Induction motor NVR switch and starting circuit

[@michelevitarelli]

The world is a better place with Matthias in it sharing his projects and videos.

[@hexadecimil]

Wow! I would have never thought to use the induced voltage from the starter windings to power a self latching relay. That's really smart.

[@kevinliang9502]

Can you explain this to a layman?

[@ToBeDefined85]

Yeah, i followed current for hot and neutral and thought: "How does the relay stay on?". Then i realized the spinning motor is inducing a current in the starter winding.

[@thewolfin]

It's not self-latching, but is in effect.

[@hexadecimil]

Keven, when we set up self latching relays back in my building automation days, we would use a double pole, double throw relay (like the one Methais has here, The relay has two poles meaning that it has two switches inside. It is double throw meaning that each switch inside is like a 3 way switch). In a latching relay you'd have some kind of device on one pole, on the normally open set of contacts, meaning that when the coil od the relay engaged, that device would run. Then you'd have a power supply rated for the coil on the other pole on the normal open contacts as well, which means that when the coil was engaged, that the relay would power itself! Hence the name self latching! The Only way to get the relay to disengage at this point would be to have some switch or button cutting the power to the relay. That's the first thing to understand. Second, (this may seem unrelated at first) when a iron core spins inside a coper coil, it induces a current inside that coper coil. This is how electric generators work. The inverse is also true. This is how electric motors work. Meaning that if you apply an electric current to the copper coil of an electric motor, that iron core inside starts to spin. (This is an overly simplifies explanation go how electric moters work but is good enough for now) BUT (and this is what I would have never realized if I were in Mathais's shoes) if you have a secondary coil arround the motor (in this case the starter windings) that coil has a current induced in it as long as the motor is running! And, again, in this case enough current to close the coil of the relay that Mathais happened to have on hand!!! This should be all the technical and specific information you'd need to under stand my comment. The info above is very basic and simplified to the point of being technecly wrong. Its very Mickey Mouse. But it may paint a clearer picture. The point is that Mathais is getting electricity back out of the moter while its running. If you want to understand the circut of any of these concepts better, just commenr me here and I'll be glad to explain more.

[@FliesLikeABrick]

I have used a couple motors like this - my preferred solution is to use a Functional Devices RIBU1C Enclosed Pilot Relay enclosed/modular relay -- they have 20 amp and other versions, $10-$20/ea. I connect the starter coil to the normally-closed relay, and have my main power switch for the device immdiately supply power to the relay. The 10-15 milliseconds it takes the relay to close, and a bit longer for the starter coil to de-energize -- ends up being plenty of time for the starter coil to kick the rotor in the right direction under light to moderate load. The form factor of this relay makes it attach natively to the side of any normal junction box, and wire up just with wire nuts. This eliminates the need for a second switch, where leaving it on by accident (or running the main without the starter) can lead to over-current draw, as the motor draws locked-rotor current. Makes the whole system idiot-proof.

[@DavidStanton]

Fascinating to watch you draw answers for just about anything from your wealth of knowledge. Hope you get through the next few months with your sanity intact.

[@mrdewilliams]

I absolutely love the way you share the whole thought process you go through when engineering a solution.

[@hernancoronel]

You are the closest thing to the mad scientist from the cartoons I have always wanted to be when I was watching cartoons in my youth. LOL! You are definitely my hero, thank you for sharing and keep up the great content!

[@Sea-Dog5496]

Hi Matthias. I have the same motor from a dish washer I hooked up as an 8" disk sander. After many tries to get it hooked up to run I settled on one normal on/off light switch, and two momentary push buttons. Along the lines of one of your examples. The light switch supplies the 120v to run and at the same time I push one of the momentary buttons for the direction. For my own sanity I labeled every thing on the face place how to turn it on. I had someone read the "how to" just make sure it made sense per the instruction. Works great.

[@super_slo]

His setup is simple, safe (once he addresses the contact spark) and genius, but i don't know if it would work for a machine that needs to run in both directions (as designed). I really appreciate the built in disconnect if the motor gets overloaded and stalls. Yours sounds pretty nice too, but I'd want to be aware of how it works and be ready to kill power if I stalled it.

