Dear Skiny R&D, this is the best video on the internet, I am a DIY person that likes to mess around with the 555 timer. The more I watch your videos the interested I become in electronics. Thank you kindly for the help. Have a great day...
@peterwilson696 жыл бұрын
This video is by far the best tutorial I've seen. Very well explained, very clear. Keep up the good work.
@Skinnyrd6 жыл бұрын
Thanks! Glad you enjoyed it.
@mrroobarb6 жыл бұрын
Very thorough and easy to understand explanation - I subscribed to your channel about a year ago after watching your previous 555 videos. Great to see you back, keep up the good work - it is appreciated! Bruce.
@Skinnyrd6 жыл бұрын
Thanks Bruce!
@SynthMan653 жыл бұрын
Excellent tut, Jason!!! The best and probably the most "turnable/versatile" and most stable PWM CKT of the three basic 555 timer PMW generators I've seen out here so far. This particular configuration of R1 and R2 at 10 K is exactly what I was looking for. I'm going to take this circuit and modify it to drive a 180deg servo motor between 0 and 10 degrees (that's the requirement). I'm def going to use the schottky diode for a cooler temperature circuit and better overall efficiency. Thank you so much!!
@fmdj Жыл бұрын
Awesome, thank you so much! Best explanation of this circuit I've seen, you just got my subscription. I'll build this version. For those who, like me, prefer algebraic expressions for analysis, you can show the theoretical invariance of the frequency like so (all the credit is yours, I just reformulated some of your expressions): Rx = Pot R (pin 1 to pin 2) Ry = Pot R (pin 2 to pin 3) Pot = Rx+Ry t1 = ln(2)*(R1+Rx)*C1 t2 = ln(2)*(R2+Ry)*C1 T = t1+t2 = ln(2)*C1*(R1+R2+Rx+Ry) T = ln(2)*C1*(R1+R2+Pot) f = 1/T = 1/(ln(2)*C1*(R1+R2+Pot))
@VeryMuchBlessed3 жыл бұрын
Very helpful information. Being able to adjust the duty cycle makes the 555 all the more valuable. Thanks much.
@saidbaci43446 ай бұрын
It's really a nice piece of smart work and also very well explained. Thanks a lot.
@steveng55036 жыл бұрын
Great to see you’ve not deserted us. Thank you for these videos, makes me feel the need to get scope out.
@Skinnyrd6 жыл бұрын
Dust it off and get to work! :)
@tehdusto3 жыл бұрын
Yes - this is the best explanation after days of searching. I find most people shy away from the math, but you need the math to actually understand what is happening.
@0dbm2 ай бұрын
Thank you , thank you Frequency vs PWM has been killing me , thank uou
@ashwinshetty19614 жыл бұрын
It's was almost a year ago when i had first watched your content on working of 555 in astable mode. Today after having some experience in electronics i was wondering how could you use a 555 to vary duty cycle without altering frequency and that's when i found you again. Hands down your content on the working of 555 is the best out there. Thank you so much !!!!!!
@malcolmholmes1152 жыл бұрын
Wondering how to to same, but with a feedback voltage instead of potentiometer
@skullanclawbones4 жыл бұрын
Man, I love the 555 timer and your explanations of the current flow and the math around the 555 really do make it just a bit more awesome!
@ciprianmalaes49676 жыл бұрын
Finally someone how can explain what’s happen precisely while making a PWM. Thanks a lot for your video.
@Skinnyrd6 жыл бұрын
Thanks for watching!
@bkj242 Жыл бұрын
Very good explanation of the pulse duty cycle while keep the PRR constant.
@tafesekasa55582 жыл бұрын
Method of teaching was good & honestly helpful.
@overengineeredinoz7683 Жыл бұрын
Amazing video and such a clear explanation.
@bernym40472 жыл бұрын
Very clearly explained. Thank you. I am going to try to adapt this to control a servo motor. I intend to use two MOSFETs to swap two fixed sets of resistors to give two fixed duty cycles as the servo motor employs two duty cycles, one for forward, the other or reverse.
