Topic by triumphman | last reply
Looking for a glass turntable for a GE stainless steel oven Model # JES 1142 SJ .Could you help withlocating this part as well as the cost?
Question by trinidaye | last reply
This is my Microwave Oven Transformer stack. It is currently current limited using a heater. There is approximately 10 36 watt 4' fluorescent tubes in a string around my garage that I am lighting with the MOT stack .My MOT stack contains 4 Microwave Oven Transformers connected with their outputs in series and their inputs in parallel. They are mounted on plastic cutting boards. I am using threaded rod to hold the layers in place while the PVC pipe covers the threaded rod and it also supports some of the weight. The output of this is approximately 8800VAC at 350mA The Input voltage is 240VAC Thanks for looking, Please comment and remember to rate if you like it! Just say if you want any pics of a certain thing, e.g. the MOT stack arcing to wood/metal etc. (I will try to get more pics of it arcing soon but it is hard to use a camera that has like a second delay before it takes the actual pic from when you press the button, stupid camera) ********************************************************************************************************** Edit The new pictures are of an arc between two carbon electrodes. The other pictures are of 12 fluorescent tubes connected in series but arranged in parallel so you can see them all
Topic by thermoelectric | last reply
I'm working on a microwave oven transformer based AC welder. Newer microwaves don't use classic steel and copper transformers but rather something much lighter with a few beefy electronics that look like transistors. My question is how does one manipulate these new-style electronic trasformers (if that's what they're called)? Imagine all the wonderful things one could to with such a light-weight but powerful circuit. Maybe it could run a laser, welder, or do voltage boosting for renewable electricity systems with long cable runs...
Question by snotty | last reply
I recently obtained a microwave oven inverter and I've been doing a lot of research trying to figure out how to power it. The microwave I found came with schematics and a decoder for the button membrane so I am able to operate the main control board and the MICOM board outside of the unit (with slight modifications) but I have yet to test the inverter in fear of blowing it up. Currently my question is can I build a 555 PWM to cheat the CPU or bypass it completely? if not then I suppose I could use the microwaves original circuitry to do so but I'd like to build a nice solid state tesla coil with it if possible. Instructables is being retarded and wont let me add notes to my pictures image one - Main control board to the left, MICOM control board in the middle, Iverter on the right image two - Slight modifications to power the board outside of the microwave image three - Used decoding chart to operate main circuit without button assembly image four and five - Showing the output of the MICOM board going to the CPU on the inverter and settings of Oscope (channel A)
Question by Jimmy Proton | last reply
OK, i just pulled this huge transformer out of a microwave today and was just wondering how on earth to hook it up. Pictures below. so please help. And sorry about the pictures being sideways. The bolts you see are on the bottom.
Question by budhaztm | last reply
I have a timer switch from an old dead microwave oven. Can I use it as the mains timer switch? If yes, how do I connect it. The timer looks exactly like what is shown in the following picture: http://hackadaycom.files.wordpress.com/2013/09/mads-microwave-teardown1.jpg (The picture was not taken by me. It is from an article on useful things that can be harvested from dead microwave oven.) Also, if possible, please mention the functions of various pins or give a link to an explanation.
Question by raftor | last reply
Question by Salty9 | last reply
Question by arnold54 | last reply
No visible mechanical buzzer. Seems to be one of the little boxes that is attached to the circuit board. I know nothing about electronics. Don't want to kill myself or ruin the microwave, but that damn buzzer is driving everybody crazy! Help!
Question by melnel | last reply
Question by georgene49 | last reply
Hello, I have a rewound MOT (230V input and 9-50V output, different custom windings) and I'm wondering why the transformer gets so hot when no load is even connected? Is it normal that MOT's get so hot quickly because the primary impedance is just so low? and how do they fix this problem when the MOT is still inside the microwave oven? Because there, it does need to be able to run for hours. I've read about ballasting the MOT, but I thought that was only for current limiting, when you Are attaching loads on the secondary? Greetings, Electorials
Question by DELETED_Electorials | last reply
I read TimAnderson's Instructable on building a homemade welder from microwave oven transformers, but that instructable is for a 110V setup, what should I change to make it work using 220V transformers on 220V. (I already gathered all the materials...)https://www.instructables.com/id/Build-a-Microwave-Transformer-Homemade-Welder/ ....Link to TimAnderson's homemade welder?
