They should force all kids across the world. To learn from this man. He is doing amazing things here. I learned more in a hour watching his videos. Than all of school.
I boiled one of the transformers in a pan and made a youtube video with that process (I wanted the core to expand a bit and the resin that holds the coils to soften). MOT s (Micro Oven Transformers) make this world a better place :D Very nicely done transformer conversion! Thank you for sharing!
2 thumbs up and 5 out of 5 stars for you! Great description and very nice demonstration. You have answered the question I've always had regarding turns in the top coil and effect of putting more turns.. Thank you
Thank you, soo much. You are an amazing engineer. I was watching you from USA. Good job. I got a bunch of those microwave transformers. I always believe there is something that can be done using them.
thanks for the video. I've watched dozens of videos on this particular subject and yours is the best that I've come across so far. Thank you very much.
We were often taught as small children to test electrical batteries such as the square ones by our tongues however when using bigger electronic devices i will say this isn’t the correct way. I kno someone who actually received a large sized jolt on there tongue from this and resulted in no taste for some food. Even some smells you wouldn’t be able to detect. Over time it has gotten better but i suggest making a simple light which can detect power. As we do not all have complex electrical detectors. This is my recommendation so always use caution. Also i have found its best to use a nice size rubberized shoe to protect one from things when working with high power such as electrical plugs. Hope this helps , voltmaster.
I worked in a transformer, choke and inductor making factory for a while. We made devices so that they didn't vibrate and make noise, to improve insulation performance, and to improve efficiency. Some of the final construction steps were to immerse the devices in a bath of varnish, in a vacuum chamber. This sucked the varnish between the core laminations, the bobbins, and all of the coil windings, when the vacuum was released. Then they were drained and baked in an oven to harden the varnish. A similar process is used worldwide, using other varnish or wax. The downside is that transformers treated in those ways are very difficult to dismantle nondestructively. We often had older transformers, made by many different manufacturers, sent in for reverse-engineering and rebuild. That could be done least destructively by immersing a device in solvent for a couple of days, and then its core could be dismantled. The first 'E' or 'T' (for either 'E-I' or 'C-T' laminations) of the transformer or choke core would be drifted out with a thin drift, and then the dismantling became progressively easier. Bobbins could then be unwound, measured and turns counted, before being cleaned and rebuilt. In the light of this, your destructive method is perhaps the easiest one to adopt, if a winding can be sacrificed.
My friend and I have been staring at a transformer for two months, trying to pluck up courage to saw into the weld. And now you come up with the [obvious when you see it] solution. Many thanks!
This is the most practical channel to have in your subscriptions. My brother from across the pond believes in the KISS theory " keep it simple stupid" but doesn't speak condescendingly. Allways a pleasure to get the missing or improved bits from him. He makes every day projects easier. He's worth more than you can give. Thank you Robert Murry Smith.
The KISS method is best for the home-built projects. It takes an industrial engineer and a large shop with many employees, fancy tools, plastic mouldings, metal presses, etc. to make it not simple. Those things end up at the local shops.
My old Weller soldering gun was essentially a miniature version...the secondary was a single turn of heavy copper wire. It had a separate winding for a small light. Countless uses for old microwave transformers. Great video! You probably saved a lot of headache for people repurposing these transformers.