@jtb86314 жыл бұрын
Thank you SO MUCH! I have been looking for exactly this for about two days. There are other explanations, and attempts to do this, but they are all way to worried about achieving 0-100% duty cycle, and they either don't work(when I have tried them), or are too complicated for me. Also, you bothered to take the time to go through and actually explain, in an intelligible and concise manner, what each part in your diagram is doing. A+++, subscribed.
@0dbm4 ай бұрын
Thank you for your video , it’s all about those brushless dc motors, and controlling those ESC with a variable duty cycle , I’ll get it with your help , thanks agsim
@pleaseyourselfsir6 жыл бұрын
Wow ! What a fantastic video ! Thank goodness the ‘alerts/notifications are working ! I absolutely love this , detailed and in depth , ....and intense maths ! - ....made that little bit easier ! Bravo and Thank You ! Very educational 🤓🤓🤓🇬🇧🇨🇦🇺🇸🍻🤝👍🏻💪🏻😎 ..... Questions I have for you , if you have time to answer them .... Q 1 : Can a 555 timer chip be used to produce 1Mhz frequency ? Q 2 : ....if so , in what form , AC / DC / Pulsed etc ? Q 3 : Can it be used to to produce the output of a transformer ? ..... why ? .... I am trying to find a method , practically any way , to produce a diathermy machine that outputs (of the electrodes ) a 1Mhz frequency , [300 ohms] 75-105 watt power , and possibly ranging from 10 to 55 KV with a 5ma to 60 ma , and I am stumped on how to do this at least semi-professionally . I have most electrical tools yet I am still a novice at using my Signal Generator and DC supply in these instances . If you have any answers I would love to hear your input , every bit of info helps ! 👍🏻😀
@Skinnyrd6 жыл бұрын
Thanks for watching! As to your questions: Q1: It looks like it can if you buy the right type. This one claims it can: www.digikey.com/product-detail/en/texas-instruments/TLC555CP/296-1857-5-ND/277502 Q2: It will be an AC, square wave output. Q3: I'm not sure this is possible with a 555 timer alone especially with the characteristics you are looking for. Maybe you could use the timer to produce the signal you want and then step that signal up using the right circuitry. Seems like quite a build. Good luck!
@HappyHermittАй бұрын
Thank you. I hace trouble with variable resistor symbols in schematics. Theres tons of circuits Id like to build but avoid because Im unclear on the v.r. direction. This helped.
@TheJavaSync5 жыл бұрын
Almost 15mins & I enjoyed whole minutes in your video - loved it
@Skinnyrd5 жыл бұрын
Thanks!
@qu1j0t34 жыл бұрын
This really is an outstanding tutorial. The careful explanation of current flow is extremely helpful. Clearly you really care about exposition, so as an electronics learner it was a very easy decision to subscribe. I have a question about the frequency variation. Is that due to mismatching of the diode characteristics? (voltage drop) and could be reduced by matching the diodes?
@davelowets10 ай бұрын
Great, simple, stable, and effective circuit.... 👌
@techsinc5 жыл бұрын
May I suggest a slight variation that uses a single potentiometer and no other resistors: (1) connect a potentiometer center tab to pin 7 of 555. (2) connect one end of the potentiometer (the first end) to pin 8 and then connect pin 7 and pin 6 via a diode forward biased toward pin 6. (3) connect pin 6 to the other end of the potentiometer (the second end) via a diode that is forward biased toward the second end of the potentiometer. This way, the period is constant and given by the potentiometer resistance (end to end resistance that is) but the duty cycle is variable from 0 to 100% within that period by turning the potentiometer knob.
@Skinnyrd5 жыл бұрын
Cool, thanks for the suggestion.
@dsbohra Жыл бұрын
Brilliant explanation....one thing I must say, this is not Skinny R&D anymore....
@HenryYong5 жыл бұрын
Awesome tutorial. I've learnt so much from your 555 videos. :)
@hacklabdesign Жыл бұрын
great video - I need help with an arduino electronic project - is there a service that can help?
@Sarahbuildsstepsequencers3 жыл бұрын
Jason, can you demonstrate a circuit like this with variable frequency and variable duty cycle in the form of a clock pulse generator (LFO), please? Frequency range from say, 1hz - maybe 50hz?
