The most simple way to set up a 555 timer
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- เผยแพร่เมื่อ 7 ก.พ. 2025
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Schematics are great. They are a universal standardized way to give a graphical representation of a circuit. But they can be difficult to translate to putting components down on a breadboard.
In this video we look at a simple 555 astable circuit. The schematic shows the connections, but doesn't really tell you how to lay it out. We set up this circuit in the simplest way possible, using only 1 capacitor, one potentiometer, and a few jumper wires.
LOL, You just made the 555 a pile more friendly to me .. Thank You.
Welcome!
Am sure the 555 was out in early 70s...
I guess it's quite randomly asking but do anybody know a good website to stream new tv shows online ?
@@martineric6894 Filmlicious
Watched 2 or 3 videos before and didn't underatand a single crap about the IC. But this one video here, really hit the nail. You did a great job at explaining how to wire it, thanks a lot man.
Thanks
Now seriously, I think I had my share of teachers throughout my rather short life. 33yrs, pilot. But you Sir, your calm, your voice, the sense of such a nice person that I got from you, the knowledge you share... I could just seat on a table right next to you for an entire day!!! Only with a notebook taking notes. Just something about you. Thank you!!!
I love the videos please keep them coming. I have more electronic components in my garage than the law should allow. Somethings are hard to understand but you just simplified my life thank you, you are a good teacher.
I watched this a few weeks back. Today, I did my first breadboarding since then. I applied these principles and it went so much easier than some of my previous attempts. Thanks for the teaching the things that others assume to be known.
I have a favorite 50% duty cycle 555 circuit with just two parts parts! It will ALWAYS oscillate at 50% D.C. and it has 100% INDEPENDENTLY adjustable frequency and amplitude.
From the standard monostable, pull out the resistor at pin 7 and the cap at pin 5 and toss 'em! Now connect pins 2 and 6 to output pin 3!
* ONE POT
* ONE CAP
Adjust the frequency with the pot and the amplitude with Vcc
BTW: the formula for the frequency is given as: 1/1.39RC
ps
The 1.39 comes from 2Ln(2)
THANKS FOR THE GREAT VIDEO!!!
Sorry, I meant "ASTABLE"
The best 555 explanation ever.
Thanks Paul really enjoying your videos. They make electronics much clearer than 28 years ago when I was an engineering student.
This is the best channel for learning electronics, Paul is such a cool guy
There should be a 555 fan club. Everyone loves it.
I agree
we need group chat that's the best way to learn more things share knowledge thanks❤
Umm, there is a club... Not only that, but there is also a career ...
‘Keep it Simple Stupid’ has to be one of the most brilliant pieces of advice that every educator, professional engineer, technologist, designer, and hobbyist should always follow in all of their endeavours. A genius makes simple work out of complex problems, and idiot tries to make everything as complex as possible in order to try to look as smart as possible.
The simplest example of the 555 I could find on the internet. Thanks!
Very nicely done! I'm sure the other way with extra components exists for a reason, but this will help people get into timer circuits more easily when they are just starting out.
It's amazing how after 40+ years the 555 is STILL such a versatile IC
It's over 50 years now as of 2021
@@cpt-cptCaptain yeah I wasn't sure off the top of my head exactly how long, but I knew it was at least older than me 😂
Electronic components, not to mention the theory and formulas centuries old have hold up remarkably well.
Thank you very much for your video. I do need the KISS method, and have to learn 555 today. After viewing your presentation I will assemble an air pump. Thank you again. Stay safe and be well.
SORRY I AM FRENCH. SO MY ENGLISH...... POOR. IT IS THE BEST DEMO I NEVER SEEN ABOUT 555. THANK YOU.
hi Paul, i`m Steve and a total newbie to electronics, i know about some of the components, love watching your vids, funny in a good way sometimes but very very helpful, well done please keep going, thank you..
Dear Sir, Great video, I am a student of electronics and your videos are easy to understand and the circuits are very interesting to watch, Keep up the good work, and have a pleasent day.....
Thank you
Thank you so much for this video! I've been trying to figure out how to build something like this for a while and I had no idea it could be so simple and inexpensive!
You have a wonderful way of explaining the circuits and principles. Thanks for sharing your knowledge!
This was great. I was experimenting with a version from my old Radio Shack Engineer's Handbook, by Forest Mimms, and not getting favorable results. I have used the "academic" version, but I was amazed to be able to build this minimalist version, and get precise control over the frequency. With R1 & R2 , being equal I have control over the duty cycle aswell. I also liked the reference to Steve Woznicak. Job's often gets so much of the credit for Apples success, but Woz was the Engineer.
