TRIAC AC Dimmer Circuit - How to dim AC Power for Motors and More
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🔥How a TRIAC and DIAC works and a basic AC dimmer circuit. I explain all the steps. Check the scheamtic below and dim AC voltage for motors, light bulbs and more.
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00:00 Intro
01:50 How TRIAC works
04:45 AC dimmer Circuit
05:57 Analyze Circuit
07:40 Big AC Dimmer Circuit
09:17 Homemade Circuit
10:36 Thank You
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#TRIAC
#dimmer
#circuit - วิทยาศาสตร์และเทคโนโลยี
![How to reuse Washing Machine Motors [Arduino vs Basic Triac control]](/img/n.gif)
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can i use 3 circuits of ac dimmer to control voltage of 3ph induction motor?
Andrei, another excellent video. I'm glad you did this follow-up video from your other motor control video. You did a great job explaining that circuit. It was very helpful. Thank you for taking the time and effort to create this and share.
I watched tons of videos regarding Triacs and could not get the real idea but after watching your video, it went straight into my mind. Thanks a lot. Very good delivery method. You got yourself a new subscriber.
I didnt know triac need separate pulse for both directions, thanks this was very informative.
You always do such an amazing job of explaining things. Your diagrams and animations are fantastic.
I made some disco lights in the 1980`s with Triac`s. I used a tape recorder to send a voltage to a decade counter and it controlled 10 triac`s using the output speaker connections as a output signal. You could put the tape recorder in record mode to pick up sound.
Amazing video...
But what is the important of bridge rectifier
Incredible video! Super easy to understand, congrats!
Another great video. Can I suggest that at this point 9:50, you should have put it into a plastic box as a demonstration of safety. Turning the pot and holding the circuit still, isn't safe. Someone may decide to give it a go and then forget that the normally low voltage protoboard that they're using is now at mains voltage. I experienced 240V when I was nine and I went flying across my bedroom.
Great video brother.. Lots of love from India... it aggravated my love towards electronics.
Thank you for the great work you did here in this video
Clear and concise explanation.
Muy interesante. A ver si lo subes en español para para poder enseñarlo a los alumnos. El funcionamiento de un triac está muy bien explicado. Felicidades
Fantastically explained, thank you.
excellent video, very easy to understand and follow up
The triac (thyristor) stop conducting if the current is less than the holding current (Ih). This is not obviously the zero crossing Voltage. (For example inductive loads like a motor or transformer.)
There are two conditions actually. Falling below Ih and reversing the mains current will unlatch the gate current.
@@lolsypussy what that means? I am looking for dimmer to regulate flow with 220v ulka water pump, 50hz, 48w. I saw ppl using mainly dimmers that regulate lights,but someone also used this triac one, which I read is used to regulate revving motors such as drills. What's the difference ?
@@martinkulik9466 i actually have this generic triac PCBs that i manufactured for my college class but haven't had the time to test it out. I'm planning to use this to control the flow rate coming out from a submersible pump
@@martinkulik9466 the triac circuit is basically the same. Depending on the application, certain components are added for protection like a snubber, or addition delaying components to further delay the firing of the triac thus lowering further the output power
@@martinkulik9466 the triac circuit is basically the same. Depending on the application, certain components are added for protection like a snubber, or addition delaying components to further delay the firing of the triac thus lowering further the output power
Amazing Video, I can learn so much from u, thanks man :)
Thanks bro love your videos!!!
Hi from Türkiye, And thank you so much
an excellent work and wonderful explain
If the R/C combination is altering the delay before the ON signal, why does the ‘scope at 10:08 make it look like it’s the OFF time that is being adjusted? Is it an effect of the inductive load?
Great explanation!
thank you so much for this video.
thanks, very cool again 👍👍
have a nice week and keep going 😊
Were you not using isolation when probing mains AC?
I usually don't like to do 240V circuits on 2.54mm prototyping board or at least I will use single sided protoboard and remove unused copper pads.
Thanks for clear explanation...
7:46 For what reason is the bridge rectifier placed in the circuit? And how do we calculate the components value?
Excellent Video!!
Thanks! Do you think those devices work for 12VAC too, or is it too low voltage? I need to be able to dim small 10 to 35W halogen lamps. Thank you!
Hey bro. The value of 3302 resistors is equal to 33K ohms. This numbering is for 1% resistors. I guess you have written the value of these resistors in the schematic as 3.3K ohms. I love your videos and I always make your projects. I also like the tone of your voice and your beautiful English accent😊
Very good explanation,
amazing channel!!
I purchased an SCR dimmer that looks exactly like the one at 5:13 in the video. So, based on the video and oscilloscope this dimmer is a trailing edge SCR correct? Trailing edge dimmers are supposed to work with dimmable LED lamps, so hopefully the one that I bought will work with my pool light LED driver that is rated at 120v AC . Here in Mexico the standard is 127v but it commonly varies up to 135v and I want to use the dimmer to lower the voltage by about 10%. What do you think about this?
wuld those triac work on phase shifting sensors or inductive pick up coils pulse generators?
