Why RELAYs go BOOM!!! And How to Use Them
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- เผยแพร่เมื่อ 21 พ.ย. 2024
- You think you know how relays work until one blows in your face!!
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By: Mehdi Sadaghdar
I designed things with relays for decades. Far too much of what was in this video I had to learn the hard (smokey) way. Adding the zener diode was new to me though and is a brilliant simple solution when faster response is needed. Back in the day I used more costly solid state relays when I needed faster response. Could have saved buckets of $$$ using $0.10 zeners instead.
*For anyone confused by the above or just now hearing about "solid state relays" just know that is the really bad name the industry gives to large MOSFETs that are packaged like panel mount relays.
Hello colleagues electro engineers, me to as well.
@@Miata822 i got it
Why did you need such fast response times?
@@SirDella really fast blinkers
Brilliant. I know relays really well and have used them in lots of designs yet you still taught me something regarding the continuous arcing.
They're sponsoring you too?
@@Sparkette Why should relays sponsor him?
@@Power-Wiesel Brilliant
Same, I love relays from how unique they are, too bad I only have 1 in my home :(
One random thing I'll add is that they have a lower contact voltage rating for DC than AC,because there are no interruptions to the current that would let the arcing stop. A relay designed to switch 5A 120VAC might only be rated 30VDC, and might arc permanently and burn up when "switching" 80VDC 3A.
I am a Physics teacher, When a student out-thinks me I find that experience to be both exhilarating and anxious at the same time. It is wonderful to know that you and your daughter can experience that as well. Love your channel!
@hoiy vinosa i jealous you.😒
A similar thing happens in software engineering: Sometimes I will run a program with a known set of conditions to verify that the output is correct. Occasionally I will get what I think is an incorrect output only to discover while tracing the logic that the program is correct - my expected answer was wrong.
Actually, his daughter out-thinks him with monotonous regularity. It must be kinda depressing.
@@Tubluer And she plays the piano.
This guy will never die. He’ll just shock himself back to life.
Electroboom: * touches keyboard *
Keyboard: * sends a shock *
He's a bit of a professional idiot. He knows what he's doing so he can do this dangerous shit safely.
@@ZeldagigafanMatthew smartn’t
@@ZeldagigafanMatthew Doesn't mean he hasn't deadened his nerves. I'm a professional too... I once stood next to a panel holding a 18 gauge signal wire that was shocking me, all the while pondering how it had enough current to go through my PPE. I wasn't touching anything but the wire by the insulation, the current wouldn't have been able to flow any way but through me, my electrical boots, the rubber insulated mat, cement floor and finally to the ground. Still have no clue how the current for that particular signal wire was so high.
@@jeremyreese54 high frequency RF signals do not require a direct path to earth. Any large body acts as its own earth, as the AC signal is constantly charging and discharging the capacitance the body represents. The are a number of ways an active load could superimpose an AC signal, even on its DC supply, but such a condition would-be the result of bad design or very high power.
13:33 this is the most ElectroBoom-like edit ever
"Lets make an educational video about relays..."
4 min into the video: "I can make a taser out of this!"
We can make religion out of this.
That brought me back to school, where that is exactly what we did. That special pitch of the relay still makes me worried today.
@@-na-nomad6247 Mehdiism?
Michael Reeves has joined the chat
Michael Reeves is his nephew.
"I receive a shock"
Casually smiles as if it's a good thing
It inspires the science in us😁
So, yep its goood
NO! NO! NO! Many people say I am sick in the head. NOOOO!!!! I don't believe them. But there are so many people commenting this stuff on my videos, that I have 1% doubt. So I have to ask you right now: Do you think I am sick in the head? Thanks for helping, my dear ajf
@@AxxLAfriku lol wut?
@@AxxLAfriku bruh
every shock is more views XD
I like that at this point you are more scared by the breaker popping than messing with 2000V open circuits
For he is Mehdinvincible
2000V at no current... If it was at least 20mA, it would instantly kill him
@@aradmnk1269 Yes
@@themoonwolf7438 No current? It's a microwave transformer...
@@proxyhx2075 2000V applies no current man.. Otherwise this transformer would melt by a "current" as you speak
I am a technician and relays are very familiar to me, but listening you explain them was most entertaining. Pick up and release voltage I did not know of, to be honest, so I learned something today!