Woz is the man.
@@learnelectronics I really enjoy your presentations. I am in my final year as a student of electrical engineering, and your videos help me to get back to in tune with why I chose this path. The passion for experimentation.
Great job!
I like it: a just barely good enough circuit. I'm working with these pesky little 555's in my Electronics 101 course, and practical tips are priceless.
What I did on my bboard is to wire both rails with Vcc.
In your example, I would've then, instead of routing a 2cm wire OVER the chip between pins 4 and 8, instead use a tiny jumper from the hot rail to pin 4.
I love your videos man. I was having so much trouble actually getting output from the 555 before this.
Thank you for a brilliant channel, both old and new videos are just great. The '7Ps' and the "keep it simple stupid" were just fantastic. Thanks again.
Very welcome
I enjoyed it and learned something USEFUL!! Minimal bits to do the job. Gratitude!
"This is good, it's academic, it's to much". Got me tuned in ❤
That circuit is a bloody ripper, so neat and simple, big help for beginners. Good job on practical demo,, thank you Paul. Great video.
Thanks - that is what I needed- just a simple explanation, not some MIT bint going off on comparators and shite that go beyond me!
Absolutely brilliant, simple and practical explanation mate. Thanks heaps!
i like how you executed the video, but there is a but, i am going to be making a 555 circuit soon for the first time and im going to use 2 resistors. sadly because i never made this circuit before, and because you used the adjustable resistor in place of r1 and r2, i still dont know how to make the circuit. it kinda sucks cause other than that you would of helped me learn how to build the circuit. thanks for the upload, i still gave a thumbs up.
This video has 555 likes, it should have 555 coments. I really like this tutorial, it helps me building this circuit every time. Thanks!
Dear Mr. learn, the first minute and twenty two seconds were all I needed to subscribe. Tired of wasting time sifting through un-endless blogs of scientific tech gurus and their teachers condescending people trying to self teach . Most usually end up telling you just how impossible the task is and that rummaging through 15- 20 year old electronic trash for pieces is pointless and a waist of time, and the best way is just to go drop 30 to 50 dollars at a store.
Only thing worse is gamers getting all bent out of shape when someone asks a question that reveals they have a pirated version, so they get all huffy about it since they spent 40 bucks on a 8 year old game.
Tip: put the speed of the video on 1.25X if you are in a hurry. Good video thx👍🏻
The first chip I ever used while I was still an apprentice (late 70's)! Like me still going strong(ish)!
+gartmorn nice!
Tried various circuits. This was the first one to work!
Very cool video with the 555 basics!
Great video. My oscilloscope should be delivered today. Thanks for sharing. Everything about electronics is so fascinating to learn. Thank you much for sharing your knowledge. Artie 😊😊😊
Great video, you just made it easy and fun to set up my very first 555 timer. THANKS A TON!!!!
Man, I love the 7-Ps... may start implementing that at work.
Feel free
Привет порой не знаю как быть етих ответ
Thou art a clever buggart!
But who are the 40+ could not's who thumbs down?! 🙄
It's as simple as the flip flop I made to drive two different color LEDS through 2 different clear tubes to simulate a pulse for a kid's haloween mask made from a discarded face respirator. He got props for that. 9V battery tucked inside the respirator. Studs from leather collars, light chain and black paint = happy kid!
Would everyone stop complaining about cheap chinese products? Buy expensive American products if you are not happy with them. All of it is made in China anyway. Just some companies slap their brand name on it and pretend it to be superior. It is made in the same Chinese factory as that “cheap crap”.
Theres still a significant change in quilty that's relative to the price. a $5 breadboard will have lose and tight pins, and paint wiping off, while a $10-20 one would be significantly better.
Nice, but, how can I adjust de frecuency with a pot?
For the 555, the Cap/resistor combination changes the frequency of the trigger. So increasing and decreasing the pot resistance changes the trigger. The math is cap * resistance = interval. It is laid out better in the datasheet for the 555. Not all resistance is futile!
Excellent 555 lesson. Thank you for sharing.
So simple I got it to work on the first try thax man!
im new in electronics but if i whant put pwm from Arduino vcc i can adjustment my frequency ???? many thanks u r best !
Great tutorial and ingenious breadboard layout
Great video! I have been wondering for along time how the Triple nickel works. thanks!
