How to control the duty cycle of the 555 timer
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- เผยแพร่เมื่อ 28 พ.ค. 2024
- How to control the duty cycle of the 555 timer
HEY YOU ABOUT TO POST SOMETHING STUPID:
Yes, I know my hands are large/fat. It's because of a heart condition I suffer from called Congestive Heart Failure. Here's a link to some information about CHF: cle.clinic/2TdS2Ux
One of the symptoms is that is causes fluid retention, mostly in the hands, feet/ankles, and face.
It will kill me one day. I'm doing ok right now, but someday...
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Just last night, I made my first astable multivibrator with a 555 timer. I was wondering how to adjust the duty cycle, and then you posted this! Quality content as always.
555 for president. 😀 More uses than a Swiss army knife and safer to play with. Thanks for the video, now get some rest!
I’ve used this exact circuit as a motor speed control for testing DC motors. It works great if you want a easy speed control without have to code an Arduino.
Great video Paul, I love these analog circuits.
I'm an analog guy at my core. I enjoy playing Arduino, but I'd rather build something from discreet components.
Neat idea!
really enjoy your videos, keep it up, thanks for the effort you put into making them enjoyable and informative
p.s. I am sorry to hear of your health condition, I have lost several people in my family to heart disease, but, know that you will be in good company when it's time.
Hi, Paul. Thanks for this. I am building several starship models and the pre-made circuits are beyond my price range. I am glad I came across your channel. This is one that I was looking for as far as flash rate/duration. What I am looking for now is a circuit that will "breathe" 2 or 3 LEDs at different timings, in order to get a "lava" effect, like a really slow chaser that fades instead of pops on/off. I can possibly do it with 2 or 3 555 timers, but if there is a more compact way of achieving this, I would love it. Keep up the great and easily understandable tutorials/lessons.
Thank you Paul
This appears to be what 1000s of us need for spot welding: a sub-second on time and 2-3 seconds off time. Will build. Thx mucho!
Ed c
All I have are surface mount timers. Ive Made traces with copper tape. I had to create a custom footprint sticker lol. It’s fun to do just takes a steady hand. Got to work with what god gave me and it never fails to keep me occupied.
Great analysis Paul.
Just bought some 555 and 4017 to build a step sequencer and this tutorial really gave me some ideas to play around with my plan ;P
Really nice, man! Thanks a lot for another lesson! 😊
Hi. I found this tutorial to be quite informative. I would like to know the configuration of the pot and resistor combo. The parts list does not seem to match the breadboard circuit as shown. I can use this type of circuit in a project I am making for a PC interface. I need a pulse generator that has long duration to medium duration. I have one cobbled up, but it is running as a square wave, and I would like to shorten the duty cycle so I get a short positive going pulse.
Thanks for the video. It got me back on track.
Great job Paul! Who doesn't like a 555 video?!
If you could zoom in on the diagrams or provide a link it would be great as sometimes hard to see all details on a phone screen.
Keep up the great work educating us amateurs in your steady, easy to understand way 👍
One thing that some may have missed is the little stake headers that you have for your power rail connections. What an excellent idea! I am always rigging up clip leads and wires to make connections to the outside world. I have a lot of those styles of connectors on scrap motherboards and PC cards from the past.I will be actively harvesting them now. It's the little things that make bread boarding more easy to do. And if it's easier, then you are going to try more projects! You could also use 2 pins stake headers to solder small parts to in order to make them easier to insert into the breadboard.
Yes, thats a good idea. Thanks for sharing.
thanks for sharing
I like these 555 videos,
Just found your channel after making a digital clock out of spare parts using a 555 for the timing! Its not very accurate. :( But this circuit might just help! Cheers. Keep up the good work!
Thank you.
Thank you very much
Hi Paul I'm curious about your thoughts on neat breadboarding. Recently I've been trying to be super neat about it and keep all my wires in a single plane (no looping over others) to avoid interference and keep it easy to debug. How important do you think this is? How neat would you expect an average breadboard in industry to be?
I spent 30 years as an engineer. Here's what I can tell you from my experience at my place of work. Your breadboard is an extension of your mind and personality. You use it to flesh out your thoughts and ideas before you perfboard them.
I've seen completely anal engineers without a crumb on their bench and every wire straight. I've seen engineers who haven't seen the top of their bench since their first day. Their breadboard look like a bird's nest.
