The problem with dimming AC LED Light Bulbs || DIY Trailing Edge Dimmer

$2 PCB Prototype & 24 Hours Lead Time: jlcpcb.com/
Previous video: • How to create the BEST...
AC Light Dimmer DIY or Buy video: • AC Light Dimmer || DIY...
Support me for more videos: / greatscott
Facebook: / greatscottlab
Twitter: / greatscottlab
EasyEDA project links: bit.ly/2WHUibn
bit.ly/2WMFM2b
More project information (schematic, code,.....) on Instructables: www.instructables.com/id/DIY-...
Parts list (incomplete, see Instructables for more, affiliate links):
Aliexpress:
1 x ATtiny85: s.click.aliexpress.com/e/_dSJ...
1x HI-Link 12V Power Supply: s.click.aliexpress.com/e/_Bfh...
1x 1206 Resistor kit: s.click.aliexpress.com/e/_dZ3...
1x 1206 Capacitor kit: s.click.aliexpress.com/e/_Bfg...
Ebay:
1 x ATtiny85: rover.ebay.com/rover/1/711-532...
1x HI-Link 12V Power Supply: rover.ebay.com/rover/1/711-532...
1x 1206 Resistor kit: rover.ebay.com/rover/1/711-532...
1x 1206 Capacitor kit: rover.ebay.com/rover/1/711-532...
In this video we will have a closer look at the electrical challenges AC LED light bulbs offer when it comes to dimming them. That means I will tell you a bit about how they are built and we will also determine the differences between leading edge and trailing edge dimmers. At the end I will then show you how to create a DIY trailing edge dimmer that you can even build at home for cheap. Let's get started!
Thanks to JLCPCB for sponsoring this video
Visit jlcpcb.com to get professional PCBs for low prices
Music:
2011 Lookalike by Bartlebeats

[@xuNsh1ne]

8:23 Only 2$ plus 20$ shipping

[@JoaoBarbosa1996]

That's on the Fast Shipping option, I think it's UPS or one of those. The cheap china post is like 5€-7€ but you have to wait a month

[@GRBtutorials]

Maverick PT Still better to make your own...

[@JoaoBarbosa1996]

@@GRBtutorials For 8€? I doubt that you can achieve the quality at home when compared to JLCPCB. If you can wait, it's the best option by far

[@GRBtutorials]

Maverick PT Well, it’s not like I’m going to use them for production. For one or two PCBs, it’s usually cheaper, because you don’t need 10 of them for prototypes, and it’s much faster, which allows you to advance in your project. Not to mention what happens if you screw up... That happened to GreatScott! once, and he gave up on the DIY or Buy!

[@JoaoBarbosa1996]

@@GRBtutorials In that you're correct but I like to have a proper PCB on my final versions of my projects. It brings the overall quality up. Different tools for different ends right? PS: You can order just 5

[@BoGifford]

Thank you so much for this video, I have been waiting so long for a comprehensive video on this subject. Keep up the great work!

[@art58wong]

Not many KZbin creators are worth subscribing but you are exceptional. The topics (at least to me) peak my interest and are well plus throughly explained. I always learn something practical. Keep inspiring.

[@MrTrollicus]

This video's iteration of "and I will see you next time" was the most striking one so far.

[@YagnikKhanpara374]

There's absolutely no need to hit that notification bell my friend because I always know that you always upload videos on Sunday... Every Sunday evening I open KZbin app and voila there is your video on top of my feed. Now I've no connections with electronic/electronics but man I like watching your videos. Love from India... Keep up your great work GreatScott

[@innovation4u336]

You are great teacher in the world. I always wait for your next video. Thanks sir.

[@guatagel2454]

The ATTiny dimmer is an interesting project on itself. Thank you!

[@oleenick]

I love that you are acheiving the same thing with a microcontroller and with discrete components. It's really interesting to see how to replicate a seemingly complex project with these discrete components.

[@westelaudio943]

Yes microcontrollers are overused

[@tobiasfellmann7692]

You make all this black magic in our daily life understandable. Thanks so much!