I though frequency is f= 1.44/(R1+2R2)C1. Is there a reason the 2 was left out or am I wrong
You are not wrong. Thanks for pointing it out.
Love these simple circuits. Great for learners like me
Brilliant. You just answered my question 🙂
I am building a 100ns PWM and the Arduino isn’t fast enough.
Arduino can only reach 65.1ns
I am teaching myself how to build a pulse laser driver to run a 75w 905nm diode.
I am using the LM317 as a current regulator and now I can reach the 100ns max pulse rate to charge the diode. I can’t afford a $2000 driver so to build one for $50 is very good.
If my calculations are right :
R=2.18ohms
I=5.85A
V=12.8
P=75W
With a pulse duration of 100ns max.
Duty cycle is .01% which I have yet to think about.
Thanks again.
I can not express how useful this video was for me. The astable schematic from the 555 datasheet/appnote makes it look super daunting. Can you do a video on how to build circuits from schematics? I've not seen a really good video on how to turn a schematic into a real circuit on either breadboard or perfboard (not PCB)
wouldnt it be possible for the potentiometer to have a voltage greater than 1/3 VCC which means it wont set the flip-flop?
Not quite sure what I’m looking at…BUT I LIKE IT!!!
you are the best mate thank you.
you put much love for what you are doing and thats great
Nice and simple, but be careful not to turn pot all the way so as to short pin 7 with vcc. Discharge transistor wouldnt like that. Standard Astable set up always has resistor no smaller than 1K between pin 7 and VCC.
If I wanted to have a 30 second delay, what size resistor would I put in there? Or something close to it.
Nice video! Thanks for teaching
Very straight forward - thanks
I love this guy! Amazing video
I can't believe some people actually gave you a thumbs down. The nerve of some people! But don't let stupid people get you down, thanks for your videos.
Unbelievably thankful for you.
Good God. I'm glad it's simplified. But I can't for the life of me figure out these things. I'm trying to build a simple circuit, so I thought...i want an LED to blink for a set amount of time, after a photo resistor sees light. Lol, sounds easy enough. Totally isn't seeming to be.
Keep practicing, it does get easier - I promise!
@@dandoo111 yep...i got it!
I think it was a day ago I laughed at the “Kiss” 😂 I think I’ll make the nooner tomorrow
Hi, I have made a monostable multivibrator using 555NE timer ic. What observing is it is getting triggered automatically when some electrical appliances are being switched on or off in the house. So is the 555NE prone to pickup noise or problem is something else. Can you think about it plz if you get time.
In last minute of video you mentioned number 82. What do you mean by that?
Great presentation but for the guy who first heard of a 555 circuit 8minutes ago please explain what this is and why it exists
Try looking up ben eater's video on the stable or astable 555 timers. He actually walks through the chip logic and explains the triggers and cap/resister maffs. Simply search monostable or astable.
It's a timer with 3 different behaviors. Single shot, bistable, and astable. It can be adapted to be a clock, a switch, a timer, an audio source, etc..
Perfect...exactly what i was looking for. Thanks for sharing!
Your stuff is Still good! (Noticed a lot of comments have aged) Thanks!
Simplest connection is resistor from output pin to capacitor on pin 2
4-8, 6-2...as I recall...
Excellent video. My question is if it is easy to make a circuit that automatically compensates for voltage drop. Say you have a capacitor charged to 7 volts and your target output voltage is 5 volts. When the capacitor discharges, the voltage drops - is it possible to keep a steady voltage from 7 volts to 5 volts at the output? The output being constant 5 volts. The circuit would have to adjust the duty cycle in relation with the capacitor voltage.
Without getting too deep into it, a big (2200 or 4700mA) cap parallel to the output would keep your voltage steady.
Thank you i understanded the fundamental of this, i have been able to make a buzzer with it.
Hi there, a newbie question: Is it possible to use this chip to turn a single LED on for 9 hours, then off for 15 hours then repeat the process?
Sure, you could make a 555 timer that, but an Arduino would be much easier. What is the context?
@@learnelectronics I have a very small enclosure and only a 4,5v battery.
Arduino Nano!
@@learnelectronics Ok, here’s the irl problem: cheap automatic Chinese chicken coup door that open and closes due to sunlight = irregular intervals. If cloudy it’s a no go. Solution: use a white LED and set on/off times to simulate the sun. I’ve tried it with a Nano and a RTC hooked up to a computer and it works fine, but I don’t want to drain the three AA batteries using a Nano and the RTC.
