. Slap on a capacitor or inductor and you now have an integrator or differentiator

@MrThedennisblack 17 күн бұрын

It’s exactly this kind of thing that we dreamed the internet would do for us - let people freely share their talents and knowledge with each other. Great explanation and video! Taking the time to briefly explain how the comparators worked and how the flip-flop worked is the exact kind of thing someone who doesn’t have natural teaching ability would have skipped completely.

@jaykoerner 17 күн бұрын

You just have to wade through the ai generated fake videos, completely lose your privacy to multiple gigantic corporations and be completely unsure if your even talking to a real person since 25% of Internet traffic is scammy bots and another 25 is supposed good bots

@paulpkae 17 күн бұрын

Thanks. I find sharing knowledge to be very rewarding. All your comments make the effort all worthwhile.

@arosnett 13 күн бұрын

Word!

@newmonengineering 19 күн бұрын

This is the best explained 555 timer video ever. I understand what it does already high level and how to figure out the numbers but I have never seen all the internals so completely discussed and stepped through like you did. Brilliant work! Absolutely love electronics so throughly explained with real world results like this. Keep it up! And thank you for a more indepth understanding.

@paulpkae 19 күн бұрын

Many thanks for your great comment.

@qlue7881 17 күн бұрын

I agree I've been doing electronics as a hobby since the late '80s and read many articles on this IC Today I understood, for the first time, why a 555 can't give perfectly symmetrical square waves

@paulpkae 17 күн бұрын

@@qlue7881 thanks for the comment. A video on how to achieve 50% (or higher) duty cycle is coming, if that's what you mean.

@paidaki11 16 күн бұрын

😊😊👍👍🙇🙇🙇🙇🙍🏾‍♂️❤😅❤❤😮

@karlsangree4679 18 күн бұрын

This might well be the best explanation of an electronic component I have ever seen. This is "Electronics for Dummies" which is exactly what I need. I just went to his main page hoping and praying that he had a complete "Learning Electronics" tutorial but alas...😥

@robr4662 18 күн бұрын

More like electronics for someone who is casually familiar with how electricity works. If someone was truely uneducated about any electrical theory, this video would be useless. That being said, this video explaining a 555 timer is better than any other video I have seen on the subject.

@paulpkae 17 күн бұрын

Hi thanks for the comment. My channel is quite new and small at the moment, but I have much bigger plans for it. and any more videos will be coming. Please make sure you Subscribe if you want to support. Thank you.

@paulpkae 17 күн бұрын

@@robr4662 thank you.

@JohnVance 16 күн бұрын

@@paulpkaeSubscribed, thank you!!

@flyddw 2 сағат бұрын

That was the absolute BEST explanation of the 555 chip. As a wannabe EE major in college - I gave up on the math and continuous curves and chose CompSci instead. However - if you were my teacher, I definitely would have stayed in. Brilliant!

@katelikesrectangles 7 күн бұрын

this is the first time this chip has ever made sense to me, i never understood what it was doing inside. it was always explained to me as how to *use* it, not how it *works*. thank you so much!!

@paulpkae 7 күн бұрын

That's Great! More videos on the 555 coming, so make sure you Subscribe. 😀

@katelikesrectangles 7 күн бұрын

@@paulpkae oh this was an insta-subscribe for me, you've solved something that's been a mystery at the back of my mind since the '90s, where i felt like it was just my fault for not getting it. and i just never realised it could actually make sense

@brainforest88 17 күн бұрын

I am 61 an I am used the chip when I was 17. Didn‘t know this chip is still around. Nice!

@c1ph3rpunk 17 күн бұрын

It’s still all over the place.

@paulpkae 17 күн бұрын

Still going strong and now manufactured by many companies and in various form factors, TTL, CMOS. There's even a dual 555, namely the 556.

@rfymf 14 күн бұрын

60 y. o. here... same. Designed and built a digital clock around it at 15. With the additional 74something nand gate ttl chips, it had the accuracy of 1 min per hour, and drained C batteries in a couple of hours...