So which type of engineer does best? Both. Industry is results driven. Management rarely wonders in to engineering spaces. You are more likely to be called to their floor for a presentation, and you wouldnt take a breadboard to that.
I would say be as neat as you can without putting too much thought into it. You will develop your own style.
@@learnelectronics Awesome response, thank you.
I don't understand what the add extra diodes are really doing to the RRC time constant or the charge/discharge cycles, can you explain more in detail about what its doing?
nice content i learn more and significant idea from your content .love from bangladesh.
Thank you :)
Hi ,i am having a problem when changing the duty cycle. as i increase it, the peak to peak voltage also changes. Why is that and how do i a make it stable?
Thanks for the content, really helpful
This is a timely post for me. I just ordered some 555 timers to try to build a PWM controller for an LED light strip. If you decide to do a follow-up post, I’d like to see a design that uses a single potentiometer to adjust a PWM duty cycle while maintaining a constant frequency. And would you know a good frequency to use that minimizes the effect of flicker?
By the way, I look forward to your explanations. I especially like that you include schematics (not just breadboard wiring) and that you draw them with the Positive at the top and negative on the bottom with a logical flow from top to bottom and left to right. That greatly helps me understand what you are explaining.
Thanks Tom. Anything over 30Hz is generally not detectable by the human eye. Do it like an engineer and add 20% to that and you get 36Hz. Check out this video: th-cam.com/video/VurDwrtTF3g/w-d-xo.html
Adjusting a pot to control the duty cycle is a great idea! If only i could use a 555 to control my doody cycle..... my doody cycle is not as regular as it was when I was younger.
I too love your 555 videos. I didnt quite get this though but im sure its my green'ity. Can you use a 555 timer for running a program? (like the washing wachine do etc)
Yes, you can set it up to be on for a very long time and shut off or the opposite.
@@learnelectronics thanks, and would I be using a relay to power another thing after the first? lets say a washing machine in its program need power to motor, heater, pump, door, etc. at some point in its program. How would you switch between the stages in the program?
I think I now can answer that myself: with a decade counter
I am frustrated. I am trying to create an airplane "strobe" flash, frequency about 1hz, and short burst on. I followed your scheme and the last LED flash that you had is pretty much what I am looking for. However, I cannot get the duty cycle to change when I do it. Only the frequency. I don't understand why I can't. . Could it be the diodes? I am using IN4001s.
I hope to use one of these to generate high frequency pulses to trigger a mosfet or the like to create multi plasma spark high voltage ignition systems for my classic motorcycles
Or a Microchip PIC? Less drifty analogue components...or Arduino...
That sounds pretty interesting!!!
I am not an expert on electronic sthough I could probably knock up a simple capacitor discharge unit using a couple of mosfets, cheap inverter booster module and capacitor
I guess if you had a good steady Vcc, it would not make that much difference if the 0.1 (or 0.01) control cap went to ground or the power rail??
What happens when you change the two resistors from the first circuit for a potentiometer but leave everything else the same?
Does that make any difference in the duty cycle or frequency?
Best regards,
Ricardo Penders
Nothing really. I do that all the time.
@@learnelectronics Hmmm, I didn't expect that, I thought it would change the frequency at least and maybe the duty cycle... I really need to get it on my breadboard and start playing with it to be able to understand it better how it works.
Thanks for your time to answer my questions on this timer ic, I really appreciate that.
Can you show me how to make a rapid fire button 555 with about 15 clicks per second and adjustable for a faster or slower rate for a PS4 controller? Please Thank you.
I finally broke down and bought some bread boards like the ones in this video, I have been tinkering before, without them, I guess it will be alot easier, than soldering, and unsoldering , when I grabbed the wrong component, or had it reversed, or just experimenting... I also have some N channel FETs, 60v 30a, and assorted 1w zener diodes, and some 1/8 & 1/4 watt assorted resistors, and I have a PNP, a couple pots, a bit of solid wire, I'm going to get some male headers , to make things easier, the 20-22g wire is a bit large for the board, and the other I have is a bit small. I guess I need some caps, what would you recommend to go with the boards, that will not go to waste, I am more in to power supply and switching, type projects, basically what I know is what I learned by doing, or reading , or what I learned from you and a couple others here... I would like to get in to the arduino and pie world,, I'll have to get my little in house work area together, I'm halfway moved, to a off grid house, and I have a " engineering room " where the inverters, charge controllers, batteries, and all that jazz is kept, I have to finish all that , and finish my work area, and build a computer, loads of work! I as till need to build the voltage regulator for my DC generator project, and I need to build a high current well basically a DC- DC SSR, to handle 500 amps at 60v to be safe, to go with my BMS, as part of the battery management, to disconnect the load if things go bad,,, anyway thank-you for a the video info!!