@doc-holiday3 жыл бұрын
I really liked this video it help me so much in understanding the duty cycle of the waveform. So simple to understand you described it perfectly. Fantastic tutorial. Your a real champion. I am going to mark you down in my book marks in goolge should i need to ask you a future question. Cheers.
@uiticus2 жыл бұрын
Excellent video. Thank you
@rolandberendonck39005 жыл бұрын
Hi Jason. Thank you very much for your great, clear and informative vids. I think they are the best on the web on this subject.
@Skinnyrd5 жыл бұрын
Thanks Roland!
@loranfuell65952 жыл бұрын
Excellent tutorial...
@reddysoft Жыл бұрын
Love the video as it is EXACTLY what I am trying to do. Unfortunately, I set it up and the results were not as expected. I don't have a potentiometer, yet, so I tested with 2 equally sized resistors and just tried to get the on and off times fairly equal. My C1 is a massive 2200uF as I need the total cycle to be about 10 minutes. R1 and R2 = 47k. In the future I will employ a 300k pot. For now I'm using two 150K resistors. My calculations (using your formulas) say the cycle should be 10 minutes, but it ends up being closer to 20.
@1873Winchester Жыл бұрын
This is excellent. Now with a variable capacitor you coud also vary frequency then. Though I believe they don't have large ranges. I am thinking this could make for a pulse unit for an older tig welder, splice in between the pedal and welder.
@bumpymotors2 жыл бұрын
Loved your way of breaking it down Skinny, totaly Favored, Liked and Subbed.
@diamony1235 жыл бұрын
Lovely video, I was wondering could this be done with pin 5.
@fadibselise25832 жыл бұрын
This is so good but can i let it work on 12v or the circuit will burn
@davidknightaudio9342 жыл бұрын
Just a tip if you use a dual gang 50k linear pot with both centre pins tied to gather and 2 pins from opposite sides one from one gate and one from the other to make a single pot you can adjust the duty cycle with absolutely no frequency change like UL get with a single pot and logarithmic pots
@vijayyadav-pb9hd3 жыл бұрын
Very Nice video on 555 pwm signal duty cycle control effectively... let make such a video on convert this pwm signal to sine wave n discuss how to achive in case of sine wave signal..??
6 жыл бұрын
It is great to see you back. Last week was playing around with 4 other variations of the 2 diodes + pot PWM circuit. Yours is the Most straightforward and easy to understand. Thank you for that! Something I found while playing with the different PWM circuits was that the type of capacitor made a large difference on the frequency, ie mylar/film box/ceramic caps of the same capacity gave me very different frequencies. Maybe my cheap caps are too cheap. Do you have similar experiences?
@Skinnyrd6 жыл бұрын
The tolerance on caps can vary a good bit. 20% is not uncommon if you are using certain types.
@acmefixer13 жыл бұрын
What I've mostly seen is a circuit that does not use a 555. The 555 uses 2 different resistances, one for charging and 2 for discharging. The simple circuits I've seen use a comparator or opamp, plus the pot and two diodes. The same resistors are used for both charging and discharging the timing capacitor so the pot does not change the frequency. Instead of using the 555's pin 7, try using the output of pin 3 to drive the pot and diodes. In other words, see if you can get rid of the discharge resistor. Thanks for the video.
@FrankMakesStuff Жыл бұрын
Wondering if there is a way to replace the potentiometer with solid-state components so the duty cycle can be electronically controlled?
@dalenassar9152 Жыл бұрын
How can you make the duty cycle controlled by a VOLTAGE--the frequenct can vary a bit??? THANKS MUCH OR THE GREAT VIDEOS!!!
@gkdresden Жыл бұрын
Also in this case you can save one resistor if you use the output pin 3 to control charging and discharging of the capacitor leaving the discharge pin 7 unused.
@djdoncruz5 жыл бұрын
awesome video. explained it all very well. Mean this is the nicest way but the t1 calculation is slightly off, I get 34.1 micro seconds which then gives a total frequency of 25.1kHz (using all 3 significant figures as you have). Still well within the range of a PWM frequency needed for say a fan signal.
@afzalh.072 жыл бұрын
Thanks for your beautiful explanation. Is there any way to vary the frequency keeping a fixed duty cycle? Thanks again!!