@numbr6 13 күн бұрын

Of course it is still around! I've got a bunch of them in my drawer of digital chips, along with my TTL and CMOS series chips. I first started tinkering with this chip from the TTL Cookbook, author Forrest Mims published by Tandy/Radio Shack. I've still got my copy of that book along with a bunch of chip pack cardboard "data sheets" stapled to the inside cover of of this book. Back in the 70s/80s, getting data on chips was hard. You kept those precious package data backs, and was very familiar with the Reader's Guide to Periodic Literature, and microfiche film at libraries to get data. Now it is just a Google search away, or a visit to Digikey! Technology has made some things easier.

@ezemeza1363 12 күн бұрын

I am 31 and getting started into electronics. This chip is very useful and cheaper than programming and Arduino

@craxd1 Күн бұрын

A good lesson for electronic students on solid state logic. Well done. When I went through school, everything was shown on a blackboard.

@paulpkae Күн бұрын

Thanks for the comment,

@AnimationGoneWrong Күн бұрын

I have to say this is THE most well done, clearly explained explanation of a 555's operation I have ever seen... and I've seen a LOT! I especially liked how you showed the actual charge/discharge of the capacitor on your 'scope. Nice touch! It's nice to see you explain that, on it's own, the chip is NOT a timer at all... it requires external components to become one. I had also heard that the designation (555) came from the 3 5K resistors in the voltage divider chain. I hope whoever invented this wonderful chip got some HUGE recognition for it. It has probably had the longest useful life of any chip on the planet! Over 50 years!!!

@paulpkae Күн бұрын

Thanks for the comment, much appreciated.

@billdevany3303 18 күн бұрын

your addition of the color gradients was a real game changer for me. thanks for this. Well done!

@paulpkae 18 күн бұрын

Thanks. An additional bit of effort can make a lot of difference.

@techtopics5782 15 күн бұрын

this is honestly the best explanation I have seen on the 555 and its operation. The explanation + visuals + calculations + breadboard + scope with comparison = awesome. I like that math!

@paulpkae 14 күн бұрын

@@techtopics5782 thanks.

@odbo_One 2 күн бұрын

This is the first IC I grew up learning. It all took off from there, good times. I may relive that. I still have at least 10x 555 and 10x 556 IC.

@KatyInesSB 19 күн бұрын

Never see a video about 555 well explain. Amazing. Keep me on screen to understand this chip, and how they work.

@paulpkae 19 күн бұрын

Glad it was helpful!

@user-vs9oq8cd8l 2 күн бұрын

I remember back in the 70's with my father in his ham shack bread boarding a nixie tube light sequencer based around a 555. Thanx for the memory.

@paulpkae 2 күн бұрын

Great stuff!

@athousandprojects 16 күн бұрын

I think this is the best video about how a 555 works I've ever seen.

@paulpkae 15 күн бұрын

Thanks so much.

@user-rl5zj7np4e 13 күн бұрын

A Masterpiece for electronics engineering teaching. Bravo!!

@paulpkae 13 күн бұрын

Wow, thanks!

@TheRandomDave 16 күн бұрын

Adding my voice to all the others...absolutely brilliant job explaining and demonstrating the 555 timer.

@paulpkae 16 күн бұрын

Glad you liked it!

@remi3741 17 күн бұрын

like in the comments already i to never saw a video so well explaned about an electronic divice. fantastic. i wish more people would do it like this on more components or cicuits. its fantastic for biginners and hobby. thank u so much.

@paulpkae 17 күн бұрын

thanks so much for your comment. I'm glad you found it useful.

@tedbastwock3810 19 күн бұрын

What an amazing video. I have watched probably 2 dozen 555 videos recently, none are better than this. Visuals are great. Was also a very good explanation. You managed to make an entertaining and informative video on something that already has a lot of videos on it but with a unique and useful twist. E.g. I never took the time to figure out exactly how the astable mode works, and I'm very glad you walked me through it here. I haven't seen anyone else do that, and I'm glad you did. I cant wait to see see your other 555 videos that you mentioned at the end. Thanks for sharing.

@paulpkae 19 күн бұрын

Many thanks for your comment. More videos coming......

