Circuit Skills: PWM (Pulse Width Modulation)
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- เผยแพร่เมื่อ 31 พ.ค. 2011
- blog.makezine.com/?p=98982
Another clever trick from the world of electronics - Pulse Width Modulation is a simple method for controlling analog devices via a digital signal. It's also an efficient way to drive motors, lamps, LEDs & more. - แนวปฏิบัติและการใช้ชีวิต
The Alton Brown of circuitry
hypno toad this is the highest compliment. Also the most accurate.
Another fantastic tutorial from Colin. I love the way he explains all of these difficult concepts in a clear way with visible examples. I can't wait to see more from him!
Colin? I dont know if you still read these but my name is Will and you inspired me to love electronics through your videos. you are my hero and I would really love to meet you. thank you for everything.
but... your name is Nigel Cooper... o.O
Collin......you are DANGEROUS with that soldering iron. You've got mad skills. Keep up the good work. All of us enjoy what you do.
Dude, this was awesome, not only is PWM used on stuff to control motors, brightness and other devices, it is also being used in cars for the longest... PWM in a car is used to modulate the velocity of a blower motor in an A/C sys. on today's modern vehicles. There's a bunch of electronics in today's vehicles using this stuff. dude you would make an EXCELLENT driveability technician at any dealer! I wish i had mad skillz like you.
Collin is nowdays the only reason i am a subscriber to makemagazine.... Subscribed for kip kay, stayed for Collin :D
This made me finally understand the principle of PWM. I just needed a visual confirmation of what I thought. Thanks! :)
when i saw colin uploaded a video my heart gave a little extra beat. i think we must be in love.
His mannerisms crack me up every time! Man! I wish he had more shows...
Collin! You should be teaching!!!
Not only on youtube but around the world!
I guess we would see many more young people beeing interested in electronics if we had teachers like you!
Thanks for another interesting video!
Your acting skills are legit and solid!! Thanks!
MOAR CIRCUIT SKILLS!!! I love this show, Collin's lab and Weekend projects!!!
Thank you for the explanation Trevor
Great vid, and fantastic sideburns, brother.
Presented very brilliantly. Thanks a lot.
PWM is also used in computer fans and fan controllers to lower overall system noise, it allows the fans and the fans motor to be a lot more quiet at low or high speeds.
Just love your videos Collin, great work as usual! Keep it up :)
I'm learning more from this than my actual classes.
Very cool. Thank you. Looking forward to watching more of your videos. 😎
Yay! another video by Collin!
Quick note/correction:
The part explaining that 12V at 50% duty cycle is 6V is inaccurate. A 50% duty cycle would give you 50% the POWER of that at 12V (think of it like you're running it at 12V but for half the time).
This does not mean half the VOLTAGE though (Imagine a simple resistor: P=V^2/R, so half the voltage amounts to 1/4 the power, not 50%)
nope. power depends on load, no load information, no power information. It's a VOLTAGE waveform so 50% pwm of 12V = 6V average (DC). If you had 12 Ohm @100% (12V) = 12W, @50% (6V) = 3W; 25% power BUT still 6V is 50% of 12V
I enjoy your videos. They are educational and very well done
Awesome, a new electronics video from Collin. :-D Love this stuff, keep up the good work
Great presentation!
I have a feeling you would've been one of the ones to do it and he's making much more money than you could ever hope to.
@humxa24 A potentiometer is a variable resistor. The point of using PWM instead is that it doesn't waste energy like a resistor does.
finally a new circuit skills vid!
Thank you for a very nice explanation.
This is a masterpiece!
Colin, Great video. I LOVE putting kits together as well as my own simple stuff. No Electronic genius here.. :)
what a fancy soldering iron u have sir.👏👏
@Desmaad those are resistances, the bigger they are, the more power they can handle
MORE CIRCUIT SKILLS! MORE MAKE PRESENTS! I WAIT FOR THESE FOR MONTHS! COLLIN FAN HERE!
Nice tutorial, did this powering a LED without a resistor, to have it shine extra bright without burning it. ^_^ And dimming works great to.
Haha for such an educated gentleman, Collin has a very good sense of humor!
This was very usefull! Very nice explained! Thanx Collin.
awesome explanation on pwm, thx.
Well done. I like it. Two thumbs up.
great video!
though in general it is simple, but the way you explain things is exiting :)
I learn more from Colin than I do from school...
PWM -> Pretty Wild Man ^^
Yeah, recently saw the Video and I'm amazed by it.
I never get tired of watching your videos Collin, thanks mike
PWM has long variety of uses from controlling the speed of a motor to the blinking speed of a LED and many other things. The video is very interesting keep up.
Nice job, man.
man, you are awesome! i'm learning a lot with your videos :)
Awesome!!! im gonna have to give it a shot
You're sooo funny, I remember seeing this in class!
Dude, you need a TV show.
Fantastic that you're into electronics at your age, you might invent useful things for the marketplace one day and make money from them. You should probably do an electrical engineering degree.
And yes, this guy definitely needs his own TV show. He's great to watch.
Ale Lav I am 13 and I love electronics too.
+ Ale Lav ikr
@Desmaad pretty sure they are ceramic resistors, basically acts like a heatsink around them
Finally get it now. Thanks
Awesome. I actually learned something in this video. (Rarely happens if Collin isnt in the video.)