[@Sea-Dog5496]

@@super_slo When I built my disk sander I went through almost all the ways Matthias has tried this one. The motor when it is in the Dishwasher machine, as Matthias says it all controlled by the machine. Most washers like this have a relay already, else where in the machine to take care of the start function. Some have a "start capacitor" to give the motor a kick to run up to rpm then drop out after run up. Some have a "run capacitor" that kick in at the start up and stay in until the motor is shut off and drop out after rpm runs down and motor stops. All Matthias did was move the sparking from him touching the wires together and then pull them apart after run up which caused the spark. If you look at the video the spark is occurs inside the relay in the clear plastic cover. The relay is rated to drop out at certain voltage. I see no spark at all on mine as I use the momentary button as a start capacitor (completely enclosed button so I become the relay). If I do not push the start button at all just flipping the switch would just make the motor hum. I have to push one of two buttons for CW or CCW for about 10 seconds and flip the main switch after pushing the direction button. This give the motor the extra kick to force rotation CW or CCW. I just wanted to make sure how I did my hook up is clear. Matthias's way works fine also.

[@super_slo]

@@Sea-Dog5496 when it's sitting there stalled and humming, have you watched the temperature rise? I'd be concerned about overheating with the motor energized but not spinning and thus not cooling. Like say a dust collector or something, might not notice immediately if it stops spinning, and not actually running the piece of equipment. But like I said, your setup sounds PERFECT for something being operated and needing both directions. Lathe, drill press? Either way, you both are awesome for actually building something with these motors!

[@Sea-Dog5496]

@@super_slo Hey Super SLo. If I turn mine on with the switch and no button pressed. It will hum only with no turning. So if it is not turning it is burning. If you leave it switched on no rotation it will burn up the motor winding. Of course it will take maybe 1, 2 or more minutes to burn. You will know it by the smell of wire getting to hot, and most likely smoke like crazy. However motors will tell you on the ID tag if it is thermally protected. It will blow a thermal fuse in side the motor to prevent fire. Older motors may not have this feature, so one must be weary. Point is you better stay focused on the task at hand and don't let your brain wonder off the track. Lol.

[@cbalan777]

I'm glad to hear your family is doing okay. ... I know almost nothing about how wiring works so I appreciate the effort that goes into making videos like these. All the drawings and explanations help me to understand it a little bit better.

[@andreask.8307]

Einfach immer wieder super, dass man sieht, was man alles mit ein bisschen Erfindergeist machen kann und damit auch Geld sparen kann. Kaufen kann fast jeder. Immer wieder schön, deine Videos anzuschauen.

[@thevtest]

Hello, Matthias, I enjoy your videos and I appreciate you writing the subtitles/closed captioning for your videos. In the mean time, would it be possible for you to turn the Auto Captioning when you post a video, up tuntil you upload your own captions? That would allow us that have a hearing impairment to enjoy your videos when they come out. Cheers

[@lwilton]

That's a nice clever way of getting around that problem. You might want to think about adding a cap across the relay contacts too. I was seeing quite a flash when the relay cut out.

[@forrestaddy9644]

I do enjoy you simple clever solutions to what can be perplexing problems. Using the reverse leg of the starter winding to seal/drop a start relay: elegant.

[@mikefricker3603]

Well, most of that went over my head but it was Matthias so I watched it! Stay well everyone.

[@greenatom]

Appreciate the closing comments. Videos of simple stuff are fun too, so I hope you don't stay away too much!

[@bobd.]

Glad to hear you're all safe Matthias. The virus hasn't not hit our area very hard either, only a handful of cases in the three counties around me. I like your ingenious conversion of the switches to momentary contact along with a latching relay to start the sander motor.

[@pettigrewwoodworks]

Good to hear you and your family are OK. Love to see your videos pop up but your safety comes first. Take care!

[@manuelpena3988]

Many of your short videos are the most interesting ones

[@Wordsnwood]

Great bit of engineering; love to see it all explained. Everyone is safe at home here also. Best wishes to Rachel for the next month!

[@chrisbarr1359]

I am always amazed by your intelligence and ingenuity! Take care!

[@alexfocus3474]

I still love your videos even though I would never be able to build as you do. I like how you expose your thinking as you work and how simple you make it look. Stay safe, we'll wait unless the c word gets us. Cheers

[@dataphool]

The sockets for those relays is an 8 pin octal socket (for vacuum tubes from 1930s-40s). The relays are Potter & Brumfield and can be found at many electronic suppliers. Good explanation.

[@CitizenAyellowblue]

Stay safe, and thanks for giving us a reason to stay indoors!

[@AsbestosCrisis]

Amazing work! Always so considerate in fully explaining your thoughts and technical processes.