[@JonathanDeWitt1988]

Another great video Scott. This was an enjoyable watch. Thank you for showing a commercial version and your version.

[@olegvelichko1659]

Great Scott! Finally a useful ad! Downloading “my measures” right now! Hope it’s half as good and useful as this channel’s content... Thanks for these videos! Very interesting and easily understood tidbits of EE. With plenty of details.

[@l2largo]

Hey Scott! Can you show us how works a Vacuum Fluorescent Displays? VFD, its a little bit old technology but looks still awesome ;)

[@greatscottlab]

I can put it on my to do list.

[@timballam3675]

Here you go - kzbin.info/www/bejne/mZ24h3ivnsSMhK8

[@Zeddify]

I thought VFD meant Variable Frequency Drive. For 3 phase motors

[@logicawe]

Great Scott!! Another amazingly entertaining and educational video! Thank you for all the top notch quality content 😊

[@mmdnaderi7183]

OH MY GOD! Great video with a nice ending (and I will see you next time), such big information can't get into my brain, they are all useful, thanks!

[@virgogreg]

you go to so much effort in your videos, extremely professional and educational

[@raekmannen]

Beatifully made and informative video, as always!

[@JasonWho]

The video we’ve been waiting for! Thank you!

[@sang7873]

8:23 hahaha, when the shipping cost almost ten times than the product, very relatable.

[@ahmedelwan9129]

will try to do it at home and see the cost also if you order more you will pay same shipping ;)

[@HETRM]

yes but its comparitvely cheaper than going to china;)

[@maciekgucma4756]

Thanks again Scott! Its very inspiring for my lab! I'll show this to my students!

[@jonmayer]

Thank you for following up with this! Simply incredible!

[@lotfiboutebal233]

i always wait for his last moment expression " and i wiiiiill seeeee youuu next timmmme " ... your videos are such a help, though a bit advanced to understand.

[@sauravofficial3798]

After a long time . good to see you again

[@3DLearningResources]

Thanks , your videos are always inspiration for me and thats why i need a help in choosing original 18650 vs fake.

[@RabterPlaying]

Videovorschlag: DIY or BUY: Qi Charger (wireless charger)

[@Scott_C]

Would love to see this!!!

[@blockbertus]

Honestly, with the cheap prices of these chargers on eBay, Aliexpress, etc. it wouldn't be worth the hassle to get the windings just right. Not even considering the prices of the individual parts.

[@coolfirefelix]

Thanks GreatScott, I was researching on FL5150 and u made it.

[@youcefasb6293]

Me too, with ESP8266/32 will be perfect, no more ZC loop to care about

[@c7ndk]

@@youcefasb6293 Rolling average is easy to implement to filter out ZC

[@HETRM]

i always get to learn many things from your channel!!

[@MasEja]

This video answering my big question of RobotDyn AC dimmer stay flickering when setted up power in 5%. Thanks!

[@uniearesende]

"... and i will see you next time!" LOL! gets better every video.

[@nicewhenearnedrudemostlyel489]

like a commercial jingle. lol. wait...

[@guanglier]

Hi, nice video. Used a standard triac to dimm one 5W LED spot, never had issues with hold current.

[@MrNhojstrebor]

Das ist gut video, great explanation and illustration.

[@achalasamapriya2701]

very enlightening as always

[@virtual_ninja810]

I needed this video badly as I was trying this from your previous video ....and one thing I understood that I will stay from mains power

[@SurajGrewal]

If you're a maker, every maker has to go through a design that when connected to mains power, goes kaboom to become a real maker. It's like the coming of age for us.

[@rusulaoshadhapathirana1337]

Great video...learnt many things

[@marz4834]

This is the missing part of my project. Thanks great scott!!!

[@MCsCreations]

Pretty fantastic job, dude!!! 😃

[@yashveerthakur7265]

Your voice is so calming. Great work, Great scot!

[@electronic7979]

Very helpful video. I like it 👍

[@shivanandgk5379]

Lots of things learnt from you sir...