Hello Colin, nice video. Does DMX uses PWM for controlling the lights? Also when using PWM for dimming a light, it does consume less electric power ?
i would like to see more examples of this - maybe with arduino?
i actually had an idea a long time ago using special light bulbs that were designed to work at maybe 50hz instead of 60hz. if you are using the full amount of current, how does that apply to the brightness ratio? aren't you being more efficient, and thus, it would stay bright? when would you actually notice? if it flickers, cant you use a capacitor to smooth it out? or would just using a lower wattage bulb be better?
PWM is also used in digital music. Nice vid.
These videos simply never seem long enough.
Just amazing!
clear and brief explanation.
@TheTranceMusicLover actually, PWM sends pulses, meanwhy an LM317 limitates the voltage that pases through it, so it makes less heat than a limitating resistor, but still generating heat, that means you still losing power. So in conclusion: is better the PWM than the Voltage Regulator or the Limitating Resistor. Hope that helps:)
Very interesting, I'll remember that forever.
Word to the wise, PWM isn't an acronym, its an initialism.
I subbed for Kipkay what seems over a year or more ago, but I have learned to love Collin's lab because I learn a little every new video! I just wish they would slow up with the personal blogish type videos :/ Good with the bad I suppose.
I too, have become a Collin Cunningham fan. Thanks Collin
I spotted a copy of "the art of electronics" by Horowitz and Hill, very good book on electronics.
COME BACK COLIN, WE LOVE YOU.
@ccrimsonfox I think it's more for changable voltage without a big chunky resistor
what is he point of the PWM if it is just proportional to the input voltage? I thought the whole idea was to control duty cycle in order to contrl (for example) the speed of a motor that is running on a 12 volt dc input.
If I have to control the input voltage already, that begs the question how am I doing that?
Sweet, thanks for the vid, I am going to buy this kit to help introduce me to PWM, so that I can control a 30 amp power supply for a HHO cell.
You just explained to me what I hadn't gotten in my entire year. My teacher really sucked.
awesome video!!! but doesn't a potentiometer do the same thing?
you are the best in make magazine but after kipkay
Collin, aspberger light. i love this man! :)
nice video man really helped me!!!!!!!!!!!
@humxa24 A potentiometer is a variable resistor. as he said in the video, resistors produce unwanted heat.
Output duty cycle = CONSTANT * DC Input Voltage. The constant is just a number which doesn't change, so when you increase or decrease the DC voltage, the duty cycle increases or decreases (they are proportional). How much it changes is dependant of the magnitude of the constant. A lower constant will give you a smaller change and therefore more sensitivity.
@htfkid2000: No. PWM doesn't work with timing. You can change the frequency to whatever you want, timing doesn't matter, but the output power will depend on the ratio of the on to off portions of the duty cycle, and that ratio can be continuously variable. Digital in binary, analog is continuously variable.
Pretty Wild Man, I see what you did there.
Hi Colin , The maximum output of the pwm was 21v , that is fine . But the Amps can be 2 to 4 Amps or greater . Will it not fry the scope ? Also you had 3 probes and 1 Earth. Please explain.
Thanks .
really great m8 .. keep up ->
you would be an EPIC teacher
You mentioned wasted power in heat. From the look of that voltage regulator and the heat sink. You are still generating some good heat.
Can you explain voltage maximums? I would like to use PWM to pulse a higher voltage near 250+ volts and add in 5 milliamps for "voltrolysis"
Make: can this be used for 2 red electroluminescent light strips 17"x 3" to control the brightness from half power to full power to represent the difference beteween my running light and my brake light by using low mode for running light and using high mode for when brake pedal is depressed.
Would like to use one to control the 2 amber blinker lights as well. Im retro fitting my cars tails light and love the crisp clean look of electroluminescent. No hot spots =]
@FractalDistortion PWM works with something called TIMING... You time each pulse, but every pulse is the same strength as the time between each pulse increases the intensity of the LED or motor decreases... it's all in the physics of how analog devices work!
dude make your own channel i would subscribe in a heartbeat.
Would a larger version be a more efficient way of throttling an electric car? (DIY of course)
Can you please make a video about correct soldering? It would help me a lot.
It's K8004 "DC to Pulse Width Modulator" from Velleman.
Right so say you wanted to fade a bedside lamp on ac volts ,could use pwm on that ?
I'm sure this is a dumb question but could this board be used to control a dc to dc ssr to control a treadmill motor? I'm very new to this if you can't tell haha. Thanks!
Your the only guy worth watching on this channel, do you have your own channel?
You can use a 555 circuit to generate a pulse which would trigger a transistor on and off which is far more efficient.
could you use a filter cap or inductor to smooth the sqaure wave
The best part about this video is that you're using a bent conical tip Metcal. Everyone gives me such a rash of crap for using it all the time instead of the cultish following the chisel tip uses, but it's very comfortable and not all ham handed when you're trying to get into a tight spot.
I just got into circuit building and was wondering.. what are those big white things that he solders into the PWM kit?
Pretty Wild Man
Omg this dude is freakin funny. Great video guys!
Hey Collin, could you post the schematics you redrew for the PWM? It's not on the Jameco site, and I can only get a fuzzy view of it from the video. Thanks!
@muh1h1 Get the coverleaf app, I think you can view digital editions on that :)
What is the soldering iron you us also what tip i like the bent type
I am so glad Collin is advertising Jameco and not Netflix or some shit :P
Great video man. More of these pl0x :3