[@ianvicedomini2648]

Electrical genius. Hope this virus doesn't get the better of you all Matthias. Take great care mate.

[@sajidrafique375]

I have a East German 'PRAZI' lathe which had a centrifugal starting switch which went bad after just a month ... I simply put my own momentary contact switch in front ...it has worked fine since for the last 28 years

[@1pcfred]

My mill had bad centrifugal switch contacts so I started it for years with a switch. Then one day I just fixed the centrifugal switch. Just had to bend the metal the contacts were on a little. They were misaligned.

[@paulstanding7267]

To you and your family and to all your subscribers stay safe we can and will miss your builds etc but your family comes first and a pre congratulations on your new arrival 😀😀👍🇬🇧🇬🇧

[@k13ehr]

Best wishes to you and your family Matt.

[@jamesoliver6625]

You need to buffer the relay. There was a lot of spark inside the relay when the coil was un-energized. Just sayin'

[@CraigsWorkshop]

Yeah - at some point those contacts are going to weld themselves shut - just when you want it least.

[@ilansch]

Yes I think you need to add back the capacitor.

[@Mbmoney1217]

It must be nice being this smart.

[@DoNaSbaR]

Also put a capacitor on the relay output terminals. There's a big spark in it! Nice project!

[@Scrogan]

Nice use of the starter winding, never seen that before. Though the relay looked to be arcing significantly, I’d chuck a MOV across it, if not another cap or two. And that relay? The thing looks ancient!

[@williamyoung3253]

We had a bench grinder at work that used a special start winding relay with a coil wired in series with the run winding. When the switch was closed the low impedance of the run winding at start up caused enough current to close the start winding, but after the rotor rpm increased, the decrease in current caused the start relay to open.

[@dandesjardins937]

We are fine, thanks for the update. Stay calm, don't panic.

[@sapelesteve]

Not that I understood any of it but that was a rather interesting video Matthias! Hoping that you & the rest of the family stay safe & sound............ 😉😉👍👍

[@SeanLeonDrumz]

Instead of using single pole rocker decora switches you could of bought single pole momentary push buttons for less than $5, but excellent ingenuity using the piece of lumber! Thanks for the upload.

[@matthiaswandel]

$5 US, plus two months to wait, plus shipping. Instead I bought light switches for $2 canadian.

[@billybobjoe198]

Household switches, at least in the US, are about $0.60.

[@SeanLeonDrumz]

@@billybobjoe198 not those nicer decora ones.

[@SeanLeonDrumz]

@@matthiaswandel If you are interested, send me a mailing address in a PM. I have a variety of push buttons I am willing to donate, also you said you don't have a replacement if that ice cube relay goes out i might have a few of those for you even some nice 240v ones.

[@billybobjoe198]

@@SeanLeonDrumz Nicer is debatable. I think decora switches are more about simplicty in face plates. Kind of like how FWD is more about simplicity of assembly. They just sell you another lie to get the public to like it.

[@usernamempk]

Good luck for new baby Wandel.

[@neodimium]

For a moment I thought I'm watching ElectroBoom!

[@mikecurtin9831]

Both good stuff. The difference is that Matthias doesn't pretend to be masochistic.

[@recklessroges]

full bridge pantorouter?

[@tfildaed]

Great idea! Stay safe and congratulations on new baby!

[@Tool-Meister]

There are commercial “dual” switches that have a spring-loaded start connection and a detented run position. In this switch design, the off button releases the start/run switch from the detent and it pops opentobteakthe contact. They are also available with two separate start/run switches for bidirectional motors. Your solution is likely way cheaper, but thought your watchers might like to know. Available at commercial electrical supply houses. Best of health and safety to you and yours!

[@matthiaswandel]

I didn't even come across a switch like that in my searches. Then again, I didn't search expensive sources at all.

[@zumbazumba1]

@@matthiaswandel Why not just use 3 position switch?1st position off 2nd with capacitor for start and 3rd one for normal work .You can start those motors by hand btw in ether direction by pushing belt up or down .All starter coil does is creating magnetic field to spin rotor in selected right or left motion -if you do it by hand or any other mean you dont need start coil.

[@glenpaul3606]

very good...it's nice understanding electrical circuits. a man of many talents !

[@eriqalenaya5943]

Thanks for your videos Matthias. Take care and be well.