[@johnwhitmore2531]

The final circuit diagram has a connection from between the two N Channel MOSFETs to GND. That connection was not in the initial diagram at about 7:15 into the video. Does that circuit then not connect AC Live through the load to GND and AC Neutral straight to GND. Perhaps GND is not Earth which would imply Earth leakage and thus trip an RCD? I think that's how and RCD trips, if the current going into Live doesn't come out the Neutral it must be leaking to Earth and thus trips. I'm sure your circuit is probably correct, but why is it correct? Even if you're only connecting AC Live to the ground reference of your DC Circuit it still seems a bad idea? What am I missing?

[@Infinion]

It's outlined in the FL5150 datasheet on how the different configurations work. Mainly, GND is a floating reference for the FL5150 so it can do things like measure voltage drop across the MOSFETS to monitor current limits and siphon energy for itself from the AC line to charge itself with a DC bias to neutral. If neutral wasn't available, they would have to use chassis ground. Neutral is also used as the zero-crossing reference to monitor when to switch. This circuit only switches the hot line. It doesn't do any control with neutral besides monitoring the zero crossing. When Great Scott attached two terminal blocks to connect two neutrals, that is purely for convenience so that he doesn't need to use an in-line crimp connector or solder and heat shrink to connect the load's neutral connection to the neutral coming from a power socket.

[@americanrebel413]

Great video, thank you for sharing this.

[@rupantaradhikary1482]

Sir the video is realy nice and I realy enjoyed it So thanks for entertaning me

[@wei48221]

Awesome as always..

[@fastbike9845]

I built some dimming circuits following the ideas in here, it all works but getting it certified to install in an actual house is a different matter. I ended up building a low voltage control module to work with a certified 0-10v dimmer such as Finder 15.11

[@RomanoPRODUCTION]

Scott is very cool and a bit high voltage as well. 💥💥💥 💟

[@brainfornothing]

Very interesting ! Thanks for sharing !

[@boogeyman6114]

your amazing GREATSCOTT👍👌

[@tabaccopuro]

Amazing skills!

[@electronique_et_creation]

Great video, thank you.

[@DJlala78]

Very Nice, This raise some questions though : -Why is there two mosfets and not only one ? -Why is the 12V power supply so big and how is it done in the commercial version which appear to be compact ?

[@gdflanary2451]

Great video. Subscribed.

[@rasyaa_baka9377]

Wow it's amazing

[@merlinwilson5118]

great work

[@avejst]

Nice lesson Thanks for sharing :-)

[@warrengray610]

Hi Love your video, and I'm with you on that ( it's just arrived but I can't wait to build it scenario), I've been there myself! Anyway I recently made my own dimmer but what I did was recitfy mains, step it down and ,P.W.M. Via a 4029 counter ended up with single push button control flipflop direction every alternate button push illumination levels remaining when I remove input, also has a back up battery, BUT BEWARE OF CONTACT BOUNCE use MAXIM'S switch debounce IC. Kind regards Warren

[@CodeCatProgramming]

Incredible! JaguarTrials loves you Scott! Keep doing your thing and let us know if you need any Netflix or Hulu accounts for a giveaway to your subscribers!

[@pelletubbies]

Great video, thanks for putting together. I like the pens you're using. Do you mind letting us know which ones are in the video? Thanks!

[@volkhen0]

When I use filament light bulbs which doesnt have driver just capacitive dropper I always wire a switches to have one with capacitor which dims the bulb. It’s especially useful when you want to make a lamp that just lights like very old bulbs.

[@fuckthisksksjjksdfjd]

New if only I could purchase a commercial version of the high quality leading edge/trailing edge dimmer you made.

[@Makarand_Ronghe]

Stay creative and I will seeeeeeeeeeeeeeeee youuuuuuuuuuu nextttttt time❤️❤️❤️

[@DrexProjects]

Very nice . Thanks.

[@pmgodfrey]

This is why I still use incandescent bulbs. I have over a dozen dimmers in my home controlling upwards of 60 bulbs. Over 40 are in the basement alone on six different switches. I tried numerous brands of LEDs over the years and they all have different cutoff voltages. Some will dim great while others on the circuit go out entirely or are brighter than the others. Back in 2016, I bought over 1,800 60 Watt bulbs which should last over 20 years.