@dustinduncan2444 16 күн бұрын

Brilliant video. I was surprised that I could watch this length of video on the venerable 555 and not find my mind wandering. It's a testament to the ability to teach and keep people engaged in the content. I really appreciate breaking down the pins and how they are related without just glossing over why a given pin is connected to a specific point in the circuit. The color coding of the internal and external voltages along with the logic level changes definitely made it easier to follow what was going on. Bonus points for building up the bench demo from a couple LEDs to the oscilloscope traces that took the diagrams from a simulation to the real world.

@paulpkae 16 күн бұрын

Thanks for your comment. It took quite some effort to put this together to be honest, but I am please with the outcome, especially all the comments like yours. Please remember to Subscribe, if not already. 😁

@squelchtone 13 сағат бұрын

As a visual learner, this helped me a lot.

@paulpkae 11 сағат бұрын

Great! Glad it helped.

@rv6amark 3 күн бұрын

Well done. Good graphics, good explanation. Every time I work with a 555, I have to relearn how it works. Now I know where to go for that information.

@paulpkae 3 күн бұрын

Thanks 👍

@gedtoon6451 19 күн бұрын

Great in-depth video on the 555 in astable mode. A follow up video could cover monostable mode. This would explain why the designer of the device didn't just connect trigger and threshold together inside the chip.

@paulpkae 19 күн бұрын

Thanks for your comment. I do intend doing some follow up videos to this. My very next video however is going to be a review of a nifty digital microscope.

@javiermitchell7073 16 күн бұрын

Really well explained. This must have been one of the most " mysterious" circuits I came across when I was a youngster!

@paulpkae 16 күн бұрын

Thanks. Glad you enjoyed.

@jerrywright9657 Күн бұрын

In 1980 I used a thermistor in the timing circuit to produce a temperature sensitive pulse duration. That pulsed a milliwatt CW transmitter so I could remotely get temp data by monitoring time between pulses. That got implanted in free ranging woodchucks so we could monitor location and hibernation status.

@markramsell454 6 күн бұрын

I used one of these for a 1Mhz clock on a 6502 board I made. It worked just fine. Nice description, very thorough.

@paulpkae 6 күн бұрын

Very nice!

@tlum4081 9 күн бұрын

i once worked for a small company whose main "electrical engineer" only knew relay ladder logic. I designed a simple 555 circuit operating in a sequence to signal solenoid air valves to open to blow dust from a multiple dust bag system into the waste bin. Worked like a champ. They thought it was the cat's meow.

@paulpkae 9 күн бұрын

Brilliant!😄

@MarkALong64 17 күн бұрын

That was an enjoyable trip down memory lane :) I once met a very excited chapin the gents of a Southampton pub who had designed the timer circuit for the hot air hand dryer using an NE556 and for some reason, he really wanted to explain the circuit to anyone who would listen.

@paulpkae 17 күн бұрын

From my experience, those hand dryers must have the wrong size capacitors in them then . 😆

@YodaWhat 13 күн бұрын

It is worth mentioning that the Control Voltage *pin, #5, is also known as the Pulse Width Modulation pin.* I have had great fun playing with that function, even turning a CMOS 555 into a Digitial Mode audio amplifier with pin 5 as the audio input! A couple of extra components are needed beyond the usual few for a simple timer: an external transistor to make the duty cycle 50% ON and 50% OFF, plus an inductor to knock out the high frequency elements of the output signal, and a small capacitor on pin 5 to give DC isolation from the audio source. I set the oscillation frequency to be 2 MHz, which is only possible with the CMOS 555. That meant each wave of the audio input was _in effect_ 'sampled' 100 times (for 20 kHz audio), and 100,000 times (for 20 Hz audio), giving high fidelity to the *_implicit_** A-to-D conversion* and to the audio output. 🙂

@paulpkae 13 күн бұрын

Thanks for sharing your knowledge.

@MrHyde-wv8wi 2 күн бұрын

The Good old 555. Big thumbs Up.