Question by inserbot | last reply
I opened up a microwave hoping for a microwave transformer. But instead i got this weird looking one. i was hoping someone may be able to identify it and tell me if i could use it for a tesla coil. also, there was no capacitor??!! the largest caps i could find were those three red ones in the pics. it apeared to have litz wire on the outside and normal wire wind on the inside. Numbers in it were - 97INV (im not sure if its a 1 or i) and F69144TOAP and finaly F607C. Update: ive now taken it apart, see picture. so, im guessing the litz wire was the primary (240v) and the solid wire is secondry (around 2kv). the secondry contained one really long winding and then another winding which only went around once (like in a normal mot). It looks like some sort of high current flyback. also, the secondary is also some kind of litz wire. It has many smaller hair thin enameled wires woven into a single strand. My guess it this thing operates at really high frequencies
Question by makincoolstuff | last reply
My microwave oven was out of order, it kept blowing up the power fuse; finally the trouble was traced to the power capacitor that was shorted. So, the power capacity was changed and the oven worked again, but now the magnetron becomes noisy with a jackhammer noise when it is working. This noise starts when the magnetron starts working, but it stops after some two minutes while it continues to work up to the time adjusted for it to finish its operation. What has happened to the magnetron? Is it possible to fix it? On the other hand, it is my best suspicion that it is the magnetron that is making the noise and not the transformer. What is your experience in this situation? This is exactly the sound (click on the link below) I am getting from my microwave oven, but it does not go and on until the machine turns off; the sound stops some two minutes into the operation, and the remaining time there is no longer the sound or noise – for the remaining time it keeps ‘quiet’ up to the completion of the time period it has been adjusted to operate, or I turn the switch knob to off. https://www.youtube.com/watch?v=CF0RXKF4puQ Thanks for any help or information.
Topic by Marius de Jess | last reply
Can I modify a Microwave Oven Transformer into high voltage? I had a MOT. secondary coil: 2kV output I heard some people in internet were modify the MOT into high current Can I modify the MOT Primary Coil into a few turns. Just like this formula : Vs/Vp = Ns/Np The original is : Vs/Vp = Ns/Np 2000/220 = 2000/220 In my imagine : 30 turns heavy primay New one : Vs/Vp = Ns/Np Vs/220 = 2000/30 Vs=14 666.6667 Can I do this?????????????????????
Question by james34602 | last reply
I have two microwave oven transformers (MOTs) that I am currently working on, and I have taken one of them apart to make sure of the wiring of the coils. I am fairly confident in the wiring of the whole system. I have the original primary and secondary coils, both made of copper. The transformer is one of the larger ones I have seen, and its wattage at about 1000W. I know it is not popping the breaker because the hum is always on. I have read through many of the instructables out there about MOT's, so I understand it pretty thoroughly, but the arcs on the instructables I've seen are several inches long, and my arcs are about half a millimeter. I really wouldn't call it an arc at all. I have the common wall output of 110 VAC, 60 Hz going into the primary coil, and the ground is attached to the MOT block itself. One of the secondary output wires is connected to a capacitor bank of 3 MOC's in series, and I have the other output on the end of a PVC pipe which I touch to the opposite end of the capacitor bank. What am I doing wrong?
Question by Technicolor | last reply
Hey guys I've seen around the net that it's fairly easy to make a spot welder from a micro wave transformer /micro oven transformer. So I was thinking if it's possibly to use the same idea to make a induction furnace? I would like to use it for melting/ casting aluminum (...and possibly metals with a higher melting point... if possible) any idea if it's possible.. and how to?
Question by lordl9999 | last reply
Hello, I'm busy with making a spot welder from a MOT (microwave oven transformer), but I'm not really sure why and how to ground the MOT. In the picture you can see that a wire from the high voltage coil is connected to the casing which I find to be Really odd. That wire is not really a problem since I'm going to remove the secondary windings, but I'm just interested in an answer to that. Another question is, is it necessary (for performance) to have the MOT grounded? or is it Only for safety that the casing needs to be grounded? (no matter what the answer is, I'm still going to ground it, so it's not necessary to have safety discussions here) thanks in advance, Electorials
Question by DELETED_Electorials | last reply
I just made a 3 phase MOT power supply and it's fun to play with (while being safe) but every time I use both phases it trips the breaker after only 2 arcs, sometimes it trips just from plugin it in, I am using a PFC cap on the mains side as well as a long extension cord, I have one of the transformers ballasted, and one of them has 3 MOC's in series on its output, the breaker can handle one of them just fine...for a little while. Is there any thing else I can do besides buying a bigger breaker switch? I'd say mine is 20A but i dont know for sure. Every time I draw arcs from my MOT it heats up really fast really hot, I am using the same setup as above , the only thing I can think of is to submerge it in oil but I dont want to do that because I'll want to make changes to it. What makes it different from a welding transformer in that they are made to draw arcs from but when you draw an arc from a MOT its a direct short and will eventually destroy the transformer?