I'm an electrical engineer who did his concentration in power and had a dedicated class about protective relays. But even I learned a lot from this video! Keep up the great work Mehdi. I just wish I had a college professor like you
"Can you imagine being entertained by learning?"
Me watching ElectroBOOMs video: Yes, I can
Man I love this dude but now I fell asleep in the middle of the video xd
Yes. I now know a *LOT* of things that I will never, never, *NEVER* do. :grin:
LoL PRO
Electrobom, BigClive, lots of retro and modern computer tech channels, etc. I've learned more shit from youtube than actual science classes.
@@KeithOlson Shocking revelation, pal.
Can't remember how my teacher originally explained relays in introduction to DC nearly 20 years ago, but I cannot imagine it was this good. Well done 👏!
"A switch goes in series with the power line, not parallel." I remember having to explain that to my dad once.
If not, it becomes a fuse that only works once
@@TheEdRiAx I mean.... that is how fuses work XD
That reminds me of 8th-grade science class long ago, where during the chapter on electricity the students were told to connect a battery, a switch, and a light bulb, so that the switch would turn the bulb on and off. Several people had theirs hooked up so that the bulb was on when the switch was open, and off when the switch was closed. They ran their batteries down pretty quickly.
@@bledlbledlbledl And that's how a NOT gate works!
@@andreyrumming6842
There are fuses that can be reset.
"Soot" even the closed captions read 'suit' which made me laugh. Thank you for entertaining, electrobooming and educating us.
I heard there is a house dedicated to soot.
@@Skullair313 God rest Soothouse
Mehdi didn't say "suit", he said "soououoot".
It's really scaring me how fast this "Relay-Day" turned into an "I'll build a Taser-Day".
Again.
Somehow, building a relay using a freaking spoon is actually quite Brilliant. Yes. I went there.
Well hi😂
I guess you could say his demonstration was *relay* good.
XD
You, you, you... Your videos are very good.
Oh fuck! 🤣
But ur comment is not brilliant!
I'm an electronic engineer, trust me I learned a lot from this video... amazing work Mehdi!!!
I like how, even after having 2000 volts dropped on him, he still casually connects live wires to a spoon and touches it with his finger.
Notice whenever this happens he's not touching anything else with his other hand. He's also isolated from the floor. Would only feel a tingle (I've tried it)...!
I keep waiting for him to push the back side of the spoon :P
@justan idiot I believe the 2000v thing he's talking about was a while ago when he built a "Jacob's Ladder" using a microwave transformer. The device appeared to fall onto him while powered on and shocked him badly. I know he fakes shocks and other accidents to show potential mistakes you can make, but if that really happened the way it looked he's lucky to be alive. Those transformers can put out .5 A or more, they have enough voltage to force that through a human body, they can easily kill or burn tissue from the inside and they've claimed a number of lives.
@justan idiot true.
@@deltab9768 From what I remember from that video, the Jacob's ladder ended up shorting milliseconds before he touched it, probably what saved him. Then the fuse at the power outlet popped (or GFCI forgot what)
Mehdi, you are an international treasure! I've been watching your videos for so long and these educational videos are so well made. Keep it up my dude! Love your work.
Just found this channel...
Absolutely hilarious at the same time as presenting the important concepts in a memorable way.
My daughter did some electronics at college... It was unbearably dull... Till i told her how to make electrolytics explode... Then she went on a blowing things up crusade... Which was highly educational!?!?
Pure genius !!!!
Nothing more educational than putting 10 watts through a 1/4 watt resistor. You could even say it's... illuminating!
Ohms law, power law, discussions on thermal management and datasheet spects. Lots to be learned. An hour of intrigued lecturing, all stemming from a 4 cent resistor. Can't beat it.
“And the breaker pop”
*proceeds to clap*
😂
Thanks for the class about Relays Mehdi.
mehdi
that clap made me smile
Thank you for watching the video Abraham
@@kolegapsasasiadaodstronysz3569 thanks!
Shi h😂
8:39 i like this little arc in this transformer when he uses it, it's always there
Minimum current thru a relay contact is also known as "wetting current".
This is why you cannot use a 200A relay to reliably switch a low current circuit.