@GrandsonofKong 8 күн бұрын

Great description and video! 555 was developed by Signetics founded by some former Fairchild Semiconductor Engineers (like Intel was). I worked at National Semiconductor (just around the corner from the Signetics Plant) and we called it the "Triple Nickel" at least in our department(Test Engineering) when NSC decided to second source the 555. Still have a Signetics Apps Book on my bookshelf and a very useful chip when the only option was a bunch of TTL Logic to do timing when you could get away with only a few external components back in the day.

@paulpkae 8 күн бұрын

Thanks for the comment and your interesting history insight.

@gunblad3 3 күн бұрын

Where were you when we were learning circuits…. Thanks! Enjoyed learning what they should have taught us

@paulpkae 3 күн бұрын

Glad you enjoyed it!

@Mitch3D 17 күн бұрын

Thank you for this explanation and demo! I only really learned how to do microcontrollers with electronics so finding out other uses for simpler components is useful. One use for the 555, instead of a capacitor and voltage divider, you could use a thermistor to vary the threshold voltage based on temperature and tie the output to a relay to turn on a heater, you have made a simple bang-bang control loop.

@paulpkae 17 күн бұрын

Thanks.

@jeffspaulding9834 15 күн бұрын

People say it wasn't named after the 5K resistors because that's what the inventor of the 555 said in an interview. It was named by a marketing fellow who thought "555" was catchy. Brilliant video, BTW.

@paulpkae 15 күн бұрын

Yes, I have heard that too, but for me it seems too co-incidental. Thanks for the comment.

@matousejem 10 күн бұрын

Maybe the marketing fellow saw the schema and got the idea.

@peircedan Күн бұрын

@@paulpkae You may think it is too coincidental but it don't know any reason to think it is not a simple coincidence. Historically there was no logic for how these early ICs got their number designations. As far as I know it was generally mostly chance. The 556 is essentially two 555s in a single package. There is no difference in the resistor voltage divider. I don't recall hearing anyone speculating where the name came from back in the 70s or early 80s. No one questioned where 7404 got that designation either. Engineers just like to number things.

@mistaecco Күн бұрын

I've never stuck through with properly learning electronics on this level, but have found reasons to solder and build anyway. This was brilliant. Perhaps I'll end up brushing off one of my kits!

@paulpkae Күн бұрын

Glad you liked and thanks for the comment.

@BoukeGroenescheij 11 күн бұрын

Wauw, even though there are over 300 reactions telling you this is the best explanation ever seen, I'll just add another one. What a great explanation, one of the best 30 minutes on KZfaq :-). Thank you for sharing, I've subscribed!

@paulpkae 11 күн бұрын

Great! Thanks for watching, the comment and even more for Subscribing.

@fshieldsii 17 күн бұрын

First time you've shown up in my feed. Your explanations and presentations are so good that I've subscribed!

@paulpkae 17 күн бұрын

Brilliant! Thanks for subscribing.

@RexxSchneider 15 күн бұрын

The NE555 bipolar timer has an output stage that produces a significant spike of current as it switches, and that can cause problems both for itself and for nearby ics as it tends to produce a negative spike on the supply lines. It is pretty essential to place a ceramic 100nF capacitor across the supply pins, close to the ic to suppress that. It's not so necessary if a CMOS 555 is used. It doesn't matter for the astable circuit you show, but for use as a monostable, or other circuits, it's worth knowing that the TRIG input (pin 2) overrides the THRES input (pin 6), which means that if the TRIG input is held low, the output goes high and the THRES input cannot reset that by being taken high.

@robandsharonseddon-smith5216 17 күн бұрын

Loved it. Took me back to my teens in the 80s. I never understood it then tho. More like this please

@paulpkae 17 күн бұрын

Thanks for the comment. More videos coming....

@Electrodoc1968 16 күн бұрын

Nice to hear this explanation lives on.. PNP & NPN Was one of the first things I was taught when I was in a YTS T.V. Engineer training apprentice. ~1986 + Point iN Please & Not Pointing iN. Project building hobby led to a self taught knowledge of the voltage polarity workings for basic switch amplification. ie. PNP = A Positive on the Emitter then the base should be held Negative 0v to switch the collector through to the Positive. NPN = A Negative on the Emitter then the base should be held Positive to switch the collector through to the Negative. Basic relay type stuff. But also a general rule in amplifiers but that gets more datasheet reliant for HFE values etc. Cheers.