Question by Jimmy Proton | last reply
Hi everyone,: I thought of something I could make for an Instructable. To keep the idea until I publish, I'll exclude the actual idea. I need a material for this project that will retain heat from a microwave oven for ≥20 to ≥30 minutes, Ideally Id like to keep the Temp around 180 degrees Fahrenheit. What can I use for this? We all know metal cant go in the microwave. Ideas??Thanks,Jari
Question by Jarib123 | last reply
Hi, I just found a MOT from a discarded microwave and was wondering if I rewound the secondary winding with a thicker wire (to get about 12V or whatever i need) would this be a good power supply for like an amp or other stuff (well it's a simple transformer (or is it?) i don't see why it wouldn't be, but before i mess with it i thought why not ask.) Also there was a sticker on teh microwave that said 700W and i wasn't sure if that is the power of the transformer or the Magnetron. Thanks in advance. Oh, and sorry bout me bad Engrish.
Question by T0C | last reply
I looked all over the internet and instructables on how to make a quad Microwave oven transformer stack but all i could find is a schematic and that is not enough. there are plenty of instructables on how to make a dual stack but none on a quad also could you show me how to add resonant capacitors
Question by crazy-blender | last reply
Hello, this is my first post here at Instructables. I will get straight to the point. I plan to build a diy spot welder. However, in most of the diy spot welder projects I have looked at, including Hack a Day and Instructables, a MOT (Microwave Oven Transformer) is used. The secondary is rewound with thicker wire, and the transformer is used to step down voltage and step up current. I have heard that these transformers can supply as much as a kiloamp at very low voltages. However, I do not own a MOT, they are too costly to buy, and I do not want to retrieve one from a microwave because- A) Nobody happens to be throwing away a microwave in my area. B)The guys who own the scrap metal and thrown away appliances will only give me a microwave oven at a hefty price. C)I would prefer to live a very long life, and do not want to gt myself electrocuted poking around the innards of a microwave. SO, I did a thorough search, and found that some people made a welder from a stereo amp transformer. Again, I did not own one, but what I did own was an ultrasound generator that was supposed to drive away rats. After making bloody inroads into it`s innards, I found a transformer quite a bit larger than the regular step downs. It is 5 cm long, 4 cm wide and 1.7 cm tall. Input voltage is 220 volt AC from the mains, at 60 hertz. Output is 12 volt AC at a maximum of 300 MA. Speaking from experience would anybody please tell me whether this is suitable for a spot welder? Please ask me for additional information, including pictures, if required. Thank you.
Topic by TheLightningConductor | last reply
Been watching a lot of videos on youtube about increasing the voltage on Microwave oven transformers!. what i cant undrstand is when people take out the secondry windings of the transformer & replace it with a few turns of 10 gauge wire to increase the power how does it work? as from what i've seen the 10 gauge wire still has the insulstion on it so how does the current cant get through to produce extra power?. Also what do the shunts do in the workings of the transformer?. can anyone explain this to me in laymans terms!. Thank's, Tezza1.