Thank you
I have a small cheap portable induction cooktop (lots of mosfets inside). It works mostly fine but at low power it does not only dimm anymore, but powers on and off the induction coil as well. Not a problem in itself except when using it in a solar pv system where the inverter will constantly "lose" solar power trying to match the rapidly changing cooktop, making other stable appliances use grid as well even with plenty of sun.
Is dimming it with a triac a bad idea?
Superb quality 👍
Great explanation
Great video Thanks!
bro u anwserd the question i seeked after for many moon thank u
Thank you very much for providing Demo of Dimmer working ( firing angle display in lab), using quadrac like combo.
Jussojuan surender singal
Hello, does this work for 110 AC as well? Thank you for the informative video!
Is this how soft start works on the motors on power tools like table saws work?
Thanks for sharing AC dimmer Voltage Regulator for speed controller, instead of 500k can i use 100k Pot, Please suggest if so any other components are required to change.
Sir, how to make the timing fine?.,i have a dimmer here but it's too coarse .,pls advice me.thank you
Hi ! Is it possible to achive some sort of PWM with DC and a triac ?
does this work for universal brushed motors only ? or can work with induction motor
Super, thank you
So this also changes the output voltage and waveform. I think the sharper waveforms can affect/damage motors in the long run while its ok for bulbs & heating.
I'm looking for a device that can control & adjust the power supply from the wall socket while maintaining the voltage at 240Vrms.
why when in the osciloscope there's "more wave" (bigger conduction angle) the power seems to be less since the motor spins lower?
EDIT: it would've been good if you explained the minimum conducting angle due to the RC trigger
1. @7:54 what is the role of the bridge rectifier ?
2. It was worth mentioning the triac must be of snuberless type, otherwise you'd have to design the snubber network...
In the simple circuit, when the load is off (the DIAC threshold isn't reached), the voltage over C1 lags the input voltage. When the input voltage rises above 0V after the zero crossing, the cap still holds a negative charge from the previous cycle. So it starts up from a negative voltage. If the potentiometer is moved in th edirection to turn on the load, suddenly the TRIAC will fire. This will discharge C1, so at the next zero crossing, the voltage over C1 starts at 0 for the next cycle. This means that it reaches the DIAC threshold quicker in the next cycle. The result is a hysteresis effect, where power snaps up abruptly from zero, and you have to dial down the pot again to maintain a lower power level.
The bridge rectifier discharges the capacitor (C3 in this case) when the input voltage is close to the zero crossing, even if the TRIAC doesn't fire, making sure that the cap starts charging from 0V in all cycles, both where the TRIAC conducts and when it doesn't. It gets rid of the "snap" effect and makes operation at low power levels much smoother.
@@HerrNilssonOmJagFarBe Thank you Jonas for the detailed explanation, much appreciated 😀
Thank you very much Jonas for your explanation. It is very helpful to us beginners. Thank you.
What am I doing wrong if the potentiometer is burning up when set to low resistance?
I set this up on a breadboard and worked fine. But now when i soldered it doesen't.
Only difference I know is that I am now using 4 triacs connected together?
Can I swap out the potentiometer for a microcontroller controlling it digitally with PWM?
I assume that somehow the potentiometer was getting VCC and GND, can I hook these up to 5V In and GND and then the analog signal pin be replaced with a micro controller's PWM pin?
Is there a way to attain a 100% duty cycle using this circuit? Thank you!
These are excellent for resistance heating devices but for ac motors especially ac induction motors it can be hard on your coils and the bearings. If you have sufficient cooling you really wont need to worry about that and it's not always the case but something that can happen. From what ive read about peoples experience it depends on the manufacturer but it's like 20% of people seemed to either fry their coils or like in my case keep having bearings go out. Could also be how i used it or others rewired the device wrong. Just figured id throw it out the to take into consideration. For what its worth this circuit absolutely does control ac induction motors.
These are also sold as "solid state speed controllers" I believe. Please correct me if I'm wrong.
Does this method allow less then half the power to be transmitted?
very useful thanks
What varies at output
Current or voltage ??
Can this circuit be used for 120v 300 watt rice cooker ?
Thanks for sharing
tenes un diagrama de como agregar un soft start para motor ac monofasico?
Amazing ❤
Very very good sir
Why does the new Triac get short circuited, for 80 w globe it works for test. but my my vacuum cleaner with all right parts it goes to full speed no control.?
Good one.
Superb 👍 , BTW could you make a tutorial on controlling ac appliances with arduino without relay ?? I need that for fast switching of ac current ( on / off )
yes that would be cool..👍👍..and/or frequency converter?
Hi!
Noob here, I was just wondering how much W will go over the potentiometer?