Please be careful with those things! You of all people don't need to be told about with microwave Transformers, it only takes one time! Looks like you're having fun stay safe! 👍😆
I guess I am a little eccentric I like to stick my tongue on my mot gives a nice numbing effect on the front of my brain thanks for letting me know its dangerous now I guess I will have to go back to smoking crack
no indeed - I do take the appropriate precautions but the danger here is the heat - on the bare wire side you have 2 volts - that's no where near enough to do anything to you - the 240 volt side is isolated from me - this is much safer than the original transformer was
Hi Bob! Over the past few years, i have often stumbled on your videos, and always enjoyed them. But this one takes the cake. I was currently stumped by the EXACT problem that you explained here so nicely. In fact only a few hours ago, I rewarded a workshop mechanic with some prize money to suggest a way to remove the secondary, but he just said No, I have tried and tried, and never succeeded - they are built and sealed in the factory so tightly, it is impossible. I was planning something close to what you showed, and felt so happy for the encouragement! I have always felt that posting nice, informative videos on the net is like broadcasting seeds of help in the wind - you never know or imagine how much even a tiny bit of your kindness and effort can mean to some one! (Sorry for going on so long.) By the way I am a retired Civil Engineer, having the best time of my life, tinkering and making in my house which is more of a junkyard than a decent house! Thanks a lot for all your videos, and best wishes for every thing good in life (and beyond)!
Your program is very helpful I had seen others run loops to the transformers I didn't know it increased the power Very interesting thank you Joey Cotton Houston Texas
VERY WELL DONE, The explanation was "spot" on regarding the electrical theory. And the trick to removing the secondary coil wire is going to save me A LOT of time, Thanks!!!
Very nice work. I've done quite a few of these myself, I've got quite the box full of them now. What I do is, place it in a vice with the bottom of the "M" facing up, That's the part that's welded on. The welds are very shallow and I use an angle grinder to grind them off. The bottom section comes off then. Then I put it down on a workbench, with the side I removed facing down. I use pieces of wood, about 2"X2" and 6" long to tap down both sides of the wire windings, a few taps on one side and a few taps on the other, you can grease the metal a little bit to help it slide down. I generally remove the primary winding because I use the secondary winding in place and cut out the center section up to the winding and make electromagnets out of them. If you're going to make an electromagnet out of these (and they make excellent ones!) Then you want to cut out the center section so that you're left with a u-shape which is the best for a magnet.
Great video Robert but I wouldn't recommend using vice grips for holding the nail as you could melt the springs in the giver grips as well as the nail 😉
I want to tell you that if you apply mains to the high voltage winding you can then get 50v ac out of the old 250v winding without doing any taking to pieces. You should know that taking out the shunt core reduces the inductance and the mains winding then takes a lot of current and the transformer will get very hot even with no load.
Btw, if you build a spotwelder out this, then it's better to use a chromium copper alloy for the tips, as it will stick less to the welded parts. Cheers mate !
Hello Robert, i just found your video when i was searching for some other tricks with MOT's and found your method of getting rid of the secondary very helpful regarding my own experiences doing it different ways. But one point i wondered about is your way of counting the turns of your new secoundary winding. I think, what you call one turn are rather two of them, with the additional one being the third. I hope my english is not too bad so that it can be understood, what i mean. I would use rather 10 turns to determine the voltage per turn the transformer delivers. Best regards Martin
If you take the basic microwave transformer, and use 3 parallel microwave capacitors on the secondary wire (the other secondary wire in on the casing), and initiate an arc between two copper electrodes, you can get air to burn. Burning air is different than just a plasma arc.
nice presentation, just one comment: You have to add the external loop also, so when you say you have one turn, there are actually two turns ther, one of then inside the trafo and the other is the one that includes the load.
I keep a set of electrical nippers in the car, and when I see an appliance like that, I cut off the electrical cord and use it to make an extension, since it has a right-angle plug, that are useful for getting to the outlet behind the sofa. I also collect vacuum cleaners, and join the hoses, so I now have an 8m hose for the car. The rest is useful for radio antennas, etc.
@@ThinkingandTinkering exactly mate, so rewarding following your inputs you teach and do it well, this is why your so popular. nice workshop too mate, mine is tidy and organized now too. keep sharing
hi there question because you stepped down the input voltage you got a high amperage which is why it melts the nail. You had a reading of about 2.3 V. That means you could safely touch both wires at the same time correct as long as it wasn’t hot previously of course.
