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Flyback MOT???

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pauleddy

Thu Aug 05 2010, 12:09AM

Registered Member #2909 Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145

Ok I was out junking and I found an microwave and decided to pry it open to get more caps, diodes and a MOT
And I found this. The oddest MOT I have seen I think itâ€™s a flyback it came out of a 1250watt Panasonic microwave. Has anyone seen one like this and know any good uses for it?
Here are some pics of it

Myke

Thu Aug 05 2010, 01:27AM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

These are the newer types of microwave HV supplies and have been used before by other members. Personally, I haven't found any so I haven't had a chance to fiddle with them. I think these can be used to draw arcs but the HFMOT (high frequency microwave oven transformer) heats up a lot since it wasn't made for doing this. They can be used as plate supplies for high power vacuum tube projects since you can rectify and filter the output.
Others have more experience with these though.

Adam Munich

Thu Aug 05 2010, 02:04AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Well i better start stocking up on REAL mots if they are going to start using these...

quicksilver

Thu Aug 05 2010, 06:41PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

I have had a few. I parted them out. They are standard solid state PS and have some very useful parts IF they are still functional.
The "flyback" has some use in a DIY redesign. The Lutz wire may have some use but the switching transistor(s) are expensive (depending upon design).
I would be extremely cautious about lighting it up. That's lethal current and exposed traces. It's certainly not as safe as a standard MOT.
I had someone who handled seriously dangerous current help me make sure I was doing the correct things when I plugged them in.. I asked whether It would be OK to draw an arc and was told they were not made for that and if I wanted to keep the parts; such an experiment would be a bad idea.
I went with using them for parts; there are too many things that can go wrong and I don't feel comfortable playing with those at my level of experience.

pauleddy

Thu Aug 05 2010, 11:54PM

Registered Member #2909 Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145

thanks for the advice i think i may do the same and part it out. so whats worth pulling out of this thing?

Adam Munich

Fri Aug 06 2010, 12:55AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

It would be interesting for you to push it to it's breaking point. I want to see an arc!

pauleddy

Fri Aug 06 2010, 02:45AM

Registered Member #2909 Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145

if i find anther one like it i might just take you up on that

radiotech

Fri Aug 06 2010, 05:51AM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

The metalurgy would be interesting. What is the weight of copper compared to a steel core mot. Also how much more aluminum is in that oven compared to an old type. And finally how heavy is the oven?

quicksilver

Fri Aug 06 2010, 02:42PM

Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679

pauleddy wrote ...

thanks for the advice i think i may do the same and part it out. so whats worth pulling out of this thing?

Pull the heat sinks and associated transistors. If you get lucky you'll get Toshiba GT60N321, which a expensive switching transistor, a 4th generation IGBT with great stats. The heat sinks themselves have great value for all sorts of things (ZVS drivers, etc) they are a good size and generally well designed, Diode / Rectifiers are high strength - just about everything is made to withstand fair current & voltage as per it's design, you've got a nice little coil there, in facts it's a close collection for a great flyback driver. {But if you can keep finding them; you could really be talking about good money in parts.}
There are also high wattage resistors, and some pretty fair capacitors as well. In terms of money / value there are things like IC's of a switching type chopper (self oscillating) such as the STR2105. These are actual money when purchased alone; they are hard to find & expensive. they also are VERY robust. they provide an integrated circuit but instead of handling 3v like a 555 they handle 45v & a full 2 amps or more. The larger chopper IC's and a heavy transistor set like the larger IGBT's could be around $100+ when bought at a discount place like DigiKey or Mouser.
The "flyback" itself have value as it can be re-wound and it's core is certainly useful. As it is - it's not made to jump into the higher voltage range of a CRT flyback as the power supply is simply a 2kv (or around there) 250ma supply. But the components can be used for many thing.
The Toshiba GT60N321 is a substantially expensive IGBT, but even the small components are chosen for strength.

They are easy to disassemble & have quite an investment in HV components. I don't have one in front of me but there are more components that are worth keeping (depending on design) than I mentioned. Just about everything on the board have value and they were made for HV use. It makes sense to keep it as separate parts.

pauleddy

Fri Aug 06 2010, 05:47PM

Registered Member #2909 Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145

!amazed your right it is a Toshiba GT60N321
larger chopper IC's ? which one is that
is it the 4 pin thing on the heat sink or the litte 4 pin ic on the board
thers anther small ic on the other side of the board it has allot of pins look like a pc chip
whould i be able to use this board as a driver? like just take out the the fly back an put a crt one on it.
@radio- its really light like less then half a pound the wire i think is just plane copper, the primary is braded magnetic wire, the oven itself is relatively lighter then normal microwaves

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