With only 4,7kOhm and potentiometer turned to 0, would not this be several watts?
// Mikael
I read this dimmer is not for lights... Only for revving motors. I can't decide with dimmer to use for ulka 220v 50hz 48w ulka pump to regulate flow. This or the one used for lights. They use different mechanisms supposedly
again, one of the top content creators on TH-cam, you proved it this time too
Awesome 😎
perfect❣
Is there any way to use 20K pot instead of 500K. Please let me know.
Subscribed.
Why didn't you speak about snubber circuit?
Hey, have you seen the linus tech tips video where they do peltier cooling again? they mentioned your video as a good explanation of how they work
Just seen it 😱
@@ELECTRONOOBS pretty good praise, hopefully get you some new followers, you deserve it, your content is awesome!
For a motor, what does this do to torque? Does it stay the same, or decrease with the dimming of the AC "pulse" (or whatever you would call the dimming feature)?
same questions
You are essentially limiting power which affect both torque and speed.
@@flyinglack so its different with dc pwm ?
Thanks❤
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thank you so much. but can you explain my teacher's question: why do we need to use zero crossing when control power of AC load ? thank you.
Because you need to fire the activation pulse of the TRIAC always at the same time. And since AC is oscilalting, in order to syncrhonise the pulse, we detect the zero corss and then we apply the pulse after the same amount of time, every time.
Please show the full circuit with all components & values. Cheers
Why theres burning/flaming inside potensiometer when this circuit used with drill? Tx u sir 🙏
The sparks that cause flaming/burning in the potentiometer are the consequences of the voltage spikes generated by the motor in your drill. You can get rid of those voltage spikes by soldering a small ceramic cap between the poles of the motor.
Perfect WOW
Thanks for this post,very informative,i was trying to use ATTINY85 with this code instead of Arduino uno for pot control firing angle of triac ,please help me with necessary changes.
hello sir when working with high voltage why dont you use a differential probe so not to kill your scope
Also why not making a soft starter with phase angle control just as great scott did in his video. Anyway very nice video
謝謝您！
: ) Thanks.
Why schematic of AC induction motor speed control are so rare??
Can we make triac using BT 169 SCR as reverse parallel connection with common Gate
You'll need two timing caps, two diacs and two generic 1A diodes
hmm is it safe for the device in a long run? i have a fan, and wanna try to apply this but still not sure
No, it is not recommended for any kind of motor using TRIAC. You should use VFD for AC motor variable speed. TRIAC only ideal for resistive load such as tungsten-filament or halogen lamp.
5:13 the circuit diagram lacks the multi-turn pot.
can we use ac dimmer with arduino and control it by both manually as well as by digital means using hc-05 or some wifi modules?..... can you help in this please
You can substitute the potensiometer with an LDR and a LED.
I have a video on that. Bluetooth AC TRIAC control and is made with Arduino! You have to read the zero cross of the AC signal with optocouplers
How to mitigate the annoying buzzing sound tho???
How can we make an AC dimmer which can be controlled by just an external analog voltage (0-5 volt) with out any micro controller
You can substitute the potensiometer with an LDR and a LED.
@@iblesbosuok yes I can also give a variable voltage supply from 0 to 5 volt using LDR but I want to give the 0 to 5 volt supply from a DAC
@@subhabratabasu266 you yourself have to learn that part, not me
@@iblesbosuok yes I am working on it I asked for if there is any suggestions
4: 57 What is the function of this little blue potentiometer?
I would prefer an answer to a heart sticker ;-}
came here to ask same thing! its not on his schematic diagram.
I recently purchased what looks like the identical item, and it seems to be in parallel to the main potentiometer that the human uses (no guarantees on my reverse schematicing). The blue pot has 'w 205' and '302B' on its top surface, so i was thinking it was 2Mohm but maybe it is 3k? One good thing is the oscilloscope shots were different: I wasn't getting the same waveform as electronoob was, it was really not doing any waveform limiting at all, so for me, i am thinking the factory set it to a low resistance such that the thing was charging up too quickly and triggering straight away, try it tomorrow- the video helped me trouble shoot.
addendum: i rechecked the schematic and yes they are in parallel. So its kinda doing not much - maybe it is trimming the 500k pot to some exact value? In a manufacturing sense this could be seen as waste, so i was thinking maybe it was a pcb layout error, and i cut a couple of tracks and rejoined so the blue pot was in series, which allowed an upper limit to be set if needed- (my application only wants a max of 90v).
ps the oscilloscope shots were different because the load i was using was too small to maintain a holding current on the scr, once i used a generic lightbulb, the traces were the same as the video.
As making hundreds PCB each year I can tell you that: october prices at PCBWAY is really more expensive than JLC !
may i know the function of R1 and C4 in the circuit?
thanks guys in advance...
Snubber network?
thnx
👍👍👍
its making an humming sound please make a video how to reduce that sound