@valakatz39674 жыл бұрын
Very nice video, I have not seen one like it. Great job, I will be back, and thank you.
@malcolmholmes1152 жыл бұрын
Thanks for the great video. What if instead of pot divider and two diodes we want to control DC with voltage, let’s say, from feedback?
@markkennard8613 жыл бұрын
Thanks for posting. There doesn't seem to be talk of Mark space ratio when it comes tovthe 555. My application required 0.5 on and 4 secs off. I easily got 4 on and 0.5 off so then I used a transistor follower to invert it. I'm going to your circuit .. looks like it's just what I'm looking for.
@Bassman733 жыл бұрын
Excellent explanation, thanks for the video.
@DarkMetalFabrication6 жыл бұрын
Looks who's back!
@Skinnyrd6 жыл бұрын
You miss this rugged handsomeness.
@NourDdin-fw5mkАй бұрын
شكرا جزيلا لك عمل ممتاز. مرحبا بك في المغرب.
@mikeoliver32546 жыл бұрын
Glad to see you post another video. Your explanations are great. If you wanted to use a 555 to control the output of a 4017 would it be better to control the duty cycle or the frequency?
@Skinnyrd6 жыл бұрын
I would think that in most applications you would want to control the frequency to get the counter to output the signal you desire.
@domedom22276 жыл бұрын
Hey, just found your Channel and you deserve way more subscribers. Did you check out the Circuit of "Great Scott"? He used just one poti. Would love to see explanation of you about the Circuit! Keep up the good Work!
@John_Smile3 жыл бұрын
I would like to build a source ... Buck or Boost converter. From this clip, I understood how to adjust the output voltage. Question ! Have you made a clip in the past, or can you make one in the future, to show me how I can order a Mosfet IRFZ44 transistor (or other model ...) to withstand a 5 A load?
@innovativeidea12783 жыл бұрын
Hi, Subhranil here, In your case C1 that you have used was 820 pF, So should it be change for different ICs or I can use 820pF with any 555 IC for controlling the duty cycle. Waiting for your valuable reply. Yours faithfully, Subhranil
@andrewel5383 Жыл бұрын
If you made r2 an adjustable resistor as well, would that allow you to then adjust the frequency as well? Seperate from the duty cycle?
@MechanicForGMCCars4 күн бұрын
Could you please give advice how possibly I could change trigger frequency of an MC 3334 ic chip that thing is used on an GM 4 pin ignition module it uses an pick up coil around 1.35 Henry I have lots of those modules and pick up coils .So I do not know what to do what value to use.I have reali hard time starting my engine when it's cold so I tough maybe an phase shifter would work .So I hoppe you can help my understand what estimate values of components what should I use ? So I'm not Shure I believe my GM module works at around minimum 2-3 volts AC at 5stages the timer is controlled supposedly speed ratio for engine the frequency minimum is at 33hrz up to max 333hrz so any suggestions please ?Originally I thought perhaps there is some thing that I can put in between pick up coil and to module to gain that litel phase shift it's around 20-30° angel degree control of IC chip.I did notice my GM module does not have any zener diode would that make significant problem? I did thought perhaps I should use separate battery for the module to not run in to problems so I hoppe for some sugestions about ignition coil module control methods.
@abdelhamidkhattab33252 жыл бұрын
loved it very much
@SelectaBwoy Жыл бұрын
So is this mostly about controlling the rate?
@SoVath-TV-3 жыл бұрын
I like your teaching 555 timer thank you . love your tech
@larrydee88595 жыл бұрын
Great explaining of the 555! Thanks.
@Skinnyrd5 жыл бұрын
Thanks for watching!
@Doom2pro3 жыл бұрын
I use an Op-Amp to control frequency AND duty cycle independently.
@christiangrothe88883 жыл бұрын
Is it possible to also change the frequency with another potentiometer while keeping the feature of changing the duty cycle as shown in the video?
@godles123ag3 жыл бұрын
Is it possible to change duty cycle from 0% to 100% automatically, without a potentiometer and same in the opposite way?
@sametkarakoyunlu88359 ай бұрын
thank you
@trevorhenderson86582 жыл бұрын
Can you trigger this with an external signal? to sync its operation time?