Question by tezza1 | last reply
Im going to try to keep this short. So a friend and I are both sophomores at our highschool and we are both in chemistry (which is a higher level science) and i built a coilgun for last years project and attempted to build a PWM driven one this year. My friend and I want to build a rather large coilgun using either 10 microwave oven caps or close to 40 or 50 caps from computer power supplies. What i need help on is whether we should use the microwave caps which are high voltage but low capacitance or the power supply caps which are 200 volts and around 500 micro farads. I also need help on what wire to use for my coil and how many turns for the coil. i would like help with a coil for each cap size. We are planning on using either a 3millimeter by 5 centimeter long steel rod or a quarter inch bolt. our goal is to at least shoot it through the wall of the physics classroom and maybe through the door of a car. anything helps. Thank you
Question by budhaztm | last reply
Ok, well I took apart 4 Microwave Ovens and I took the MOT and Capacitors. I already built the secondary with a 4" PVC pipe about 4 feet tall and I bought the primary (copper tube). I am using a fan from MO for my spark gap so it will rotate and cool at the same time. Want some advise on this build before i post it as an instructable. I read somewhere that I need to add something to block MOT's from sucking in too much current. Any help would be great. Thanks
Question by arenavles | last reply
I have bought two 75N06 MOSFET's rated a 75A that I am intending on using in an inverter circuit I will build the inverter will be powered with a 9v battery that will only trigger the MOSFET's that will lead to a modified microwave oven transformer and a car battery (65Amp). With the car battery I intend to draw about 200Amps from. At 50-60Hz the MOSFET's( I'm guessing) will be able to take that current but I am not sure if the pins will be able to handle that current the pins are only 0.34mm(0.01339Inches) by 0.6mm(0.0236Inches) thick so will it be able to handle 200Amps? If not could you suggest how to do this possibly with a few lesser current MOSFET's (lesser will equal a bit cheaper) in parallel? Thank you for any suggestions.
Question by The MadScientist | last reply
Hello, im trying to make a hv ciruit to ignite annoying fuel to air mixtures and require a capcitor in my circuit... which capcitor would work best? this one... http://cgi.ebay.ca/4-7uF-450V-HIGH-VOLTAGE-CAPACITOR-RADIAL-LEAD-X4-/230325359544?cmd=ViewItem&pt;=LH_DefaultDomain_2&hash;=item35a07613b8 or this one.... http://cgi.ebay.ca/1-05-uf-2100V-Microwave-Oven-High-Voltage-Capacitor-/270611299459?cmd=ViewItem&pt;=LH_DefaultDomain_0&hash;=item3f01b0bc83 if so, then why? thanks for your help i really appreciate it....
Question by isetmyselfonfirefollowinginstructables | last reply
I am working on an inverter that will be run off a car battery. It will use a ne556 timer to drive the 2n3055 transistors (50-60Hz) I will have in parallel leading to my centre tapped step up transformer which will be a modified microwave oven transformer. My car battery is a 12V 65Ah battery that I will intend to draw about 200Amps from, the car battery will only be run through the transistor and transformer part of the circuit, the driver I will run off a much lesser power source. Altogether I will be using 50 2n3055 transistors, two groups of 25 for either side of the transformer this will have a potential of 2875 Watts. How can I parallel these transistors to balance them to avoid cascade failure?
Question by The MadScientist | last reply
Hi, I have in my lab room thick tinted copper wire. I planned using them to make some electromagnet, but fail to find a solution on how to insulated them. At first I thought using those acrylic/enamel can spray, but I am not sure if it would fully insulated them. Would the acrylic/enamel penetrate between the contact gap and insulated them or will it just fail to do so? In fact, I am not even sure if it's a good idea to begin with, because I don't want to actually waste the copper. As an alternate option I thought using those magnet wire from the Microwave Oven transformer, the one with really thick diameter. I would uncoil them, and manually turn them. I thought I could use some of your advice. Actually, I dont mind if the process takes time, I am just looking a convenient way. Thanks Richard
Question by richardphat | last reply
I recently bought a cheap mig gasless mig welder and I was doing some online reading about it. So I found out a mig welder should be DC, with gasless having the clamp at + and the torch at - . However when I looked at the schematic (in the images) and inside the welder to confirm it, and it was AC. So it turned out really cheap welders are ac. So my I want to try mod it to be DC. My question was, what diodes should I use? What Capacitors and capacitance do I need? And how do I design a Choke? I was looking at getting this diode: http://www.ebay.com.au/itm/MBRP400100CT-400A-100V-SBD-Schottky-Barrier-Rectifier-Diode-Module-/160930207205?pt=AU_B_I_Electrical_Test_Equipment&hash;=item25783015e5&_uhb=1 And then putting two of them together to make a full wave bridge. Would a Schotty diode Work? Or do I need a stud diode? And about what capacitance do I need? Would lots of 2200uF 50v capacitors in parallel work? Could I put in a variable ballast? and where would it go, on the 240v side or the output? Lastly, could I also add a modded microwave oven transformer for low voltage high current in parallel to boost the power? I guess I would have to wind it to have a similar voltage. Thanks
Question by makincoolstuff | last reply