TRIAC AC Dimmer Circuit - How to dim AC Power for Motors and More 

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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.

Incredible video! Super easy to understand, congrats!

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.

Clear and concise explanation.

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.

Fantastically explained, thank you.

Thank you for the great work you did here in this video

thank you so much for this video.

Amazing Video, I can learn so much from u, thanks man :)

excellent video, very easy to understand and follow up

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

Thanks for clear explanation...

Thanks bro love your videos!!!

Great explanation!

amazing channel!!

Excellent Video!!

thanks, very cool again 👍👍 have a nice week and keep going 😊

an excellent work and wonderful explain

Hi from Türkiye, And thank you so much

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.

Superb quality 👍

Great video Thanks!

Great explanation

beautifully explained

Super, thank you

Very good explanation,

very useful thanks

Amazing video... But what is the important of bridge rectifier

Amazing ❤

Thanks for sharing

Thank you very much for providing Demo of Dimmer working ( firing angle display in lab), using quadrac like combo. Jussojuan surender singal

Very very good sir

Awesome 😎

Nice!!

Good one.

perfect❣

Subscribed.

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?

bro u anwserd the question i seeked after for many moon thank u

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.

Were you not using isolation when probing mains AC?

Thanks❤

: ) Thanks.

Perfect WOW

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.)

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!

Thank you

wuld those triac work on phase shifting sensors or inductive pick up coils pulse generators?

謝謝您！

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😊

what it makes my Dremel tool run not smooth as your motor and also make some noise ?

7:46 For what reason is the bridge rectifier placed in the circuit? And how do we calculate the components value?

Hello, does this work for 110 AC as well? Thank you for the informative video!

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?

Does the capacitor change the same way in AC that you explained. THE traditional charging and discharging happens in DC. Isn't it?

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?

Hi ! Is it possible to achive some sort of PWM with DC and a triac ?

Is this how soft start works on the motors on power tools like table saws work?

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.

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 )

Sir, how to make the timing fine?.,i have a dimmer here but it's too coarse .,pls advice me.thank you

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.

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?

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?

Does this method allow less then half the power to be transmitted?

What varies at output Current or voltage ??

again, one of the top content creators on RU-vid, you proved it this time too

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.?

Is there a way to attain a 100% duty cycle using this circuit? Thank you!

Can this circuit be used for 120v 300 watt rice cooker ?

tenes un diagrama de como agregar un soft start para motor ac monofasico?

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...

Does it really regulate voltage from 0 -220 v ac

This tutorial is quite overwhelming. Thank you for reverse engineering that common module. However, what really confuses me is the output of the oscilloscope. Why isn't the current chopped at the beginning of the sine wave?

These are also sold as "solid state speed controllers" I believe. Please correct me if I'm wrong.

Solar tip: 1.) My automatic DIY solar tracker 2 axis: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_Rs8CptQcDw.html. 2.) How to screw up the solar power consumption / balcony power plant to really save a lot of electricity costs: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eC2olbCBhh0.html. Avoiding grid purchases will shorten the payback period. With Dimmer + Solar PV, self-sufficiency can now increase to almost 95%. That's how easy it is to suppress expensive grid purchases. The electricity bill stops just like the electricity meter. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-D9Ss0RuqZG0.html Kettle: Without a dimmer, the 2500W - 600W PV system needs = 1900W, which you have to pay more for. If I turn the kettle down to 600W with a dimmer, then every PV system that is too weak can now supply each consumer independently and independently, because the 2500W kettle becomes a 600W kettle thanks to the dimmer. No magic, just physics. The prerequisite is that you have at least one small solar PV balcony power plant. You don't need an expensive battery. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-azDjqZpz77U.html The 2000W e-heater becomes a 500W e-heater via dimmer, which can run 12 hours a day free of charge via PV with me. The 4000W analog oven is also tamed. It is not the solar systems that have to grow, but the average consumption of the integrated device heaters simply has to drop by 75%. With the dimmer / voltage controller it has become so easy. I have already switched my entire household (2020) to 4x dimmers. Please have a look at my channel. 🌞 ........... Increase mini PV solar self-sufficiency (winter and camping): You can continuously regulate a boiler and other power-hungry consumers with the "5000W dimmer". Ebay €7. I run 4 dimmers in parallel on an 850W inverter. Kettle 2.2KW at 150W runs 12 hours a day, so the water is always hot. The room is also nicely heated. 2.5KW washing machine runs in parallel with dimmed to 400...600W and always reaches its 60°C, and also its 1400rpm... It doesn't matter to the washing machine whether it changes the washing temperature to 5min@2500W or 100% can be achieved free of charge via existing PV power in 20min@600W. The wash cycle lasts the same time dimmed and non-dimmed, 3Sth 10min. The iron ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--71oL7z1kMU.html , dishwasher ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8vnAkrS1x-s.html , oven , electric heater, ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QbLWDbJi6ew.html , waffle iron youtube.com /shorts/ofanZCdYEjA?feature=share , coffee machine, all internal heating is throttled with me. Lots of videos on my channel. The inverter stays cool and quiet and the MOSFETs + (battery packs) stay intact because extreme current peaks no longer reach the inverter. Now every Mini PV Inverter is enough to operate large devices. So, with the dimmer, all internal heaters/devices can be converted into base load devices that stay almost permanently ON, drawing very little current directly from the PV. With a wattmeter / energy cost meter you can then measure this perfectly in order to set the dimmer optimally. ........ Comments: "Great idea - despite studying electrical engineering, I didn't think of it myself ;-)" or "I installed it in our washing machine, great idea!" or "Glück Auf Christian, I'm a professional myself but I haven't figured that out yet. 👌 Greetings Mitch 💚" and many more... LG Christian 🌞 ........... "smart energy saving" , has made a meaningful reaction video to the dimmer: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-EHtJGiXAjZk.html . 🌞 ......... "Free Range", also made a meaningful reaction video, to the dimmer: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qzdRdBObtvY.html . 👍........ "Jens Kummerow TS", also made a meaningful reaction video for the dimmer: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fTY5jWvz5CY.html . 👌 ........... A little hint: Energy cannot be saved. So if I want to boil my water, I always have to use the same amount of energy for one liter. Christian's method relies on a longer period of time with less power in order to be able to use the power provided by the PV as efficiently as possible - so consumption peaks are intercepted. In the end, the energy consumption should even be (slightly) higher due to the interposition of the dimmer, but it doesn't matter, since more efficient coverage by the PV system and therefore better use of the self-generated energy .......... Here an "automatic PV excess control + remote controlled dimmer with heating element" / load management (consumption / heating rod follows PV excess ...): ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-IWp7Mi2FldM.html . ATON - Power to Heat: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wnVSaioJsjY.html . "Obermühle" solved this via PLC: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-iR30cDaf1Xk.html "Heating with excess PV 🌞Do your own heating rod control". 🌞......... More videos on my channel. LG Christian ........

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

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

Please show the full circuit with all components & values. Cheers

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.

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)?

👍👍👍

Why theres burning/flaming inside potensiometer when this circuit used with drill? Tx u sir 🙏

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

Is there any way to use 20K pot instead of 500K. Please let me know.

👍👍👍👍

Why didn't you speak about snubber circuit?

hello sir when working with high voltage why dont you use a differential probe so not to kill your scope

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.

As making hundreds PCB each year I can tell you that: october prices at PCBWAY is really more expensive than JLC !

Can we make triac using BT 169 SCR as reverse parallel connection with common Gate

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

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

Why schematic of AC induction motor speed control are so rare??

How to mitigate the annoying buzzing sound tho???

on that db3 has 40 pf in test :)