Learn to use the 555 timer

The 555 timer is the most widely produced IC on Earth. It is incredibly useful and has a few modes of operation. In this video we look at two of them: Mono-stable (single-shot), and Astable (flip-flop).
We look at what the pins are and how to connect them to resistors, capacitors and buttons to make the two types of circuits, and then put both to use driving a Ti CD4017 decade counter to light a row of sequential LEDS.
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May I suggest: "10 PCB's for two bucks!"
• 10 PCB's for two bucks!
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[@kylesoule]

I've spent a week searching out a 555 explanation that made sense to me. This was what I was looking for all along. Great channel, great content, love your style!

[@learnelectronics]

Awesome, thank you!

[@Holmnielsen-]

love the laid back attitude :)

[@idhamhafidz]

Finally a good video explaining the 555 timer

[@johnnygault365]

Loving this channel Video format is very organic Like getting a personal lesson

[@Retox5]

Thank you!! I have been trying to build my first 555 timer circuit, and couldn't get it to work, until I hit your video! MY LIGHT DAS BLINKEN!! GOOT YA! hahaha!! And THANK YOU for explaining that I can change the capacitor to change the PWM signal! I'm getting smarter, thank you! :)

[@learnelectronics]

Glad to have helped

[@judo-rob5197]

Thanks again for your efforts. Cleared up difference between the two modes.

[@Rockdagger]

hahaha im old enough to remember that show, nice reference man lavern and shirley

[@bendaniel2271]

1:09 reminds me of Wayne's World. I'm from the UK so never understood the original reference when I watched it as a kid. Thanks for the nostalgia

[@markrhine5809]

Great video, I like when you said broken leg on the chip.. nice opening to great video....

[@user-lm6er2vu7s]

I don't know how can i thank you. U help me so much in my studing. Thank you so much 🌹🌹

[@opalprestonshirley1700]

Very nice presentation. It's a great little chip.

[@LuizDahoraavida]

This is the best video I've seen so far on the 555

[@perfectpete1]

You get a thumbs up just for the song. Everything else was cool too, Thanks for the rundown.

[@MultitrackCassetteFans]

Thanks for posting this, very useful

[@learnelectronics]

Welcome

[@Venomator.]

I love it when your some of your awesome back issues turn up in my ‘Recommended’ stream Paul! This is great for me and one I will try and figure out, as I have a few spare 555s now... 🤪 👍🏻 🐍

[@ChrisAthanas]

Such great content and an amazing teacher

[@kristelchelseago5755]

Thank you!

[@JohnStraussmusic]

great video. thanks

[@learnelectronics]

Thanks I have about 5 ne555 videos. It's my favorite ic to play with.

[@_micro_world]

thank u paul

[@alanparadise3139]

Love it

[@JoaquinSanchez-db9gk]

You're awesome

[@heckyes]

Neat channel! Subbed.

[@learnelectronics]

Thank you!

[@drfat0101]

enticed2zeitgeist agree.. underrated. Sure will will pick up on subs

[@josedominguez2021]

I like of course!!!!

[@radostar7139]

Hope useful for my traffic lights studying

[@BADALICE]

Right on. I should have learned this first before I started trying to play with these. I have this 555 memorized now. Shoot I can make my own projects instead of trying to figure out what went wrong. If I had watched this. It would never have taken me as long to figure out some of my 555s were bad out of the box. Thank you. Or are they bad? I have not used the reset. Hmmm? Now I'm wondering.

[@DrHWO]

Thanks Paul, really useful again! I have a particular problem - trying to power my WSPR transmitter over a 2-3 day period with a modern USB power bank . Problem is my supply keeps switching off. I'm assuming that if the power bank doesn't detect a certain level of current draw, it switches off the supply to the USB port. In my case after 30 seconds. Is there a possible use here for the 555 to switch on a load drawing say 50mA, every 15-20 seconds?

[@manojithalder7448]

Nice

[@ianburkard]

Every demonstration that I see today utilizes LEDs. I'm trying to build a multivibrator for small 1.5-3v incandescent bulbs (powered with 3v-9v batteries) to restore some old toys that require vintage bulbs. It seems that incandescent bulbs have far more resistance than LEDs. I made the mistake of purchasing some prefab multivibrator PCBs for LEDs (because I have no knowledge about this realm). The setup was rated to handle 3-15v, so I thought that this would be great for powering my micro 3v lights. The default PCB setup wasn't powering my incandescent bulbs. I was told to remove/skip the resistors leading up to the diodes, and wire directly to the incandescent bulbs. This hack works, but this hack is not really the solution that I want, and it's overloading the components (transistors are quite hot and eventually failed). I'd much rather know how to select components that are correct for the job, instead of banking on the supposed workable range of a default product. Is there an easy way to check the resistance of a bulb (if heat from a bulb can cause varied resistance)? How do I build a reliable circuit that will power them? Someone suggested that I use a 555 timer instead of trying to balance a mutlivibrator. :/ And as far as a 555 goes, I have no idea how items should flow through the chip.

[@lazoman462]

Thank you for this great video. Now I know a little bit more about 555 timer. Can you just tell me in the astable mode, what resistors did you connect to pin 6 and 7 as voltage divider? Thank you.

[@learnelectronics]

I made this video almost 3 years ago. I honestly don't remember. Try putting a potentiometer between 6,7,8. Thats what I do now.