Hmm ok lemme think on it
what is capacitance of the capacitor?
100nf worked for me although 10nf would work too
The formula is actually F = 1.44 / (R1 + 2R2) C..
I would love to see a book with everything it can be used for.
Is this possible with regular resistors? What value would I need and where do I connect them?
Use the frequency formula to determine what resistors to use depending on your preferred output. Put them in place of the potentiometer, with one lead of each resistor on the pin connected to the pin in place of the wiper. If you want to see a drawing of your circuit, look at the schematic at the beginning of the video that he seems the find so complex and confusing. He did exactly what was on the schematic except he eliminated the output indicator led portion. Other than that, he replaced the two timing resistors with the potentiometer and wants gullible people to think that he's a genius.
nice explanation. Thank you for making the vid and sharing.
i still dont quite understand what was the purpose of the pontentiometer? Was it just to acts as a resistor?
It acts as two resistors
Very nice detail video. Thanks for sharing.
Loved the video man! Just wondering where to connect the output (say a motor or led) to the breadboard??
Pin 3
@@learnelectronics Thanks, I should have realised that from the video🤦😂
I'm sure Woz approves! :-)
Great thanks for the simplification! Is there such a thing as a variable capacitor? Then u can adj freq and duty cycle.
+Michael Padovani Yes there are variable caps, used in tuning radios
duckduckgo.com/?q=trimmer+capacitor&iar=images&iax=images&ia=images
They is touchy though esp. in RF so use a ceramic screwdriver to deal with them.
If they worked fine without, then that is good.
duckduckgo.com/?q=ceramic+screwdriver&iax=images&ia=images
Michael Padovani i think you must watch this too if you like this circuit
th-cam.com/video/caUHiHzswBU/w-d-xo.html
What IDE do you use. Like I have said before I’m new to this so I’m trying to get correct info and direction from individuals like you and your group for guidance. Anything you can recommend is greatly appreciated. Thanks again your videos are excellent. Artie 😊😊😊
IDE, I just use the latest from Arduino
learnelectronics thank you for getting back to me so promptly much appreciated. 😊😊😊.
Thank you for sharing ic 555 application
Yoooooo man big thank you . Been wrecking my brain for a few days as to how to use 555 timer in a PWM for a 5v motor . Any suggestions on cap size and to add in a mosfet to protect the 555 timer. ?
What would of been nice is to see a schematic of the interior of the 555 to know how it works and why you wire it that way. Trigger, reset, out, controll voltage, threshold, discharg ?
Search Google?
This is the best one I found
Bro... you make it so easy for me... Love your technic... kiss !!! ahahah Keep making good video !!
Cool I'm wondering if you can still put 15 volts through it
Use a transistor or mosfet.
So then what is all the other "extra" stuff doing then? Why do I want that stuff too?
The only EXTRA is the cap on pin. Everything else has just been rearraigned and streamlines.
i want to use the 555 as a soft start and stop for car amplifiers that pop the speakers on shut off. any advice? thanks
Sorry, audio is not my specialty
Hey Tom did u ever figure out how to wire this with your amps to get a soft start turn on? I’ve been trying to figure this out also thanks….
@@djrockon5729 I used something called an RC snubber circuit in parallel with the relay contacts.
What are the resistances of all of the resistors? I couldn't get mine to work :(
What is the power supply volts?
You should watch the video. Everything you asked is in it.
Thanks for sharing your work !
good stuff. hope you're doing well.
Yes it's just required for everyone, i want to learn such simple placement of components to create DIY PCB boards, can you simplify with PCB making process of eighter Eagle or Fusion 360 so that i can gain more indepth knowledge to arrange components on PCB Board before making order i wanted to create it hot iron and eaching at home ...
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???
....can I use it to produce high voltage connecting the primary of the trasformer to the out pout?????.....
likely so, however i would recommend using transistors connected to an hv power supply
Very helpful video, thank you!
Great video of how to make an Astable circuit. Can you do this for the Monostable circuit too? I would like to build a timer which cuts off power after a few seconds after a button has been pushed to save some energy for long time dash buttons built out of ESP8266 or ESP8285 and not using the sleep mode.
Just found it in one of your videos th-cam.com/video/1wHNaVPn2hw/w-d-xo.html :)
+c0r0y I did I video on this.
man, I don't get it...I've put together way more complicated circuits, but failed to build this 3 times. Found your video, followed along. bingo bango. thanks for your assistance.