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Author Topic: Useful ham parts in a microwave oven?  (Read 784 times)
KI6FOM
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Posts: 9




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« on: September 28, 2008, 11:18:10 PM »

Hello all,
I am retiring a working microwave oven due to rusted through places in the cooking chamber. Since I am a homebrew enthusiast I am wondering what parts would be useful to transfer to my junk box. Any suggestions?

Thanks
Don (KI6FOM)
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VK1OD
Member

Posts: 1697




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« Reply #1 on: September 29, 2008, 02:58:58 AM »


The power transformer is usable in a HV power supply for a valve amplifier, providing you remove the magnetic shunt and suitably isolate the grounded side of the HV secondary.

Two identical transformers are more useful.

Owen
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W8ZNX
Member

Posts: 1




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« Reply #2 on: September 29, 2008, 03:22:50 AM »

a bit
but

have you
spent any time working with high voltage

u know
simple mopa job
a bit of other tube job work

this is
one of those

if you need to ask

dit
dit
mac
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WA3SKN
Member

Posts: 5480




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« Reply #3 on: September 29, 2008, 04:26:10 AM »

How familiar are you with magnetrons and high voltage?
Otherwise, just keep the timer circuits and retire the rest.
73s.

-Mike.
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KA5N
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Posts: 4380




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« Reply #4 on: September 29, 2008, 07:55:18 AM »

I would keep the AC line cord.  

Allen
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KE4SKY
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« Reply #5 on: September 29, 2008, 09:39:43 AM »

Faraday cage for small FET devices
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K4JSR
Member

Posts: 513




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« Reply #6 on: September 29, 2008, 10:10:49 AM »

Mac, in this day of solid state most hams would believe that a MOPA is 4/5 of a Chrysler product! :-)

73,  Cal  K4JSR
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WA4DOU
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Posts: 436




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« Reply #7 on: September 29, 2008, 07:03:08 PM »

As I recall, I salvaged 6 or 8 680 pf doorknob capacitors
@ several kv. rating from the last one I junked. These are quite handy in antenna tuning networks and high voltage applications.
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NU7J
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Posts: 45




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« Reply #8 on: September 29, 2008, 09:18:55 PM »

I prefer to cook the ham whole, rather than cutting it into pieces.  Otherwise the ham gets dried out in the cooking process.  But if you've already cut the ham up into parts, you may as well remove all of the ham parts before disposing of the oven.  
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K4DPK
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Posts: 1077


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« Reply #9 on: September 29, 2008, 09:19:32 PM »

There are only about half the turns per volt needed on the power transformer windings to run without heating.  But you can use the 220 volt pri jobs on 110 vac and then use a voltage doubler to get up into the 2500-2700 vdc range.

The glass door makes a  great shielded window in the front panel of a large glass-tube amp e.g. 4-1000.

You can take the secondary windings off and either wind a filament transformer or run a one-turn loop of #4 through the core window and make a dandy spot welder for aluminum.

Phil C. Sr.
k4dpk

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VK1OD
Member

Posts: 1697




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« Reply #10 on: September 30, 2008, 01:43:40 PM »


Elmer said "There are only about half the turns per volt needed ..."

That was my reason for suggesting that two identical transformers are useful. Put the primaries in series, and parallel the secondaries. This will yield something around 1.0kV to 1.5kV DC, depending on load.

(Again, you must remove the magnetic shunt, and lift and insulate the grounded end of the secondary.)

Owen
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KI6FOM
Member

Posts: 9




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« Reply #11 on: October 01, 2008, 06:33:53 AM »

Thanks for all the suggestions. I do have experience working with high voltage so I'm definitely keeping the tranny. Probably won't bother with the magnetron though since I'm an HF experimenter and don't have any microwave test equipment.

Thanks again and 73
Don (ki6fom)
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