[@Tegatreides]

first of all, thank you for all your videos. even if sometimes my level is too low for what you say, i learn little by little. thank you. u mention that the ne555 kind of debounces the button. i liked that because i need a hardware debouncer for a non arduino project (already watched you software debouncer video amd it was primo). would you let us know how to use the ne555 as a simple button debouncer. thank you

[@learnelectronics]

Look for my video on 555 as a schmidt trigger

[@Tegatreides]

@@learnelectronics roger that

[@francomongillo]

Hello and congratulations for the truly extraordinary video, I wanted to ask you, is it possible to have all 5 LEDs light up at the end of the sequence? and then starts all over again. Hi, I always follow you, you're very good.

[@sweetleaf7751]

Sounded like Laverne and Shirley for a moment there the tune You hum,by the way i have several of them jumper pins that have snapped off on the ends, or am I stuck with cheap ones?

[@ArthurIslamRU]

Thanks a lot. Where I will can see your schematics?

[@tonygalloway3704]

Hello, I'm going to start learning electronics. What is that board called? Just a plastic pcb board? What size wire would I need to get? Can you point me in the right direction please. Your videos are really inspiring I would love to learn more.

[@ChrisAthanas]

Look at amazon for electronics, tie Point Experiment Mini Breadboard

[@ChrisAthanas]

Usually 22 gauge wire

[@surenbono6063]

..I am wondering if the red LED were all connected in series instead...and the runny led are lit by variable timing of + & - ..is that possible?

[@mu8502]

hey my friend I need to make a square signal that have not any small changes in frequency or pulse width but ics like 555 timer can not be like that and have small changes is there any way???

[@yummyklown9226]

Laverne and Shirley! lol Time to drink a glass of Pepsi and Milk.... my age is showing.

[@mykedoes4099]

is there a 555 timer with two output pins and can you make one output pin low when the other one is high and have the two output pins alternate at desired frequency with var resistor? and cap ? , i need it to trigger two transistors ?

[@takix2007]

Maybe use a PNP and a NPN transistor, both bases connected to pin 3 of the 555. Then, when pin 3 is high, NPN is "on", PNP is "off", and vice-versa ?

[@mykedoes4099]

@@takix2007 i like that idea , i have seen some circuits like that..

[@devilsatan2973]

Just use the 556. It's a dual timer.

[@mykedoes4099]

@@devilsatan2973 i had no idea there was 556, i know of 555

[@devilsatan2973]

@@mykedoes4099 Yep. It's 2 555s on 1 chip! Not sure if I still have one or not. Had gotten one some time ago. But don't know where it went now! (got a big junk box)

[@jopo4851]

please please tell me what microphone you are using. if its integrated into a webcamera or camera please tell me which webcam/camera it is

[@jj74qformerlyjailbreak3]

There are some weird Characteristics with the triple five. That’s it I’m going to break down and find an DSO

[@christiannielsen3863]

What should I do if I want the 555 timer/decade counter to make a pulse only 8 times? I want a relay to pull 8 times every 2 hours og 4 times every 1 hour.

[@learnelectronics]

Connect 9th output to reset

[@christiannielsen3863]

@@learnelectronics thank you! you are the best. what do one do if its 20 times og 57 times?

[@takix2007]

@@christiannielsen3863 use more than one decade counter and connect the N+1th pin to the reset pins?

[@robertwalton9305]

like it1

[@leebannister3759]

Is there a schematic diagram for this circuit?

[@Raghhaadd]

I have a project and I want to know the names of the tools that I used, can you write them?

[@ninovitaliano7943]

That cap that hes using in the astable section looks to be 100 micro faras

[@ninovitaliano7943]

Edit: farats*

[@maxprophet2401]

edit farts: farads

[@wildanmni164]

Can u make Tachometer shift light for motorbike with ne555? Please share me

[@learnelectronics]

Sorry, no

[@harshitsrivastava5559]

Sir how that happened???😂😂😂when you accidentally lifted up that jumper wire.....

[@kenwathen6258]

Looking for a kiss circuit for a knight rider 10 leds

[@learnelectronics]

I've done at least 3

[@addepartment]

Laverne and Shirley lol

[@tomference4618]

..did not really understand what makes a 555 work, or why.

[@johnf3326]

The question has been .... what is God? Where is God? Well .... God is the 555 timer, all things to all men and omnipresent

[@scottbaxter2061]

Xhosa is

[@drfat0101]

When you edit the videos after recording, could you also try to shorten them a bit?.. perhaps take away the silences, drawing on paper, focus issues, putting things in & out of the breadboard.. etc

[@learnelectronics]

FT I'll see what I can do to make them shorter. don't miss tomorrow's video... giveaway announcement. and thanks for taking the time to comment

[@jcr723]

Hi. Thanks for the prolific rate of content creation! I've subbed. I have to agree with FT...the pace is such that 1.25x and even 1.5x is needed often. I don't want to be negative. Just a suggestion for continuous improvement. But please don't go so far as Great Scott! in terms of pace. I'm a sub of his and like the channel but need to pause constantly...he just goes too fast! I guess the middle way is desired by your viewers. Easier said than done, I know. Whatever the case, thanks for your making these vid's! I share your channel verbally with my students (I'm a teacher).

[@learnelectronics]

jcr723 thanks for commenting. if you look at the later videos, I've shortened things a bit. but I'm not an editor lol. I appreciate your support, I'm a teacher as well.

[@ali.kh57]

چوس

[@peatmoss4415]

All those loopy jumpers make this look SO crappy.

[@learnelectronics]

And now I am sad

[@fannyagbayani]

why u the heavy breathing?

[@learnelectronics]

www.medicinenet.com/congestive_heart_failure_chf_overview/article.htm

[@fannyagbayani]

oh im sorry for that, ddnt mean it the bad way thanks for the video though, keep it up

[@wugone3411]

Drink more water sir. Your sound like very tired