@paulpkae 15 күн бұрын

Thanks for the comment.

@jupa7166 11 күн бұрын

It is a brilliant chip design, sooooo versatile! I like it very much. I also like LM10 - look it up, the datasheet just oozes with ideas.

@peterwadham7965 13 күн бұрын

I agree this is one of the best explained 555 timers vides that I have seen, I remember looking at the timer at college and it seem difficult to understand as we had was the RS data sheet written by electronic professors

@paulpkae 13 күн бұрын

Thanks. Brilliant comment, encourages me to produce more....

@dingledodger5323 2 күн бұрын

I... Need you... To watch Kindergarten Cop with Arnold Schwarzenegger and watch for the lines "It's not a tumor". Then read your thumb nail. Absolute gold

@paulpkae 2 күн бұрын

Yes, several people have commented that :)

@AvastAntiPony9445 11 күн бұрын

Ok now it makes tenfold more sense to me why it's called a 555, genuine surprised i haven't heard anyone explain it till now, and that everyone calls it a "timer" chip.

@josephthibeault4843 7 күн бұрын

I love the 555 many applections think out side the box!

@alexcrouse 16 күн бұрын

I once found a single chip circuit board controlling the water level in a tank. Very very old system. I asked the maintenance grey beard why they had a microcontroller instead of a PLC. He laughed. "That's a 555!" With some resistor magic and a variable resistor on a float, they set the low level to report 3v, and the high level to 6v, and the 555 triggered the fill valve.

@paulpkae 16 күн бұрын

Thanks for sharing. I'm sure there's been millions of different 555 implementation types over the years.

@Ancipital_ 17 күн бұрын

Thanks, I will need to watch this a couple more times to completely understand it. I'm a bit new to elecronics!

@paulpkae 17 күн бұрын

@@Ancipital_ thanks. And yes, watch a couple of times or more and it will sink in.

@LonnonFoster 15 күн бұрын

Brilliant explanation! It's not often I find any material that blends theory and practice so well. Your shifts between diagram, breadboard, and oscilloscope are beautifully timed in the video; this is the clearest I've ever seen a 555's operation described. Thanks for taking the time to craft such an excellent video!

@paulpkae 15 күн бұрын

Glad you enjoyed and thanks for the great comment.

@arthurmoore9488 12 күн бұрын

Commenting before I watch the video. Bet it's going to be how the 555 is really a dual comparator with some nifty tricks. The "timer" bit comes from how long it takes to charge/discharge a capacitor to a specific value. It's been years since I've worked with one though, so this is pure memory and speculation. I should also note that using similar circuits, you can measure voltage by using it as a voltage to frequency converter, then measuring the frequency. With the beautiful part being the final measurement circuitry can be optically isolated!

@Plumpkatt1 2 күн бұрын

Although my mind is mush watching this video I actually really understand it the way you explained it at the end. I just stumbled across the video and it seemed interesting especially the way you explain. I love seeing your real world example after your lecture because it lets me see it in action which I need to be able to get an understanding.

@paulpkae 2 күн бұрын

Glad it was helpful!

@anonamouse5917 2 күн бұрын

If only this could have been packed into a 5:55 video it would be platinum tier.

@paulpkae 2 күн бұрын

🤣

@spark_coder 15 күн бұрын

This is by far one of the best explanations for an electronic component that I've ever seen. Your intro burst my ears (I was wearing earphones) but it was totally worth it for how good this video was and how well I was able to understand what you were teaching. Thank you for this video ❤

@paulpkae 15 күн бұрын

Thanks. Yes a few people have mentioned the intro volume. I had tweaked by OBS settings prior to recording to try and improve the clarity and forgot to normalise my intro recording. Other than that, I'm glad you made your way through it and found it of use.

@joedfazio 4 күн бұрын

I designed circuits using 555 timers back in the late 80’s. Thanks for the memories! BTW the 556 is twice the fun 😊

@paulpkae 4 күн бұрын

Thanks, glad you enjoyed it.