[@brentfowler2317]

I enjoy your smaller woodworking projects. So it's just a thought but if you do anything smaller in your shop I know the shooting and editing takes a long time. But if your get a chance you make anything small I wouldn't mind watching shorter, smaller, projects as well. Just giving my opinion. Thanks for all the great video. Stay safe my friend.

[@spokehedz]

thumbs up for the wholesome update at the end.

[@cheewurz]

Always Amazed at your Problem Solving Skills, Matthias :)

[@woodsprout]

"Machine builds", cool ! I didn't know you had more machine ideas (plural) on your list. I love these, but I can wait. Take care, Matthias.

[@jbb5470]

Nice video and wishing good health for you and your family also!

[@mfsolutions]

Looking forward to seeing your shorter stuff! Stay healthy. All the best to you and the gang!

[@AirDave1]

Great implementation of start stop switch w/ ladder logic. Accolades for using the extra start winding for th relay- nice stall shut down. Now, wash ur hands, & stay 6 feet apart... 😁

[@aqueousone]

Glue a momentary switch to the ON side of the power switch. Both circuits energized while you push the on button and starter circuit disengages when you lift your finger.

[@zweg1321]

Good luck with the new baby

[@sidknowles1696]

Just look after the kids we will still be here when things are back to normal.

[@daily8150]

Totally.

[@Jgreb314]

For future reference and perhaps to aid your search, temporary switches are often referred to as momentary switches.

[@gregmislick1117]

Very nice solution - stay healthy! Make vids to save your sanity, beyond that your fans will wait

[@Alexander470815]

You could also rewind the relay to a much thicker wire. Then you can run the power to the main winding through it, if the motor isnt turning it is pulling that much current that in engages the relay. If the motor is up to speed and the current drops the relay will drop off an disengage the starter winding. For this Motor in particular your solution seems to be the best, but not all motors have seperate start windings.

[@jackdehaan2267]

Didn't understand much of the video - but I still enjoyed it!

[@magoocas]

If the situation here in Calgary is any indication, I think we know how the apocalypse is going to play out in Canada, orderly and politely.

[@scotttovey]

Unless you say there are only two genders.

[@thewolfin]

In interior BC, I've seen more smiles and cheerful people in the last 2 weeks than the last 5 months. Might be the sun though.

[@papounetpatenaude]

My wife's work was encouraged to close. She'll get unemployment benefits, to stay home. Paid, guilt free vacation. Makes me suspect people will wish for a pandemic every year. If they don't die of course.

[@atlas227428]

that was a very fascinating and educational video....thats so much for posting. stay well mathias!!

[@olivertrevellyan9789]

a good idea would be to use a latching button circuit with a relay, then hook the starter straight to the terminals of the switch itself and have the motor connected to the latching switch circuit. it will allow you to start the motor and keep it running without having constant power to the starter unit and also the benefit of only 1 button

[@evanchapmanfanman]

There is a type of relay for starting motors, it’s known as a potential relay and it works off the voltage of the start winding and will open once the motor is at about 80 percent, it works very similar to the mechanical setup you are using, however it’s completely automatic and self contained.

[@ghgodsexposed]

I've never understood electricity and I think I never will lol. But that's ok because we have smart people like you Matthias!

[@1pcfred]

There's not much to it really. If you can understand how water flows you should be able to manage electricity. Electrical work is a lot like plumbing. Just the stuff that comes out doesn't get you wet.

[@Ramog1000]

@@1pcfred but it makes your hair look funny

[@1pcfred]

@@Ramog1000 is that so? I've never noticed.

[@JamyRyals]

One of my favorite videos of yours! Terrific

[@mjb12141963]

So far so good in Canton, Ohio. Best wishes to everyone, everywhere.

[@tomnovak7731]

I was going to suggest the mod you did at 5:30. I'd be a bit scared to put info like this out there for the unsold electricians or there that don't know some of the dangers they're working with. But this was a get mod for the educated and courageous both. Lol.

[@jakeparr4532]

Peace be with you Matt and family

[@jochenmayer]

We enjoy the small stuff videos too. Stay safe

[@PNWPrototyping]

Interesting solution, for sure. I am a bit concerned that the relay is arcing inside every time you start it. I'm not sure how long that would last. Maybe another cap across some terminals will help.

[@mikecurtin9831]

Thanks much for the health update. Best wishes to you and yours.

[@greco37]

Appreciate the info on how to get the motor started. A latching relay circuit may be of some use here as well .

