First question, as long as we dont attach power to the radiation thingy we arent at risk are we? ok now onto the good stuff, we rip out the transformer, not literally rip so dont have a cow 
, and on the 1 side it has 2 connection on the bottom winding and 1 on the top, on the other side is has 1 on top and 1 on bottom winding, what wires connect to where? we hooked it up with positive from outlet connected to 1 connection on top and on bottom, then the neg hooked up to the other conn on the bottom, probably wrong, and we coulda blown up his garage, and when touched they spark and arc blue,green,red, and orange between the 2 wires until they get stretched to about 3in. I just wanna know how this thing works and what wires go where?
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, and on the 1 side it has 2 connection on the bottom winding and 1 on the top, on the other side is has 1 on top and 1 on bottom winding, what wires connect to where? we hooked it up with positive from outlet connected to 1 connection on top and on bottom, then the neg hooked up to the other conn on the bottom, probably wrong, and we coulda blown up his garage, and when touched they spark and arc blue,green,red, and orange between the 2 wires until they get stretched to about 3in. I just wanna know how this thing works and what wires go where?Top View
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Banned
Joined 2002
Banned
Joined 2002
you guys have never seen this page? http://www.users.qwest.net/~ptaylor/Electronics/MOTpowersupply/MOTPSpage.html
he rewired it and added some caps and it works. why wouldnt it? it switches ac to dc 12v which is what car amps run off of. Just check it out
he rewired it and added some caps and it works. why wouldnt it? it switches ac to dc 12v which is what car amps run off of. Just check it out
What that fellow did will work fine. The high voltage secondary winding gets removed. and he winds a few heavy gauge insulated wire turns in the resultant empty core window with which to make about 12 volts AC at high current.
The high voltage winding is the one that has lots of turns of very fine wire. It is likely the upper winding and has one terminal only. The inner end of this winding is attached to the transformer core and gets grounded. You want to retain the original 120 volt primary winding without damaging it. That is the one with two terminals next to the bottom. For the rest follow the fellow's directions on that website.
There is a winding that is only about four or five turns of wire that usually has flying leads and not terminals. It was used to light the magnetron filament. That can be removed as you will not need it.
Be careful and do not plug in that transformer again until you remove the secondary winding. You could easily kill yourself with the 2000 volts at lethal current that it can produce as stock.
What you build should have a 15 amp fuse between the primary winding of this transformer and the power cord. Use the fuse and fuseholder from the microwave oven. Do not screw the transformer down to a wooden board. The transformer will get hot in use and could potentially start a fire if left unattended and plugged in.
The high voltage winding is the one that has lots of turns of very fine wire. It is likely the upper winding and has one terminal only. The inner end of this winding is attached to the transformer core and gets grounded. You want to retain the original 120 volt primary winding without damaging it. That is the one with two terminals next to the bottom. For the rest follow the fellow's directions on that website.
There is a winding that is only about four or five turns of wire that usually has flying leads and not terminals. It was used to light the magnetron filament. That can be removed as you will not need it.
Be careful and do not plug in that transformer again until you remove the secondary winding. You could easily kill yourself with the 2000 volts at lethal current that it can produce as stock.
What you build should have a 15 amp fuse between the primary winding of this transformer and the power cord. Use the fuse and fuseholder from the microwave oven. Do not screw the transformer down to a wooden board. The transformer will get hot in use and could potentially start a fire if left unattended and plugged in.
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Joined 2002
A Microwave Oven Transformer gives 3.5VAC for the magnetron filament and 2KV AC (Alternating Current) that is rectified to DC (Direct Current) to feed the magnetron anode. A transformer DOES NOT, i repeat DOES NOT work on dc, it will just melt. You can rewind the secondary to a fat Car batt charger or a well oversized amp ps tho but its not worth it.
The "radiation thingy" is called a Magnetron.
I suggest you buy a real car amp.
A MOT is great for Tesla Coils.
The "radiation thingy" is called a Magnetron.
I suggest you buy a real car amp.
A MOT is great for Tesla Coils.
Thanks EC8010,
I was about to say the same thing!
WordUpOnLCDs,
You would be much further ahead to use a home amp, rather than build a large 12V power supply. Don't forget you need heavy duty rectifiers and filter caps. A regulator would be nice. The cost just got close to a purpose built home amplifier.
You are lucky you didn't come to serious harm (like dead) with that transformer!
-Chris
I was about to say the same thing!
WordUpOnLCDs,
You would be much further ahead to use a home amp, rather than build a large 12V power supply. Don't forget you need heavy duty rectifiers and filter caps. A regulator would be nice. The cost just got close to a purpose built home amplifier.
You are lucky you didn't come to serious harm (like dead) with that transformer!
-Chris
EC8010 said:
The fan is to cool the magnetron NOT the transformer, and rewinding the transformer in this way would mean it's running far below it's rated wattage anyway.
But you should really make it a regulated supply, and not a crude rectifier/capacitor one.
Even better though, throw the car amp away and get a proper amp!.
Agreed, the fan is there primarily to cool the magnetron, but it also cools the transformer which (being cheap and nasty) has an undersized core and low primary inductance, forcing high magnetising current. Loading the secondary lightly still leaves that large magnetising current, which heats the transformer.
"Apache/2.0.55 (Win32) PHP/5.1.2 Server
Apache is suppossed to be run on linux not windows GESH!!
They make it so people run it thinking it is secure on a windows box and then get hacked like the rest.. "
Hmmm...........The default setting for Apache is port 80. Linux or not, port 80 open means you can be hacked.
Your Internet connection's IP address is uniquely associated with a "machine name" known as your Internet connection's "reverse DNS."
Any web site can easily retrieve the unique "machine name" whenever you visit. It may be used to uniquely identify you on the Internet. In that way it's like a "supercookie" over which you have no control. You can not disable, delete, or change it.
Physically segment all your other computers from this server and use a different tcp/ip addressing scheme behind at least a router/firewall to secure yourself somewhat.
Want to know what ports are vulnerable on your system?
Hook up to http://grc.com/
and navigate to ShieldsUP! down the page and run his probe.
Be prepared for some frightening conclusions about your vulnerabilities.
Using a Linux box does not guarantee IT security.
Regards
Apache is suppossed to be run on linux not windows GESH!!
They make it so people run it thinking it is secure on a windows box and then get hacked like the rest.. "
Hmmm...........The default setting for Apache is port 80. Linux or not, port 80 open means you can be hacked.
Your Internet connection's IP address is uniquely associated with a "machine name" known as your Internet connection's "reverse DNS."
Any web site can easily retrieve the unique "machine name" whenever you visit. It may be used to uniquely identify you on the Internet. In that way it's like a "supercookie" over which you have no control. You can not disable, delete, or change it.
Physically segment all your other computers from this server and use a different tcp/ip addressing scheme behind at least a router/firewall to secure yourself somewhat.
Want to know what ports are vulnerable on your system?
Hook up to http://grc.com/
and navigate to ShieldsUP! down the page and run his probe.
Be prepared for some frightening conclusions about your vulnerabilities.
Using a Linux box does not guarantee IT security.
Regards
EC8010 said:
A great deal depends on the particular transformer, but the design of microwave ovens provides very little cooling for the transformer, as it's mostly ducted through the magnetron and out through the cavity. I'd certainly have no worries about using the transformer without the fan.
And 'anatech', I still repair Sharp ovens, both in and out of warranty - plus other makes, but mainly Sharp.
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