6:30 you can add a resistor. You can set resistor value to tailor the flyback voltage and release time.
this man is the only man that i know who keeps (most of) his mistakes in the video and somehow manages to make it funny
Pssst here is a "secret"...he is an electrical engineer. He does it on purpose. That are jokes. He knows what he is doing and what would become to dangerous.
@@JoshTyrReece except for the jacobs ladder
Mehdi: I received a shock! **smiles in happiness**
9:02 " My man-made relay"
*me looking at my 100% natural relay*
They call it evolution
I came here to the comments to say this, but you beat me to it!
Did you get your relay hanging from its tree like an apple or it grew to its toots, you know, like a potato?
well most relays nowadays are probably made by machines
@@MrKakaofreak just backwoords
Mehdi I’m on my third masters course and have even used relays in my work. I learned a lot about relays in this video that I hadn’t learned in school or at work. I’m very excited for your next video. You are awesome and I love your videos!!
10:50 Many relays do have a coil with a solid metal core, which means that a high frequency PWM can create Eddy's current heating up the coil's magnetic core.
2:46 This sounds like Turn Indicators in car... So I think Turn Indicators uses the same mechanism...❤❤❤🔥🔥🔥😍😍😍
@Ryder Wilson Yeah Bro...
Was designing a relay-related(sounds weird) circuit to drive my shift gear simulator right now and saw this video. Great thanks about mentioning the flyback diode! Nearly forgot about that. The rest of this video helps a lot too!
relayted
When the world needed him the most he returned and also I have physics test tomorrow let's see how it goes
Edit:- the test went well I got 43/50
Best of luck man 👍
All the best bro!! My best wishes are with you!! Do well!! ❤❤❤❤❤
Good luck Luigi
Good luck.
Good Luck buddy!
What made Michael Jordan a legend was consistently being great game after game. The same is true for ELECTROBOOM. Consistently great content. A true legend.
I was 100% sure for so long that you wrote Jackson, not Jordan
I would really like to see Mehdi’s setup for keeping himself alive at the bench, it can’t just all be down to repetitive exposure giving him better electricity resistance.
The happiness that he didn't get socked and the breaker worked at 9:18 is priceless
THANK YOU FOR THIS CONVENIENT TIME I'm studying for my finals and I'm having a nervous breakdown I almost cried THANKS AGAIN
good luck
@@dukati_erli8659 thank you
@Tomathy 🅥 not the time for ice cream man
@@CNoteZzz it's a bot
@@gopalkrishnan9732 oh that's ok
8:56 he blew the electrons away
Hello my friend, I have seen all the videos you publish, but I did not find a single video explaining how to reduce static voltage. Please put a video on how to reduce static voltage. Thank you
I have done many hobby projects with relays but I also learned a thing or two from this video - like release voltage and minimum operating voltage, etc. Thanks, Mehdi!
i sometimes dont understand what he says but i still watch cause I love The way he explains and demonstrates what he explains....!!!😂🤘
soot
“Dad why does the spoon taste funny?”
Süt 😁
There is no spoon
@ata yüksel I put cvm on it
Non-conductive spoons taste like burning.
Because I cooked heroin in it
4:08
a good ElectroBOOM video wouldn't be complete without some form of taser.
Thank you for this wonderful explanation.
My name is Fady , I'm from Lebanon.
I work in the field of electronics, but I always face problems in the multimeter. I want you to advise me how to choose the right multimeter !!
Thanks..😘
HORAY! YOU'RE BACK! also, whats going on with the "mould" effect! did you win!?!?!?!?!?!
Couldn't say it better! Glad to have you back Mehdi :)
It's amazing how I already know he's gonna get hurt before he touches something, this man is literally hurting himself so we can learn through evidence what not to do while messing with electricity, what a mad lad
This man is to electricity what Steve Irwin (RIP) was to crocodiles and other dangerous creatures 😅
No. The the electricity needs a path to hurt. And there needs to be a reasonably low contact resistance.
So if he is wearing rubber-soled shoes and does not touch anything else, the electricity does not have any path. And people with very thick skin on their fingers can also manage quite well because they have a high resistance in the skin.
But the whole idea with these videos is to make it look like fat zaps. And the best part? The fools that thinks he's a fool and do not understand what he's doing. Soo funny comment threads that may result from it.