[@phgoil]

Handling loose live wires seems like a thing a woodworker wood do 😁😁

[@matthiaswandel]

An advantage of the north american system is its only 120 volts. It only hurts half as much when you get zapped.

[@phgoil]

@@matthiaswandel oh, that's true. Isn't it even 4 times as hurtful? Voltage goes quadratic into the power equation, so a doubling in Voltage would mean 4 times more power for the same resistance

[@charlc]

@@matthiaswandel Or that you're a qualified engineer and knows how to handle it.

[@phgoil]

@@charlc I am an electrical engineer in the making and my colleagues would condemn such handling of loose live wires as well

[@rickt151]

I have touched 240, I absolutely do not recommend it, it is painful, but anything more when it just goes through 1 or 2 fingers? Don't think so.

[@cjhoyle]

Great video, I had been looking forward to seeing this. By the way, the first link in the video description appears to be broken.

[@ltnthacker]

Thank you for the respite. Stay in touch, Stay healthy.

[@richardmugg2132]

Sweet. Always learn something here.

[@alec4672]

There's a way to take apart one of those switches and bend a spring to make it momentary. I've done it for garage door buttons to make them look integrated

[@CraigsWorkshop]

Good thinking

[@jbh.6257]

Got a video on it ?? :)

[@alec4672]

​@@jbh.6257 Here's the one I used sorry I'm years late 😂😂 basically you pop the paddle out and bend the fixed contact inside the switch down a bit so the moving contact never goes quite over center against the spring. kzbin.info/www/bejne/lYKtmIyAm7N-iKs

[@barthanes1]

Nice, elegant solution.

[@zer0b0t]

The relay still needs the capacitor. Also take into account if the relay gets stuck what would happen?

[@angelhdzdev]

Be safe!!! Greetings from Puerto Rico

[@ShopTherapy623]

thats really sweet! I wish I knew how to do this kind of thing. I've always been interested in electronics

[@CraigsWorkshop]

Just dive in. Take a look at course 6.002X (Not 802.11x!) available for free through MITx (or edX as it may now be called).

[@tollertollertoller]

@@CraigsWorkshop I looked at MITx and edX and neither identified a course 802.11x. Do you mind adding a link or additional directions? And thank you for taking the time to identify where we can learn this stuff. I was both fascinated and dumbfounded and you discussed it though it looked obvious from your drawings which make a huge difference.

[@CraigsWorkshop]

@@tollertollertoller My mistake - I'm remembering the number for wifi tech for some reason (apologies). It was 6.002X. Anant Agarwal is the course teacher, and it is a good course: courses.edx.org/courses/course-v1:MITx+6.002x_6x+1T2015/course/ I think you have to be logged in to see it, but it's a free account and they don't spam you/you can opt out of emails.

[@ShopTherapy623]

Craig's Workshop wow so cool! I’ll check it out. Is it an introductory course? I literally don’t know anything about electrical circuits

[@CraigsWorkshop]

@@ShopTherapy623 It might be a little tricky for a complete beginner, but there are lots of introductory courses around. That particular one is university level (It's basically a free university module).

[@MilesCallisto]

The temporary switches in that form factor are called “garbage disposal” switches. I’m not sure if any hardware stores in Canada carry them but Menards Home Improvement stores have them

[@matthiaswandel]

Wasn't aware of that. Never seen one for sale. Amazon would probalby have it too.

[@robertmurphy9498]

Very interesting. Iv only ever encountered industrial 3 phase motors with a start switch and run function like this. Though im no electronics wiz im curious to know if this is a similar type of motor

[@CraigsWorkshop]

Three phase motors don't need a temporary start circuit, which in a single phase motor is a false delayed phase generated by a cap or shaded pole. This is shown on Matthias' diagram as being 90 degrees out of phase. With three phase you have three true phases, each delayed 120 degrees from each other. So it's self-starting. What you will probably have seen a motor contactor, which is basically a large three pole magnetic relay, with latching emergency stop button, and often with over-current or over-temperature protection, perhaps reversing circuitry too.

[@robertmurphy9498]

@@CraigsWorkshop im not sure i just know it was on a 60 odd year old roller mill that was fed from a grain dryer on the farm where i worked. But i do know there was no emergency stop buttons on anything in there. Health and safety gave that place a miss and it was 20 years ago. You had to throw a lever switch, hold it in the start position till the motor spun up to speed and the flip it back to the run position.