[@talesmaschio]

1800 bulbs? HAHAHA!! Awesome! How many do you still have today (march/23)?

[@pmgodfrey]

@@talesmaschio -- Probably only down 40 or 50 by now. Still have close to what started with. Was a really stupid idea. Basically I heard they were "gonna ban the bulb" and I freaked out and overbought. ¯\_(ツ)_/¯

[@talesmaschio]

@@pmgodfrey I don’t see it as a stupid ideia. What impressed me at first was how many you bought at once. Anyway, you made a decision based on info you had at the time. Also, LED lights used to be very high quality, today most manufacturers make cost oriented pieces of crap which main function is to quickly turn into electronic waste. Your incandescent bulbs may consume a bit more energy but they show a much nicer color temperature and impose zero harmonic distortion to the electric grid. So, you’re not that wrong.

[@pmgodfrey]

@@talesmaschio -- One of the biggest issues is how well they dim. Since most are built with low cost components, you can't expect much from a switch mode power supply, especially when they have such a wide operating voltage range. So they dim to a certain point and then some go out, others don't. Plus ones I've used in our rentals seem to be of horrible quality. They're they basic ones you find at any Home Depot. Might have just been a bad batch because I have had a few here and there that still work from 10 years ago.

[@juniorjunior7179]

Very good Congratulations. I am an electrician and one of the major problems I face when using dimmers with led lamps is when I turn on more than three lamps on the same circuit. For some unknown reason, grouping multiple light bulbs always causes unwanted flicker during dimming. Any ideas on what causes this problem?

[@Tritiumfusion]

Thank you, very nice

[@ivantregear3772]

A video on programming PIC microcontrollers would be awesome, especially as there's so little on KZbin. Thanks!

[@robjal]

Hi Ivan. Did you ever visit the JAL Website, see: justanotherlanguage.org/ ? I even made an Arduino like board so that you do not need a programmer to program it. See: www.instructables.com/id/JALPIC-One-Development-Board/

[@tariqsahi7052]

Which type of dimmer is more suitable and power efficient for inductive load such as fans? Also is it possible to drive single phase ac motor as energy saving dc inverter motor?

[@clkunde]

Excellent video! Thank you for share. I would like to know if you still using the IRF840 on the las PCB with de FL5150?

[@divanshudodeja2822]

I have a little doubt on the schematic front. How is the ground connected to the midpoint of both the MOSFETs? Won't it destroy the circuit as mains supply flow through that point.

[@rahulvc7791]

Thanks man

[@1kreature]

With a light sensor you can also measure how well a lamp (dimmed or otherwise is producing light... I use a s9067-01 from Hamamatsu with a bias supply and a resistor connected to my oscilloscope. Allows me to see the lux levels hitting sensor at high frequency to discover just how much of the light output is flickering and how much is smooth. Worst bulbs/led drivers I found has almost 100% flicker and not surprisingly the best have almost 0%. Most are unfortunately closer to the 100% range. Not fun if you are an epileptic.

[@villatuyo]

Hey scott i just create a drimmer, using two half brige IGBT and a variable duty cicle n555 arrangement, swiching at 5khz.

[@bledlbledlbledl]

I used to have a homemade dimmable AC LED LIGHT. It consisted of a simple inductor to limit the AC current, then a bridge, cap, and the LEDs themselves. It worked well, although it was a bit bulky. (Would still have it, except that I tripped and dropped it and it broke)

[@santoshbabu517]

Hi Scott very informative tutorial. Can you make a iot alexa dimmer control it will be very interesting and helpful

[@umardar9662]

loved it.❤💓🤘

[@DiamondAerials1997]

Would these circuits work well with an AC Fan? The only thing I’d probably need to add is a snubber circuit or replace the triac with a snubberless one

[@vidanatural_oficial]

the german guy have nice videos. .thank you.

[@yonutz333]

Great Video, as usual Scott is a pro. Can you please tell me why you have 2 series potentiometers on the last design?