6:30 great tip! most use 1 turn since its seems logical, but 2 turns are in practice way better. Yesterday I converted my 800 transforemer from 1 turn to 2 turns, and its amazing - like 4-5x more power. ( i use a chinese 2000W(2$) AC Motor regulator, and i can melt nails when the Potentiometer is only at 20% power)
Love your smarts lol and when the unexpected happens lol I got a good laugh too it's good to learn new stuff or just look at it and wonder wow amazing always smile my brother cheers mate I'm from usa but knowledge is universal
The MOT I pulled out was wired backwards or something. The input coil was made of smaller wires and such and the output was the larger wires, so I ended up cutting the wrong one off
I’ve got a Panasonic CT55JW it’s working fine apart from it’s Display, and then this .. fantastic , At least I know it’s all good parts !! Apart from the display walloped lol
All ya gotta do is cut one of the loop ends off drive a chisel or wedge behind other end with a hammer and even a wooden wedge will work, and presto it comes right out. I've stripped literally thousands of transformers for scrap copper.
Spot on, I've a scrap piece of teak cut to shape which I use in the same fashion. Mouse Milk also works a treat if you're not in a hurry. Coat coils and let sit overnight.
you would work out the voltage by either measuring it or using the formula n1/v1 = n2/v2 where n1 is the number of turns on the primary, v1 is the input voltage, n2 is the number of turns on the secondary, and v2 is the number you are trying to calculate, output voltage. Once you have the output voltage, you can either find the rated wattage on a label or calculate it using p=iv where p is watts, i is current, and v is volts, and then to calculate the output current you can simply rearrange that equation into i=p/v and plug in your calculated wattage and output voltage to get your max possible output current
A rule of thumb for transformers is the power out is equal to power in (give or take a bit.) A rough figure for output current can be found by noting the mains voltage and current on the label of the microwave. A 220 volt, 5 amp microwave has a transformer rated at roughly (220 volts x 5 amps) or 1100 watts. If your output voltage from a new coil is (say) 10 volts, then the available current on the load side is (1100 watts / 10 volts) or 110 amps. If you plan on pushing a transformer to near its maximum ratings, (a) put a thermal cutout* in the mains circuit, and include a fan to provide cooling, or the transformer may overheat and burn out. *These are often included in the microwave oven, mounted on the magnetron cooling fins, and also sometimes on the outside of the cooking chamber.
6:50 i thought 1 turn is better since it has more amps, but as shown 2 turns is in practice is better :) 3:30 i came to the same conclusion , this way is the best when you have to do it multiple times i used a round steel rod for hammering the wires out, but square is better offcourse.
Yeah, I thought 1 turn would produce more amps as well. I guess it's because there's more efficient transfer of total power (Watts) when more windings on both sides share the same field. In other words, that 1 turn would produce more amps if it enjoyed the same efficiency of transferring power (from primary to secondary) as 2 turns.
@@charlesrichards5389 no , the explanation is that at 1 turn (~1volt) the voltage losses are too hight at the contact point which reduces the currentflow. 2 windings are 2x the voltage and solve that issue
HI THERE! How's it going my friend? I really liked this video!! I've been looking for a cheap welder and now I have one!!! Thanks buddy °° You're the best!
Thank you Mr. Murray-Smith. I enjoy the content, it is very educational. And your style of presentation is very engaging.
They should force all kids across the world. To learn from this man. He is doing amazing things here. I learned more in a hour watching his videos. Than all of school.
I boiled one of the transformers in a pan and made a youtube video with that process (I wanted the core to expand a bit and the resin that holds the coils to soften).
MOT s (Micro Oven Transformers) make this world a better place :D Very nicely done transformer conversion! Thank you for sharing!
cheers mate - and thanks for the hint - never tried that
Thats a good idea. I suggested putting it in the freezer since metals contract in the cold making them loose.
Thank you, sir, for demystifying the spot welder and many other things!
Stay safe!
2 thumbs up and 5 out of 5 stars for you! Great description and very nice demonstration.