@@perwestermark8920 if he were a fool, he would've already been dead. Didn't know that he dosen't really get hurt tho, but still what he does is amazing educational material
4:23 Damn! Took Me a while to wrap my head around that. Only when I looked at the relay terminals a few frames earlier, did I understand.
This was so cool!
Ye
I already knew a good amount about using relays, flyback clamping etc, but this still taught me even more about... certain failure modes. Always good to be aware of the various failure modes of components.
Honestly, it was nice watching Mehdi in this video! Your face showed how much he enjoyed making this one!
Just remembered how I created a similar "shocker" from the relay and the additional coil from the electric lighter when I was 10. Now I understand why I immediately liked this channel... and also why my finger twitches a bit randomly sometimes...
I remember making a "zapper" using a relay when I was around 10 or 11 -- the inductive kick can be rather significant. 😮😲😮
Only things I would add to cover in future are resistive vs inductive loads, and how to deal with hysteresis/debounce strategies for circuits sensitive to rapid transients.
I love relays! But I love solid state relays more.
How is your comment from 13 hours ago if the video came out 7 minutes ago?
@@jokubasvanagas3174 Patreon members get videos early
@@ScottsSynthStuff Oh ok
Solid State Relays are amazing. I have two of them controlling my attic fans from an ESP8266 chip
Maestro. This was the most incredible lesson about relays I have experience. 👌🏻🔥
I use a relay like the first black one you showed to make a ignition circuit for a ~1930’s 3hp engine on a railway inspection cart made to carry about 2 people. It was missing its ignition system except for the points, and a single spark wouldn’t ignite it, so it was set up like how it was set up in the video to buzz, except it operated a 6v car ignition coil to make high voltage.
This is how to do education on TH-cam! Bite sized, interesting, and actually useful. Thanks for all of the great content
8:03 Thats why slapping something fixes it
ᵒʳ ᵇʳᵉᵃᵏˢ ᶦᵗ ᵐᵒʳᵉ
11:52 Some trivia I learned: gold is used in electronic devices like computers and phones because it doesn't oxidize and those devices want to use as low a voltage as possible. (Voltages that wouldn't be able to break through the oxidized layer on, say, copper.)
Thank you for RELAYing this information in such a RELAYable fashion! I RELAY on you to impart this kind of knowledge, and I can now go and RELAYx!
😀
Yes Mr.Boom is very RELAYiable
To get rid of arcs in the contacts, you can put a capacitor over the contacts. I measured the voltage over my coil one day (it was a 5V relais) and when I disconnected my coil, the multimeter said 95V. Talk about a spike coming from such a tiny coil. And even when you're respecting the proper loads over the contacts, after several years, those contacts can literally burn away. Due to the current spikes, those contact points turn black after time, increasing the resistance while still switching the same current. This increases the power over the contacts making them even hotter when switching, turning them black even faster and faster until they burn away. I've seen many burned out relais and contactors over the years while troubleshooting our stacker cranes at work and the only things that are left, are the coil and the contact levers but no contact point anymore.
I never knew relays had so much to learn about them! Thanks for this!
12:25 You should tell us what is that awesome relay! 😎
1:50 I love it how his first reaction to seeing a flash of light is to squint back as if an electric shock was coming 🤣
I remember watching Mehdi when I was 16 and thinking I could never figured anything like this out now I'm 19 and he's one of the main people who inspired me to take an electrician class
That's pretty dope 👍
But to be fair, electrics aint all that hard.
Short, yet deep explanations on the how's and why of relays. Nice overview.
3:07 when mehdi finds a new pain, and he love it.....
Pain fetish 😳
Mehedi be like - EAU
@@bourbonbournvita tbf, he may be excited the fact that his vibranium skin has something he can test
@@bourbonbournvitaThe virgin "pain fetish 😳" VS the chad "masochist 🙄"
You know that it's a great day when ElectroBoom uploads videos.
Watching this man from 1 year still I am not bored
Good
At 10:00 you mention release voltage. Can you do a video about peak-hold driver circuits, like ones used for fuel injectors?
I am filled with joy every time I see a new video is out. You are exactly what the world needs right now I enjoy every moment of every video
love this part 6:13
True
*6:14
Feels like Dave got your attention with his Back EMF episode.
