Recycle a microwave, BUILD A HIGH CURRENT 12 VOLT SOURCE

Recycle a microwave, BUILD A HIGH CURRENT 12 VOLT SOURCE


Thanks Stu for the idea, here is some info on my BRUTE FORCE POWER SUPPLY

1.5 VOLTS TO 15 VOLTS OUT AT OVER A 100 AMPS OF POWER, fully adjustable by a slide switch, of a special dimmer switch

Here is Stu’s video of his supply

IF YOU DON'T KNOW ANYTHING ABOUT THIS, DON'T EVEN THINK TO DO IT, OR USE ONE


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I built this from a old used microwave oven the first thing I did was open it up and found the Capacitor and the MOT (the transformer) it’s always near were the power cord comes into the oven.

THE FIRST THING TO DO IS SHORT OUT THE BIG CAPACITOR

http://img.en.china.cn/0/0,0,175,903...6,22dbdf33.jpg

DANGER THIS WILL KILL YOU IF YOU DON'T DISCHARGE IT



Discharging a high voltage capacitor

Discharging your microwave's capacitor is absolutely essential in preventing injury to your microwave, your tools, and

yourself. A capacitor stores large amounts of electricity even when your microwave is unplugged, and it must be discharged

A capacitor is discharged by creating a short circuit between each of the two capacitor terminals, and between each

terminal and the chassis. The chassis is the metal mounting (bare metal surface) of the capacitor. With your microwave unit

unplugged, touch the blade of a well insulated screwdriver to one terminal. Gently slide the screwdriver forward until it

reaches the other terminal, holding it there for a few seconds. Be aware that this often results in a loud and startling 'POP'.

Repeat this procedure in order to create a short circuit between each capacitor terminal and the chassis (bare metal

mounting plate surface). This same method can be applied to a capacitor having three, and not two, terminals.

Next pull out the MOT the oven should be a 1000 watt oven or a very old microwave the bigger the MOT THE BETTER it is

I destroyed three MOT’s before I got my first one to work


Here is a pic from another site of a MOT with part of its secondary cut off

http://tesladownunder.com/MOTremovedsec.jpg

I got that MOT pic from this site I THINK THEY ARE NUTS BUT HERE IS THE SITE I FOUND IT ON

http://tesladownunder.com/

http://tesladownunder.com/Tesla18Wee...3000_small.jpg



http://tesladownunder.com/Umb3145Animator.gif

My MOT with a new secondary made from #8 wire


http://i601.photobucket.com/albums/t...R/IMG_0014.jpg

http://i601.photobucket.com/albums/t...R/IMG_0016.jpg

http://i601.photobucket.com/albums/t...R/IMG_0017.jpg

I added my 300 amp diodes and there in a bridge ckt. with a 4000ufd cap to clean up the AC on the DC

http://i601.photobucket.com/albums/t...R/IMG_0032.jpg

on a side note here

i would wind the secondary with transformer winding wire, not pvc or braided insulated cable as the transformer will run so hot it will melt pvc insulation,

i have been there and wound my own and the iorn core itself gets real hot
so dont touch it

i have run my transformer from a 230v supply outputting 75amps easy @ 13.8v

but be aware if you have no way of adjusting the voltage the voltage will raise with no load connected and fall with heavy current drains so take this in to account when calculating the turns ratio for the secondary

Quote:

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Originally Posted by cully

on a side note here

i would wind the secondary with transformer winding wire, not pvc or braided insulated cable as the transformer will run so hot it will melt pvc insulation,

i have been there and wound my own and the iorn core itself gets real hot
so dont touch it

i have run my transformer from a 230v supply outputting 75amps easy @ 13.8v

but be aware if you have no way of adjusting the voltage the voltage will raise with no load connected and fall with heavy current drains so take this in to account when calculating the turns ratio for the secondary

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I'm using a magnetic low-voltage slide dimmer on one side of the primary it's rated @ 1000VA that is how I’m adjusting the voltage here is a link for the dimmer.

http://www.twacomm.com/catalog/Levit...5C58B00A76A100

I'm using #8 wire air craft wire plus a fan if i need it there free from the M.O. the MOT is from a 1000 watt unit I have about 20 MOTs here and only about a 1/3 are 1000 watt but I found a source to buy them brand new for a good price

I also have a 3000 foot roll of #10 wire Teflon coated for the military

What diodes did you use?

Gary

http://img.photobucket.com/albums/v1...o/transpic.jpg

well heres my transformer it has twin secondaries each 4mm solid core
each winding has its own 36MB100A bridge rectifier which is cooled by a computer chip heatsink and fan
the output is connected via the terminals at the top

http://img.photobucket.com/albums/v1.../transdraw.jpg

when i wound the secondary i measured the voltage after each wire turn till i got the desired voltage i set the voltage high about 15volts so under load it measured a voltage of around 14v
but if you are running a variable primary you will only need to set the voltage to a high range as the variable primary should be able to compensate
http://tbn1.google.com/images?q=tbn:...os/36MB20A.jpg

good luck

I don't plan on keeping my diodes near the xformer what is your bridge metal or plastic case what is the current rating?

I will try your dual secondary you may have a good idea worth a try

thanks Gary

each of my diode bridges are rated @ 35amp 100v thats why im using 2 parelleled they are plastic encapsulated modules

Quote:

---

Originally Posted by cully

each of my diode bridges are rated @ 35amp 100v thats why im using 2 parelleled they are plastic encapsulated modules

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KBPC8010 / 80A 1000V don't have any yet They are on the way, i'm using a 4000ufd cap what, what are you using to smooth out the AC

I like metal plus, i will be using thermal compound