You have answered the question I've always had regarding turns in the top coil and effect of putting more turns.. Thank you
Great job Professor Murray-Smith. Just the right amount of information to present to us, the TH-cam clients.
That was a clever demonstration to save the iron core while getting that coil out of the way. 👏
One of the best explanations of a transformer aswell as a demo. Brilliant. !!!!
Takes me back to the science lab at school many moons ago,you have the same passion as my science teacher,the passion is infectious!!!
Thank you, soo much.
You are an amazing engineer.
I was watching you from USA.
Good job. I got a bunch of those microwave transformers. I always believe there is something that can be done using them.
Don't get no better than this! Well done sir. And thank you. Am building a spot welder as we speak.
Brilliantly lucid Rob. Once again!
Looking forward to something on Fly back transformers.
I love the combination of hose clamp, boost cables and vise grips!
Your explanation of the transformer might be the best explanation of transformers I have experienced.
Wow, thanks mate
The things you can do with a micro transformer is amazing. Great vid as always. Such a wonderful man. I wish I had a friend like him.
I watched quite a few of these videos but for some reason i like the way he demonstrated and explained everything a lot.
When I hear "Do not try this at home"
I say "Don't tread on me"
Thank you for freeing up the information!
thanks for the video. I've watched dozens of videos on this particular subject and yours is the best that I've come across so far. Thank you very much.
More video gold. Thank you Robert. You make me feel mentally wealthy. You rock and thank you.
We were often taught as small children to test electrical batteries such as the square ones by our tongues however when using bigger electronic devices i will say this isn’t the correct way. I kno someone who actually received a large sized jolt on there tongue from this and resulted in no taste for some food. Even some smells you wouldn’t be able to detect. Over time it has gotten better but i suggest making a simple light which can detect power. As we do not all have complex electrical detectors. This is my recommendation so always use caution. Also i have found its best to use a nice size rubberized shoe to protect one from things when working with high power such as electrical plugs. Hope this helps , voltmaster.
5:38. Very pro-active of you Mr Smith. Makes us wonder if you haven't wrestled with a plug in past projects. lol.
I worked in a transformer, choke and inductor making factory for a while. We made devices so that they didn't vibrate and make noise, to improve insulation performance, and to improve efficiency. Some of the final construction steps were to immerse the devices in a bath of varnish, in a vacuum chamber. This sucked the varnish between the core laminations, the bobbins, and all of the coil windings, when the vacuum was released. Then they were drained and baked in an oven to harden the varnish. A similar process is used worldwide, using other varnish or wax.
The downside is that transformers treated in those ways are very difficult to dismantle nondestructively. We often had older transformers, made by many different manufacturers, sent in for reverse-engineering and rebuild. That could be done least destructively by immersing a device in solvent for a couple of days, and then its core could be dismantled. The first 'E' or 'T' (for either 'E-I' or 'C-T' laminations) of the transformer or choke core would be drifted out with a thin drift, and then the dismantling became progressively easier. Bobbins could then be unwound, measured and turns counted, before being cleaned and rebuilt.
In the light of this, your destructive method is perhaps the easiest one to adopt, if a winding can be sacrificed.
My friend and I have been staring at a transformer for two months, trying to pluck up courage to saw into the weld. And now you come up with the [obvious when you see it] solution. Many thanks!
Go ahead and saw that bead. Or use an angle grinder. You only have to go as deep as the bead. It can all be rewelded back together as well.
You have started the wheels in my head turning. The possibilities are endless.
This is the most practical channel to have in your subscriptions. My brother from across the pond believes in the KISS theory " keep it simple stupid" but doesn't speak condescendingly. Allways a pleasure to get the missing or improved bits from him. He makes every day projects easier. He's worth more than you can give. Thank you Robert Murry Smith.
The KISS method is best for the home-built projects. It takes an industrial engineer and a large shop with many employees, fancy tools, plastic mouldings, metal presses, etc. to make it not simple. Those things end up at the local shops.
My old Weller soldering gun was essentially a miniature version...the secondary was a single turn of heavy copper wire. It had a separate winding for a small light.