@SukantKumarSahoo8692 жыл бұрын
Very useful video. I wanted to know what is the value of C2?
@movax20h Жыл бұрын
100nF, but smaller can also be used. It is not critical to have it specific value.
@VahidBehravanVahid-Behravan4 жыл бұрын
HI There, Very good explanation and testing, thank you. Is it actually a positive offset frequency?
@felipeacelass.43464 жыл бұрын
good work. is it possible to adjust frequency and duty with a single ci555? can you help me with the explanation and diagram to do it? Thank you!!
@otiebrown99994 жыл бұрын
A good drive signal change for Servo Motors. I will give it a try!
@vijayyadav-pb9hd3 жыл бұрын
very nice discription with 555 pwm generator... can u make a detail video on how to convert pwm signal into sine wave signal with tiney 555 chip...?
@Xambax13 жыл бұрын
is there away to do similar thing - keep duty cycle the same while chaging frequency?
@haippics2 жыл бұрын
Very nice tutorial. Thanks! Still a long way for me to understand how to make an additional brake blinker that lights initially two times e.g 2Hz and repeat after e.g. 3 or 5 seconds . I might do it with two different lights or a single light load. While on motorcycle, I try to get some extra attention without annoying people too much. I plan to leave the main brake light intact. :D
@haippics2 жыл бұрын
I guess I should cook up something out of this but with transistors maybe.... (possibly smaller form factor than relays)...
@haippics2 жыл бұрын
I might just try to add two transistors in the output similar to your other video where you controlled additional 555 circuits but I replace those 555's with Light-1 and light-2 ... kzfaq.info/get/bejne/o6hxbNiByqvep2g.html ...So using only one 555 with "advanced" duty cycle adjustment in this video and the transistors switching lights on hi and lo signals... First triggering light-1 and then light-2 leaving it on for a long time before the next cycle. It is a bit cheating not turning the light-2 off before next cycle starts but might do it's task ok and might work in other light configurations too with original brake light in equation. We'll see if I ever get it done. :D Now someone say this is 4$ ebay? :D
@neoverma20114 жыл бұрын
Sir for 32-100V and 0-28A dc dc converter, potentiometer should be increased or we have to change with R1, R2 and C1? please reply me as soon as possible
@utkarshverma14 жыл бұрын
Saved my ass in time!
@hiranmaydas98764 жыл бұрын
@skinny R&D, Can we vary the duty cycle by varying the capacitor(s)? Is there any method to do that?
@vinod333vijayan5 жыл бұрын
Superb explanation I like it.
@samanttejasr4 ай бұрын
what is the value of the diode? can i use in4007?
@grzesiek1x3 жыл бұрын
but I got the same result with only a potentiometer and one resistor... when I adjust my potentiometer between pin 6 and 7 I can obtain a wide range of duty cycle anyway..
@glennedward22016 жыл бұрын
I think from another post there should be a way to replace the potentiometer with a control board? Motion control or like? How would one go about doing that using the 555 to control mosfets or control interface like an esc without using a manual potentiometer?
@Skinnyrd5 жыл бұрын
Try using something like this: www.sparkfun.com/products/10613
@RahulKhurana853 жыл бұрын
Hello I have a pulse wave coming from photo diode, with T1 = 50-60us, and total time period is approx 20ms. Since this is too short a period (T1) to be detectable I want to increase it to 5ms, keeping the total time period same, how can I achieve that?
@suchitagaikwad7553 жыл бұрын
Can we achieve zero percent duty cycle in this? How to achive that?
@noysantia25106 жыл бұрын
very nice tutorial simple and easy to understand. keep it up so many people will benefit fr u. i have question how to make an oscillator using crystal with adjuatable frequency just like u did in this video thanks and GOd bless u always and yr family
@Skinnyrd6 жыл бұрын
Is your question how to change the duty cycle using a crystal oscillator or change the frequency or both?
@noysantia25106 жыл бұрын
higher
@noysantia25106 жыл бұрын
thanks for yr reply. yes sir thats my question. fr what i observed using crystal is more stable than 555, but dnt know how to put an adjustable one.