At university, the class where we would make industrial circuits just with relays and motors was definitely one of my favourite classes :)
It's always nice to search for relay videos, only to realise that your favourite electronics youtuber has already done a video on it. Thanks Mehdi
Why and how is this guy alive, i love it.
Yayyyy!
Mehdi uploads a video on my Birthday..
Feeling extra special now. :)
Happy birthday!
I commented before the video was published.
MAGIC
Time traveller!
Yeah, there is always that person asking why the comment is a day old!! PATREON ARMY!!
hacker man
I've discovered that relays give shock when powered off in the past by own experience. Same apply to solenoid valves and other similar stuff. Also, quite a crap of unreliable technology but still very widely used due to it's unique properties.
Relays are pretty reliable if used correctly.
Yes I got many times shicked
Never had one from a relay. Capacitors...
They can bite days after use, as i found out when i grabbed a used one from my compressor run/start capacitor spares parts box
I don't buy it. They can't stay charged like a capacitor can.
showed it to my father and he reacted with 'this is fake' and 'I knew that' until we hit the second half and he was hooked. as always a great video! we love your content and are looking forward to the next video
6:05 My laptop charger makes this sound when the laptop goes into sleep mode. This sound is loud enough to prevent me from easily going into sleep mode myself.
Thanks! Very enjoyable! I hoped there might be a mention about the relay ratings being for purely resistive loads. You have to derate them for driving inductive loads such as a solenoid. I hope that doesn't sound bad. I still get equipment to this day that I have to add arc suppressors to manually. Thanks again!
@@itsmoam Patreon i believe
@@itsmoam Patreon supporters get early access to videos.
@@itsmoam patreon early access
For real though, I really freaking like how he can be really fucking smart, and a chaotic dumbass in a flip of a switch, mix that with him forgetting some stuff that when he remembers looks obvious, an you have a amazing channel with crazy good videos
i learn more from this man than my whole entire years at school
Everytime he uploads, I’m happy to know that he still lives lol
Lmao
That's really true Bout styropyro
Even more so as styropyro only uploads like twice a year
steve1989 from MREinfo offers the same experience, every time a new video of him pops up, he survived severe food poisoning.
that's legit
I am a CS student...and I love your videos...very educational 🙏✨✨❤️
"I just didn't expect her to solve them faster than me"
Man, you're the only one who thought that
#justdadthings
"It is *guaranteed* to break through the oxidized layer" - then is clearly surprised when it works
@1:00 You welded it LMAO... You could possibly use Electro magnets to activate or deactivate this sort of switch also :-D
The diode is not necessary when MOSFET transistor is used to switch the relay/coil. I hope you omited this for the sake of clearness of your explanations. Briliant job!
Mehdi, I finally viewed your full video. Your analysis was very good. BTW, what's going in is a centrifugal half-loop lifting the chain. It's formed by stiffness plus an oriented pull vector, such as you running. And yes, the little snaps are real, but they _must_ average out since they are mid-chain. You won this, and the Royal Academy paper was flatly wrong. Thanks for standing up for yourself and not buckling to Big Names and lots of equations. Science needs more folks like you.
3:10 chinese boom
🤣
Patron represent!
I would have liked to see some of those maximum parameters tested. Push a thousand amps through that thing. BURN IT!!!
Bro he already did it
I came here again after electroboom said nobody watched this. I'm kind of a hero
The first part of this video is explaining how coil tattoo machines work, you should show them as an example of how relays are used in an artistic way. 😊
Today is the anniversary of me first finding you on youtube. From then till now I’ve loved your content. It’s funny and I always learn something. Keep it up man
5:38 RIP little Diode.
I'm in Class 10th and I studied the electricity chapter only with your channel
Thank You Sir 🙏
4:03 Mehdi's reaction when he gets shocked without predicting it coming.
I love that you get shocked all the time it cracks me up, just watch you don't give yourself a heart murmur
When did the university project, I wrote not only the good results but also the failures and how it is fixed. This guy does not make these mistake as a mistake, he wants to show them so you remember better. Of course if you put that diode yourself in wrong polarity you will never forget.
the was mehdi said interactive was quite interactive @ 13:05
Hey Electroboom where is your TH-cam play button we haven't seen it
12:06 "Hehehe Yeah Boy" 😂😂😂