Countless uses for old microwave transformers.
Great video! You probably saved a lot of headache for people repurposing these transformers.
cheers mate - thanks for taking the time to write
Same !🙂
A really fine video. Useful info, to the point, and great demos. AAA+++
Well done. I've seen a few of these.
With your explanation I now understand. Thank you.
Peace
Please be careful with those things!
You of all people don't need to be told about with microwave Transformers, it only takes one time! Looks like you're having fun stay safe! 👍😆
I guess I am a little eccentric I like to stick my tongue on my mot gives a nice numbing effect on the front of my brain thanks for letting me know its dangerous now I guess I will have to go back to smoking crack
The process he's following makes them safer than before.
no indeed - I do take the appropriate precautions but the danger here is the heat - on the bare wire side you have 2 volts - that's no where near enough to do anything to you - the 240 volt side is isolated from me - this is much safer than the original transformer was
Hi Bob! Over the past few years, i have often stumbled on your videos, and always enjoyed them. But this one takes the cake. I was currently stumped by the EXACT problem that you explained here so nicely. In fact only a few hours ago, I rewarded a workshop mechanic with some prize money to suggest a way to remove the secondary, but he just said No, I have tried and tried, and never succeeded - they are built and sealed in the factory so tightly, it is impossible. I was planning something close to what you showed, and felt so happy for the encouragement! I have always felt that posting nice, informative videos on the net is like broadcasting seeds of help in the wind - you never know or imagine how much even a tiny bit of your kindness and effort can mean to some one! (Sorry for going on so long.) By the way I am a retired Civil Engineer, having the best time of my life, tinkering and making in my house which is more of a junkyard than a decent house! Thanks a lot for all your videos, and best wishes for every thing good in life (and beyond)!
Hiya mate, Thank you for taking the time to say that, all the best, Rob
Awesome demonstration as always.
Keep up the good work 👍
i am comfortably numbed,you surely got that physics into me like i never saw or heard before,thank you captain.
finally someone who can explain my scraps i ve taken from my old microwaves. subbed. keep it going!
Love all the projects that you come up with!
that was brilliant, thank you!
Nicely done! WAY easier than the last one I did.
lol - awesome mate
This is a great video! Thank you so much for the tips!! I have 4 of these mot's now. That will be much easier.
Your program is very helpful
I had seen others run loops to the transformers I didn't know it increased the power
Very interesting thank you
Joey Cotton
Houston Texas
VERY WELL DONE, The explanation was "spot" on regarding the electrical theory. And the trick to removing the secondary coil wire is going to save me A LOT of time, Thanks!!!
cheers mate
Very, very nice video! Great explanation! ❤
Creative video, thanks for sharing :)
Now this is the kind of stuff I like. Thumbs up!
awesome
@@ThinkingandTinkering You sir are a very inspiring and talented teacher.
Another very interesting video. Naturally images come to mind of all those microwaves I took to the tip in the past.
Thanks for the inspiration.
lol - cheers for the post mate
Very nice work. I've done quite a few of these myself, I've got quite the box full of them now. What I do is, place it in a vice with the bottom of the "M" facing up, That's the part that's welded on. The welds are very shallow and I use an angle grinder to grind them off. The bottom section comes off then. Then I put it down on a workbench, with the side I removed facing down. I use pieces of wood, about 2"X2" and 6" long to tap down both sides of the wire windings, a few taps on one side and a few taps on the other, you can grease the metal a little bit to help it slide down. I generally remove the primary winding because I use the secondary winding in place and cut out the center section up to the winding and make electromagnets out of them. If you're going to make an electromagnet out of these (and they make excellent ones!) Then you want to cut out the center section so that you're left with a u-shape which is the best for a magnet.
Very excellent, i do much with Microwave Transformers but never understud Like this time good explenation
Great video Robert but I wouldn't recommend using vice grips for holding the nail as you could melt the springs in the giver grips as well as the nail 😉
Thank you great work learning a lot of things always wanted to know.