@donkeymedic 15 күн бұрын

This is by far the best explanation of the 555. I struggled to understand it , but this made it clear.

@paulpkae 15 күн бұрын

Thanks for the comment, much appreciated.

@user-fed-yum 10 күн бұрын

I remember using the 555 on a game that I made, forty years ago, to win my school science competition. Amazing how long they (and me) have been around.

@GregOnSummit 12 күн бұрын

Man ... this is what I like. Easy to understand with a nice example on what you did. Subscribed 👍

@paulpkae 11 күн бұрын

Awesome, thank you!

@danobrien3601 7 сағат бұрын

In its time a very impressive chip ...used it many times ... these days a few lines of code in a PIC replaces the 555

@chaosopher23 3 күн бұрын

I just happened to be playing with one, so... TLC55x warning... it will only source 10 mA and sink 100 mA. The NE555's will handle the current. Therefore, I am very happy I spent the money on a roll of 50 MPSA18 transistors! They also have no trouble powering the current-guzzling 555.

@hankcohen3419 17 күн бұрын

Brilliant! It makes me admire the engineer who thought this up in the early days of digital electronics. Also confirms that all electronics is analog.

@paulpkae 17 күн бұрын

Thanks for the comment. Yes all electronics can be said to be analogue. A 1 or 0 is only a voltage threshold at the end of the day. Just to add, from my experience, everything also always boils down to Ohms law if you drill down enough.

@thb40 7 күн бұрын

excellent explanation of how the 555 works.

@paulpkae 7 күн бұрын

Thanks! 👍

@stevecann3394 2 күн бұрын

Best 555 explanation ever 👍😀

@paulpkae Күн бұрын

Glad you liked it. Thanks for the comment.

@dennisbuns 15 күн бұрын

Enjoyed the whole video. I had learned about 555 before but this is much clearer and easier to remember. Keep doing this please. Cheers.

@int2str 19 күн бұрын

Wonderful video - thank you! Best explanation of a 555 I've ever seen. Really helpful!

@paulpkae 19 күн бұрын

Thanks, much appreciated.

@MrCapacitator 16 күн бұрын

Best 555 explanation I've seen 👍

@paulpkae 16 күн бұрын

Wow, thanks! Make sure you Subscribe, there will be more coming.

@CraigsWorkshop 9 күн бұрын

Thanks for making this video! I had 3/4 of an idea how these chips worked, but now it's crystal clear. You are a great teacher. I hope you keep making these vids. Cheers!

@paulpkae 9 күн бұрын

Thanks for watching and the comment, glad you found it useful. Yes more videos are coming, so make sure you Subscribe too 😁

@connecticutaggie 8 күн бұрын

Nice explanation of how a 555 works.

@paulpkae 8 күн бұрын

Thanks for the comment.

@mazeppa8818 13 күн бұрын

Thank you for this educational video! Really like the idea of colour-coding the voltage values!

@paulpkae 13 күн бұрын

Thanks. Yes colour code t represent the voltage (or potential) I think helps a lot. Pleased you found it useful.

@SusanAmberBruce 20 күн бұрын

You put a lot of effort into this video, thanks, I hope you are not discouraged by the lack of interest

@paulpkae 19 күн бұрын

Thanks. It was indeed a lot of effort. I just hope people enjoy the results. Thanks again for your comments, much appreciated.

@tedbastwock3810 19 күн бұрын

Lack of interest? You commented 3 hours after it was published. Give it time, Im sure this vid will get a lot of views .. or at least it should, considering how good it is.

@esra_erimez 18 күн бұрын

@@tedbastwock3810 I could not have said it better myself. This is by far the best explanation. I think this video will go viral

@jensschroder8214 18 күн бұрын

On the NE555, the reset input always overwrites the set input. On the B555, the set input overwrites the reset input. The replica wasn't quite perfect. This only happens when pin 2 is low and pin 6 is high at the same time. So comparator 1 and 2 are high at the same time. But for most circuits it makes no difference, because pin 2 and 6 are mostly connected. Therefore both comparators are different or both low. With the B555 the /Q output of the flip-flop is not used but the Q output. That's why set is stronger than reset. Accordingly, the output driver is not inverting.