Get an assortment of electrolytic capacitors and 1/4 W resistors
I am about to make a santa jumping jack automated with a servo motor. So I have to find out how to toggle between 0.5mHz and 2 (2.45) mHz with a cycle time of 10%. This will make the servo motor toggle between -90 degrees and +90 degrees. I Think I can use your circuit to do that, but you dont mention the math to calculate the signal and cycle time. Would you do a video on this? And perhaps also explain how to make the servo motor run slowly so santa won't scare any one :)
'GOOD'😁 very good 👍🏿
I don't think you should tie pin 5 to ground with a cap. It applies to monostable circuits but not for astable circuits (not sure about bistable). The reason is because, as its name implies, pin 5 allows you to send a control voltage to the 555 for ALL kinds of powerful stuff, such as synching another oscillator to it.
You're right. Pin 5 can remain open. But I hate a floating pin. I like unused pins tied high or low or high Z. Uncertainty is never good in electronics.
Unless you are making audio noise makers. 😂 Cheers!
Having a cap to pin 5 prevents any transient noise within the chip. If you have pin 5 floating; it can cause false triggering within the pin. For example; If you have a monostable 555, with an unused pin 5, your duty cycle can become false triggered and reset the cycle or shut it off completely.
If I send you a video can you basically tell me what kind of generator it is the video is not real clear but I more than positive he used it as a weapon
I'm new at this, so hadn't heard of the 555 until these vids. Thanks!
For anyone that can assist, I'm looking to get into a newbie soldering iron. I have small project I'd like to take my first stab at soldering. I have most of the consumables, but am struggling with a soldering iron. Not looking for the cheapest option becausef I continue learning I'd like to have a tool that I enjoy using overall and am not fighting with, but reviews on soldering irons/sets I've looked at seem all over the place. So, anybody have a good suggestion for a novice. I'm thinking something with interchangeable tips at the least. I'm not necessarily looking at a $10 tool, but lets say I'd spend about $100 or less at this point.
KSGER T12
@@learnelectronics Thanks Paul! Interchangeable tips, temp adjustment, and good pricing. Looks like what I'm looking for.....can I go to your Amazon shop and add it and you'd get the support?
Ah, more ‘555’ fun, thanks Prof... 👍🏻
Question - can a ‘555’ be used over and over? How does one know when it is no longer viable?... 🤔 🧐 🐍
555 times are in every electronic device in the last 40 years. They are pretty hard to kill. The only test to see if it's working is to set it up and try it.
AND...
Thank you so very much my friend.
My "duty" cycle is adjusted by how much I eat the day before. 🤔😂😂😂
Ain't that the truth?
Set playback speed to 1.25X to save time.
Is this suppose to be for beginners? not being sarcastic its just that even if I do my best to copy this and have watched, well if not all, then many of your videos several times, I'm still not confident enough in the values of the capacitors which you switch "all the time" and dont mention the pot. So I cant copy this at all. My multimeter shows no frequency at all because I havet got the right values. You dont either. C1 was suppose to be 1uf (microfared?) but the one you have is 63 puff ??? what the h is that? sorry its just too messy for me as a beginner. I also miss a close up of the second breadboard with you explaining. If you did that you might had clarified something about the pot and the c1.
I love it when we can have fun with a five five five hey Paul can we have fun with the 4017 that would be a great time also
Failing that, lets be naughty with a sailor!
Uh...🤔
I'll see what I can come up wirh
mark
Or get a bottle of Tipex instead of going back to bed!
Just wanna say something about your comment about your hand
This is what ALLAH choose to you and you should accept it as is
by doing so you glorify your creator where the outcome is in your side
I pray to ALLAH to bless as well as grant you recovery from your ailment
I 'should have written', not 'I should have wrote'. Apart from the poor grammar, a good post - thank you.