@Skinnyrd6 жыл бұрын
People use crystals when they need a solid, stable frequency. If you need to change the frequency coming out of a crystal you can look into using a counter/divider IC to adjust the frequency in discrete quantities.
@noysantia25106 жыл бұрын
Skinny R&D Ok thanks hope u will demonstrate someday if u have time. im new to this kind of things actually i only learned fr u how the 555 timer works. yes i want to use the oscillator in a flyback transformer , last time i used 555IC the frequency so erratic kept on changing low n high. i saw fr other video he uses crystal oscillator and demonstrate the diff between 555 IC ang crystal. the crystal does not affect whatever ambient.
@kuldeepjayaswal99335 жыл бұрын
i need 100khz frq and 20percent duty cycle. c1 and c2 what will be there
@shashankshankar Жыл бұрын
Hey, I need 400Hz 555 PWM output and at 50% duty cycle can someone help with the calculations
@mauricepetit99865 жыл бұрын
Very good video !!!!!!! which value of capacitors should I put, if I don't have some 820 pF ?
@Skinnyrd5 жыл бұрын
It all depends on the timing you want.
@mauricepetit99865 жыл бұрын
@@Skinnyrd Thank you very much for your fast response.
@reddysoft Жыл бұрын
I actually figured out how to decrease my cap size to 1000uF, R1 & R2 = 62.8k and a 250k Pot that should give me a 5 minute cycle. Actually, I am mimicking the pot using resistors totaling 250k with 125 on each side of the cap discharge to get a perfect 50/50 split. It seems to work wonderfully, except...I have noticed that the first 1/2 cycle (ON time) is always about 70% longer than expected but then everything falls in to a 50/50 cycle. Anyone know why this is?
@adoteumgatinhojpa64464 жыл бұрын
Im not even a native english speaker and I full understand it. Thank you
@davidscoggins15605 жыл бұрын
I built this circuit as you designed (I think). Is this circuit suppose to repeat itself. It seems to run once. Is there a way to modify it to flash variably?
@Skinnyrd5 жыл бұрын
Yes, the circuit should repeat itself.
@cotton45706 жыл бұрын
I'd like to see projects using a 556. Please.
@cupcakecups91126 жыл бұрын
thanks for making this great video! super helpful!
@Skinnyrd6 жыл бұрын
Glad you found it helpful!
@pekkagronfors73046 жыл бұрын
Nice one!
@Skinnyrd6 жыл бұрын
Thanks!
@jstwatchnread84202 жыл бұрын
Its for led /lamp dimmer, not for class d amp..
@TSulemanW5 жыл бұрын
Nicely explaination
@Skinnyrd5 жыл бұрын
Thank you.
@yashpatel22015 жыл бұрын
Which capacitor is use if we want to filter this output voltage?
@Skinnyrd5 жыл бұрын
What do you want to filter? DC or AC component?
@jedandecko55856 жыл бұрын
Great video! One question, can I make 20 sec on time with 555?
@Skinnyrd6 жыл бұрын
Thanks! I'm not sure I understand your question though.
@jedandecko55856 жыл бұрын
Ok, can I make 555 timer that will give high signal for 20 sec. So when one of 555 pin get high 3 v, to hold load high for 20 sec? Sorry for bad english :)
@Skinnyrd6 жыл бұрын
Yes you can do this. You will probably want to use the 555 timer in monostable mode. Here's a video I made about it: kzfaq.info/get/bejne/ZptnpJmnnNvbp4k.html
@jedandecko55856 жыл бұрын
Great, thanks on your help.
@yazuraz6 жыл бұрын
Nice!! is there any way that i could control the timer duty cycle using a controller lets say an arduino
@glennedward22016 жыл бұрын
@Yazu Razbhandari from my understanding you wouldn’t need a 555 and the uno can control pwm as it is. Unless you’re referring to a motion control output for something like spindle control than that is a good question I’d also like the answer too. There is always a way but is it simplified where it’s worth the effort involved?
@adityakaveri98105 жыл бұрын
Nice video! But can anyone make circuit which has constant duty cycle having varying frequency using 555?
@Skinnyrd5 жыл бұрын
Yes they can. Check out this video around the 13 minute mark. kzfaq.info/get/bejne/jdd3pJyK25fIj4k.html