@arcticpilotshow4440 3 күн бұрын

Just discovered your channel and this is high quality educational videos, thank you.

@paulpkae 3 күн бұрын

Thankyou. Glad you like them!

@shokdj1 14 күн бұрын

Well explained. I can see why these things were so handy

@paulpkae 13 күн бұрын

Thanks for your comment.

@gregf9160 6 күн бұрын

My father, an electronics engineer said "PNP = Piss _in_ Pot (arrow points in) NPN = _No_ Piss in Pot (arrow points out)" when I was learning this stuff as a kid.

@paulpkae 5 күн бұрын

Brilliant! 😄

@tsbrownie 3 күн бұрын

Really excellent video and description. Thank you!

@paulpkae 3 күн бұрын

Thanks, glad you enjoyed.

@carloscalderon-p9i 3 күн бұрын

In a design of some printer i designed 30 years ago at least ,I used a 555 as a timer for close to 20 hours period .. It did worked ,The RC in the resistors was several megaohms ..So this was way much cheaper than using a micro for a timer ..

@paulpkae 3 күн бұрын

Brilliant!

@eitherrideordie Күн бұрын

Absolutely lovely video! I always wondered how it worked and the explation was so easy to follow. It was fun to follow along because it made me think in a way that me realise the timing answer before you reached it. Cheers!

@paulpkae Күн бұрын

Brilliant, thanks for the comment.

@mal2ksc 3 күн бұрын

I read the thumbnail in Arnold Schwarzenegger's voice, like the line "it's not a tumor". 🤣

@paulpkae 3 күн бұрын

You're not the first to say that. :)

@HeadCodeMonkey82 19 күн бұрын

Great explanation, you made it really clear and easy to understand

@paulpkae 19 күн бұрын

Thanks. Glad you enjoyed.

@heisen6376 15 күн бұрын

Liked and Recommended, I'll do whatever I can to see this channel grow. ✌

@paulpkae 15 күн бұрын

Thanks very much.

@planktonfun1 17 күн бұрын

I never had the tools to see this, pretty nice to know!

@msmeyersmd8 16 күн бұрын

For me, I get nostalgia remembering the late 1970s starting in college studying engineering physics that included using an analog computer (shoved in a corner storeroom) and some basic biomedical electric engineering design. Isolating the patient from any mains exposure. In the late 1990s, much to my wife's disbelief, I would study/stare at high fidelity analog amplifier circuit diagrams. From vintage tube amps to state-of-art solid state stereo amps. Following the various feedback circuits used to eliminate harmonic distortions. Why? I'm not sure. I had extra time on my hands and it was so relaxing. Just like watching this video. "555 timer" circuits used to be in the many electrical/electronic hobby magazines years ago. Magazines. Gone the way of phonographs, magnetic tape, CDs, laser discs, DVDs, etc. My 2003 Toyota had an electric motor extension for the radio antenna that was broken off in the car wash. It ran every time I turned the car on or off. I thought I could just pull the fuse. It was fused, all right. But on the same circuit as 10 other totally unrelated and multiple necessary things. Probably through some special IC or microprocessor? I couldn't find a "wiring diagram" on the internet and the dealer will not give me a copy. Actually, the dealer has no circuit diagram in the classic meaning of the words. Just broken up functional portions on their computers. I finally had to pull the power wire by accessing it through the wheel well above the tire. I miss the 20th Century. Keep the videos coming. I'm sure I'll enjoy them.

@paulpkae 16 күн бұрын

Thanks. Much of the old fashioned approach of trying to fix stuff yourself has sadly gone. But there is a new era of developers, building entirely new and exciting electronics devices out there. I'm convinced the emergence of low cost micro-controllers has fuelled a mass increase in young interest.

@JohnVance 16 күн бұрын

I finished Ben Eater's 8-bit CPU and wanted an even more in-depth explanation for the timer, and your video was fantastic. Also had no idea those jumpered resistor network boards existed!