[@cyborgsheep6077]

Its similar in that both are induction motors but the motor in the video can run off of standard 120v electricity in your house

[@CraigsWorkshop]

​@@robertmurphy9498 Could have been a twin-winding motor - one winding might have had more torque but lower RPM (more poles) - just for starting the motor up. Something like a Dahlander wound 2 speed motor. (Just an idea) Or - it could have been a single phase motor in a three phase environment. (Or something else entirely!) Cheers, Craig

[@dnngskn62]

Cool solution for the switch, take care up there.

[@rpicinic]

Be well and stay safe!

[@honeybadgerisme]

Cool. This is certainly helpful to learning electronic application! Thank You! & Congrats on the upcoming new baby!

[@mickdog2]

this is very interesting, great project

[@thomasloven]

Wait what? A third one? Congratulations!

[@jgurtz]

Ingenious solution, love it!

[@timfischer]

Matthias: "I can't find a cheap [momentary] switch online" Me: Searchs ebay, within seconds finds numerous ones for as cheap as 5/$5. Also me: (I refuse to say "temporary" switch. They are called "momentary" lol).

[@matthiaswandel]

Just searched again, nothing suitable for this. Mostly signal type switches, not rated for motor power.

[@karlfife]

@@matthiaswandel LEVITON 1256-W : 15A SPDT MOM CONT SWITCH. Commonly used for line voltage up/down control of blinds. This should work unless you need to discrete poles.

[@jobbe-wijnen]

That was one scary test circuit to watch ;-) great it works, i understad too little of motors to understand.

[@Tiger90Drake]

So nice of you not to insulate the connections of the relay

[@Dapstart]

nice indcution motor, i loved the video!

[@richardpatterson4312]

I have a 2 year degree in electrical construction and maintenance. Which means this switch system is exactly in my wheel house(however, now I do powerline work). I approve(not that you asked) of everything done here. I'm just questioning why I wouldn't have thought to do it. What was your childhood like? How did your parents encourage you? Stay sane and enjoy the family!

[@matthiaswandel]

I just played around with the stuff on my own. My parents didn't know that much about electricity.

[@BensHacks]

Super smart solution.

[@waynenocton]

Nice, so kind of an interrupting latching relay. Glad you showed it in use last video before this one. Very cool.

[@DenisLaventure]

Really clever solution!

[@Ejrupolsen]

Take care to you and your loved ones. 👍👍

[@tomdenny8507]

clever yet simple. Thanks.

[@1984SheepDog]

Did you include the capacitor in the circuit in the final version? I still saw sparks when everything was installed in the box

[@awldune]

The relay arcs inside the housing. See 4:10

[@MrJohnnyboyrebel]

Can you add a capacitor across the relay contacts to reduce the arcing? Unless the contacts are mercury wetted, and those types are relays normally aren’t wetted, you will probably have a smoked relay soon.

[@GigsTaggart]

@@MrJohnnyboyrebel yes he didn't have the capacitor in the right place to protect the relay. He should fix that.

[@henryD9363]

I'm worried that the inductive kick from turning the switch off would be more than 400 volts. That small capacitor is going to get charged up really fast because it has to absorb the considerable inductive energy in the magnetic field. Half microfarad capacitor would probably charge to a very high voltage to accommodate all the magnetic energy in the laminations of that motor. Very difficult to calculate. You would need a high voltage oscilloscope and actually measure the voltage Peak.

[@GigsTaggart]

@@henryD9363 Motors are measured in millihenry. Let's say 10 mh and 5 amps that gives you 0.12 joules and this motor probably isn't close to 10mh.

[@NinoM4sterChannel]

Brilliant idea, Matthias!

[@firstlast1661]

Grandparents should actually avoid watching the kids for their own safety, unless your kids are totally cut off from the world too. Unfortunate, but it is the typical recommendation in most places. (of course you may choose to follow current Canadian recommendations). Stay healthy.

[@noelnoel2898]

First Last..... idiot , go do some research on whats really happening with this scamdemic.

[@ismaeliso]

Hi Matthias I was thinking I should ask you the same question I asked @Jeremy Fielding , I think it would be awesome if you can come up with a respirator design out of old appliance motor and make it public..maybe we can all help our local medical facilities cope with their needs

[@joserubenscaramori8117]

Parabéns pela idéia!!!! Genial!!!!

[@olachus]

Some shrinking tubes on the relay terminal would be great for safety and to avoid any possible short-circuits in time.