[@JamesEggleston]

Great video as usual!! I was reading the FL5150 data sheet it says it can be controlled by a microprocessor with a logic signal, what exact type of signal would that be because I, couldn't get PWM to work as yet?? And I don't think that is what it means anyway.

[@LousyPainter]

Thanks! Won't be using JLCPCB though.

[@villatuyo]

Keep working hard on it

[@FARMAN68]

I really appreciate your hard work and dedication to serve your knowledge with rest parts of your country. Dear I'm struggling with research of reliable AC dimmers. How can I use these both pcb with esp32 + alexa/Google Assistant? Please reply if you're reading my comment.

[@gustavs845]

When you see the GreatScott intro: Ah shit, here we go again.

[@theoilfield1988]

Thanks alot. Super work, I failed many times and finally got it done after this video. I still dont understand why there are 2 MOSFET?? will it work with one? thank you

[@ahandlethatisnottaken]

It's AC so you need one for each direction.

[@sincerelyyours7538]

Interesting video! Will this circuit work as a speed controller for a universal AC/DC motor (such as a Dremel tool)? Thanks.

[@akira9ab]

Great project ! I just ordered the PCBs. Any idea what's the max power could be driven ? I have a 40W LED lamp. It is fine ?

[@TheFlyingKiwiNZ]

This is nice! Can you please show us how to make a LED dimmer controller that uses PWM not a potentiometer to control the dimming please?

[@FlowVirm]

hey greatscott can you test if a speaker crossover can make more voltage on the speaker outputs 12 v first begin slowely with 5 v to 12v

[@drdream123]

Love your videos.. but all examples show how to REPLACE an existing dimmer.. I can't replace mine.. what's the best way to convert from anti parallel scr to pwm?

[@enredao_electronico2737]

Interesting !! as usual . What about inductive loads like an AC FAN ? it would be Humming ?

[@hannandurrani963]

Thx GreatScott for guiding us about every electrical experiment Your Channel is the best. Like this comment if you agree peace

[@FriskRobotnik]

You are a beautiful mind! 🤘🏼 Is it possible to buy a smart dimmer that can have smart bulbs attached to it that will not cause flicker in let’s say a multi bulb chandelier?

[@lastnameavailableok]

very very good

[@partouelectric2353]

Hi Scott, Just to clarify I would be using your squair boartd with FL5150 chip Thanks you kindly Kazem

[@sinderw]

Hi, I wanted to know what is the point of using an optocoupler (U5) in the ATTiny version? The ground is common between the two sides and therefore the logic circuit is either riding on the neutral wire (not very safe) or on the live wire (well, not safe at all)

[@mukha521]

This worries me too. Mains goes to 12v circuit =\

[@grassrootfilms]

Thank god someone here is paying attention!! Everyone needs to read this!! This a terrible designed circuit! Use a photovoltaic MOSFET driver like a VOM1271T for the love of god. It will fully isolate the high from low voltage with no tie to GND. Also the MOSFET choice here is crappy. RDSOn of .85 ohms? At 60v, half the the waveform, you are expelling a lot of energy as heat! Also from Vishay, SUD80460E-GE3, something like RDSOn of .0447. That would be a lot better just to start!

[@Metaln00b]

Can you show us the dimming of ventilator motors (of few motor types)? Fits to the current season...

[@Allan-mf1he]

Nice thanks. How about adding up down push button design in you series of dimming AC LED bulbs?

[@recjack2816]

Hey Scott, what about the power factor? Can we design a dimmer with a circuit correcting the power factor and the distortion of the signal?

[@anthonyvolkman2338]

Very nice little ic for that use! How exactly does the Mosfet output stage not short to "ground"? The hit terminal would be shorted to ground every time the get turned on, right?

[@vragas5833]

Hey scott ! I'm watching ur videos. I want power wall and E-skating board PCB which brand will u recommend.

[@yttav5328]

Just try with a fan regulator and see the results. I hope you can dim your light accurately. And it will work.

[@pashajbl6159]

Nice video man 🙄 Cool