@paulpkae 16 күн бұрын

Wow, that must have been a rewarding project to have completed. I have watched Ben's videos too and fascinated in seeing the building blocks of a computer assembled and running on breadboards.

@accidentalengineering 14 күн бұрын

"Might be a timer..." "IT'S NOT A TIMAH, NOT A TIMAH AT ALL!"

@GenericCat 14 күн бұрын

wow the 555 is a bit latch! I have it up on a breadboard with multimeter leads and some pull up resistor on the trigger pin so it defaults to 0 and was following along with the graphics. that's super cool :D

@paulpkae 14 күн бұрын

@@GenericCat brilliant, glad you enjoyed.

@Soloist1983 17 күн бұрын

Loved the video but I would have hired that Schwarzenegger voice impersonator from insta and had him say "It's not a timah" in the opening, a la Kindergarten Cop 😆😆

@robf9931 5 күн бұрын

Brilliant explanation.

@KonstantinDeak 6 күн бұрын

First video I've seen of yours and its great. Very clean, no blurry camera stuff, WELL explained, excellent format of diagrams and bench testing. Liked and Subscribed!

@paulpkae 6 күн бұрын

Awesome, thank you!

@YarGnawh 16 күн бұрын

instant subscribe. the best explanation video of the 555 ever.

@rowanlidbury 16 күн бұрын

Ditto

@paulpkae 16 күн бұрын

Great, thanks for Subscribing.

@paulpkae 16 күн бұрын

Brilliant! Thank you.

@grahamlewis6777 9 күн бұрын

Great video, thanks for all the effort you put in to create this with all the graphics too. Great work :)

@paulpkae 9 күн бұрын

Thanks for the comment, much appreciated.

@johnmaloney9368 13 сағат бұрын

very good instructional video Sir keep up the teaching

@paulpkae 11 сағат бұрын

Thank you, I will

@MellexLabs 13 күн бұрын

This was a fantastic video... the presentation is... chefs kiss 👌

@paulpkae 13 күн бұрын

Thanks, glad you liked it.

@oscargraveland 17 күн бұрын

Brilliant how the switching points are at 1/3 and 2/3 of the voltage range respectively, making the charge and discharge relatively linear. Imagine how inconsistent the timing would be if the switching points where near ground and VCC.

@paulpkae 17 күн бұрын

Yes, although the RC time constant remains the same throughout the charge/discharge phase, the shallower curve region as the charge approaches the +V or -V potentials, would probably cause some erratic behaviour.

@tincanpete 14 күн бұрын

Excellent explanation and diagrams, thank you!

@paulpkae 13 күн бұрын

Thanks.

@MKeuning01 16 күн бұрын

Absolutely wonderful explanation of the 555. Thank you.

@paulpkae 16 күн бұрын

Thanks. Glad you enjoyed.

@alphalunamare 11 күн бұрын

Not being snotty but I understood all of that. Having worked for many years with jobbing hardware engineers I'd be amazed if they had the intelectual capacity to have understood this. I am a Software Engineer unfortunately ;-)

@rogueninja1685 6 күн бұрын

Until this video, I always thought the timing mechanism was a constant somehow and explanations of the 555 never pointed out the required external components to make it work. Capacitance and resistance was all it ever was and now I feel like I have a good handle on the whole thing. It's amazing how many blanks this single video filled in, particularly the noise capacitor

@paulpkae 5 күн бұрын

Great! Glad this video has helped fill in the gaps.

@subtlethingsinlife 14 күн бұрын

Without doubt the best explanation

@paulpkae 13 күн бұрын

Thanks so much, glad you liked it.

@sky173 7 күн бұрын

Great video. I've been using them since the early 80's It's hard to believe it's been around for so long. Thanks for sharing. PS> might want to reduce that intro volume a tad.

@paulpkae 5 күн бұрын

Thanks for watching!

@MartynDavies 16 күн бұрын

@1:25 Hans Camenzind, the chip's designer, said that it wasn't named for the resistors, and that a marketing manager called Art Fury had named it. I read that in one of the IEEE magazines when I was researching the chip a while back.

@paulpkae 15 күн бұрын

Yes I recall something like that being said. Too coincidental to me though. 😁