Thanks Robert great stuff
very nice demo
I want to tell you that if you apply mains to the high voltage winding you can then get 50v ac out of the old 250v winding without doing any taking to pieces. You should know that taking out the shunt core reduces the inductance and the mains winding then takes a lot of current and the transformer will get very hot even with no load.
Thanks Robert!
Thank you very much learned so much from you and love your humor
Another excellent and informative video thanks.
glad you liked it mate - cheers
Btw, if you build a spotwelder out this, then it's better to use a chromium copper alloy for the tips, as it will stick less to the welded parts. Cheers mate !
Thumbs up as always Robert. Good stuff. The mad science Bob Ross of our times.
lol - awesome mate
FYI, there is a movement on TH-cam trying to get project videos that use MOT's banned, because they can be so dangerous, handled improperly.
Thanks for all the videos 😎
I would love to see what you could do with geodesic dome energy 🕸️
This is soo cool! I wish I had a dad like you
lol
Very good stuff!
Your channel is gold
Thanks again Robert
thank you mate
Very interesting video, thanks
This is sort of like a cooking show. Probably won't use the recipe, but I love watching!!!
Does it make you hungry?
Hello Robert,
i just found your video when i was searching for some other tricks with MOT's and found your method of getting rid of the secondary very helpful regarding my own experiences doing it different ways.
But one point i wondered about is your way of counting the turns of your new secoundary winding. I think, what you call one turn are rather two of them, with the additional one being the third.
I hope my english is not too bad so that it can be understood, what i mean.
I would use rather 10 turns to determine the voltage per turn the transformer delivers.
Best regards
Martin
GREAT STUFF !
That was definitely cool 😎
If you take the basic microwave transformer, and use 3 parallel microwave capacitors on the secondary wire (the other secondary wire in on the casing), and initiate an arc between two copper electrodes, you can get air to burn. Burning air is different than just a plasma arc.
Confused, how is it different?
you can also get water to explode
OK... you hooked me. Subscribed!
cheers mate - thanks
nice presentation, just one comment: You have to add the external loop also, so when you say you have one turn, there are actually two turns ther, one of then inside the trafo and the other is the one that includes the load.
I don't know who laughed harder, you or me, too funny
Tip: cut the sides off then put the transformer in the freezer overnight. Metal contracts when cold making them come out easier.
nice video thanks
The stuff of dreams.
Keep them coming!
dp
I keep a set of electrical nippers in the car, and when I see an appliance like that, I cut off the electrical cord and use it to make an extension, since it has a right-angle plug, that are useful for getting to the outlet behind the sofa.
I also collect vacuum cleaners, and join the hoses, so I now have an 8m hose for the car. The rest is useful for radio antennas, etc.
Congratulations, Robert.
Keep that good job going, because many will get richer in their knowledge
cheers mate
@@ThinkingandTinkering exactly mate, so rewarding following your inputs you teach and do it well, this is why your so popular. nice workshop too mate, mine is tidy and organized now too. keep sharing
Truly enjoy your videos. You are a wealth of knowledge Sir .
There's that laugh! Really making my day!
(Although I find it hard to believe that you did not expect that to happen... ;-)
lol - cheers for the post mate
I have a collection of microwave transformers. Nice!
Very cool and this I found to be an easy method for getting the secondary out - and I have tried a few ways lol
Great vid thanks from America west virginia
I love your videos. Please keep up the good work.
cheers mate
Don't forget the flash joule graphene !
The what?
❤❤❤ thanks mate
You're welcome 😊
So could you use multiple transformers to weld with and how would you do it?
hi there question because you stepped down the input voltage you got a high amperage which is why it melts the nail. You had a reading of about 2.3 V. That means you could safely touch both wires at the same time correct as long as it wasn’t hot previously of course.
6:30 great tip! most use 1 turn since its seems logical, but 2 turns are in practice way better.
Yesterday I converted my 800 transforemer from 1 turn to 2 turns, and its amazing - like 4-5x more power.
( i use a chinese 2000W(2$) AC Motor regulator, and i can melt nails when the Potentiometer is only at 20% power)
Love your smarts lol and when the unexpected happens lol I got a good laugh too it's good to learn new stuff or just look at it and wonder wow amazing always smile my brother cheers mate I'm from usa but knowledge is universal
These are killing people who try to use them in fractal wood burning
Really enjoy your topics interesting and educational, superb
cheers mate - thanks for posting
Very interesting!
glad you liked it mate - cheers
thanks robert
They make great fractal burners as well.
awesome
careful with that many people have died
It's low voltage but high amperage. Throw a clamp on the hot wire and meter the amperage when you spot weld.
Would it be possible to make a choke for a AC to DC conversion of a 120 amp MIG welder from one of these transformers using #8 wire?
The MOT I pulled out was wired backwards or something. The input coil was made of smaller wires and such and the output was the larger wires, so I ended up cutting the wrong one off
I’ve got a Panasonic CT55JW it’s working fine apart from it’s Display, and then this ..
fantastic ,
At least I know it’s all good parts !!
Apart from the display walloped lol
Good Idea for a heat resistant furnace.
All ya gotta do is cut one of the loop ends off drive a chisel or wedge behind other end with a hammer and even a wooden wedge will work, and presto it comes right out.
I've stripped literally thousands of transformers for scrap copper.
Spot on, I've a scrap piece of teak cut to shape which I use in the same fashion. Mouse Milk also works a treat if you're not in a hurry. Coat coils and let sit overnight.
Thanks for this. So it's inverse the lower the voltage the higher the current? How would I work out the current potential when stepping it down?
you would work out the voltage by either measuring it or using the formula n1/v1 = n2/v2 where n1 is the number of turns on the primary, v1 is the input voltage, n2 is the number of turns on the secondary, and v2 is the number you are trying to calculate, output voltage. Once you have the output voltage, you can either find the rated wattage on a label or calculate it using p=iv where p is watts, i is current, and v is volts, and then to calculate the output current you can simply rearrange that equation into i=p/v and plug in your calculated wattage and output voltage to get your max possible output current
A rule of thumb for transformers is the power out is equal to power in (give or take a bit.) A rough figure for output current can be found by noting the mains voltage and current on the label of the microwave. A 220 volt, 5 amp microwave has a transformer rated at roughly (220 volts x 5 amps) or 1100 watts. If your output voltage from a new coil is (say) 10 volts, then the available current on the load side is (1100 watts / 10 volts) or 110 amps. If you plan on pushing a transformer to near its maximum ratings, (a) put a thermal cutout* in the mains circuit, and include a fan to provide cooling, or the transformer may overheat and burn out.
*These are often included in the microwave oven, mounted on the magnetron cooling fins, and also sometimes on the outside of the cooking chamber.
6:50 i thought 1 turn is better since it has more amps, but as shown 2 turns is in practice is better :)
3:30 i came to the same conclusion , this way is the best when you have to do it multiple times
i used a round steel rod for hammering the wires out, but square is better offcourse.
Yeah, I thought 1 turn would produce more amps as well. I guess it's because there's more efficient transfer of total power (Watts) when more windings on both sides share the same field. In other words, that 1 turn would produce more amps if it enjoyed the same efficiency of transferring power (from primary to secondary) as 2 turns.
@@charlesrichards5389 no , the explanation is that at 1 turn (~1volt) the voltage losses are too hight at the contact point which reduces the currentflow. 2 windings are 2x the voltage and solve that issue
Fun, quick, to the point and as always really well spoken and researched - thanks!
HI THERE! How's it going my friend? I really liked this video!! I've been looking for a cheap welder and now I have one!!! Thanks buddy °° You're the best!
glad you liked it - cheers for the post
No problem my friend!! You're welcome!