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4hv.org :: Forums :: General Science and Electronics
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"new" microwave

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Chip Fixes
Sat May 28 2011, 08:25PM Print
Chip Fixes Registered Member #3781 Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
So this is what my dad just brought home for me, complete with a dead bird. This will be my first time taking apart a microwave so is there anything I should make sure to grab/ pay special attention to?


1306614332 3781 FT0 Microwave

1306614332 3781 FT0 Microwave2
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Forty
Sat May 28 2011, 09:16PM
Forty Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
grab just about everything out of it. there's lot of nice switches near the door, the circuit board usually has some heavy duty relays and stuff. the fan can be useful for wire or as... a fan. then theres the obvious Hv transformer, capacitor, and diode. if it had a turntable to rotate food, that has a nice geared motor. all the misc connecting wire is usually pretty beefy.

edit: hell, you can even take the metal grid out of the door to use as a faraday cage
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Inducktion
Sat May 28 2011, 11:07PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Take the capacitor that's inside of it and take a hefty sized screwdriver across the terminals.
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Chip Fixes
Sat May 28 2011, 11:24PM
Chip Fixes Registered Member #3781 Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
ah it's all apart, cap wasn't charged, ive got all the nice bits laid out now. Looks like it's time for another project! The microwave came with schematics inside, I can post them if anyone wants.

The metal grid was the door so there was no getting that out, is the glass shielded at all or is it just glass?
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Arcstarter
Sun May 29 2011, 12:09AM
Arcstarter Registered Member #1225 Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Camp Badger wrote ...

ah it's all apart, cap wasn't charged, ive got all the nice bits laid out now. Looks like it's time for another project! The microwave came with schematics inside, I can post them if anyone wants.

The metal grid was the door so there was no getting that out, is the glass shielded at all or is it just glass?
It is almost surely just glass. Due to the inherent long wavelength of microwaves the screen provides all the shielding required for safety.
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Chip Fixes
Sun May 29 2011, 12:16AM
Chip Fixes Registered Member #3781 Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
that's what I thought, oh check out this giant MOT

1306628190 3781 FT116613 Mot
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Forty
Sun May 29 2011, 12:44AM
Forty Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
nice. be careful with that.
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Chip Fixes
Sun May 29 2011, 01:16AM
Chip Fixes Registered Member #3781 Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
would it be possible to make a plasma speaker out of the MOT as long as it didn't become saturated?
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Forty
Sun May 29 2011, 02:41AM
Forty Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
I kind of doubt it. your circuit would have to be super heavy duty, your electrodes would probably melt, but most importantly, plasma speakers usually require a high frequency, and those frequencies would turn your iron core transformer into a short lived induction space heater.
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Inducktion
Sun May 29 2011, 04:30AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Forty wrote ...

I kind of doubt it. your circuit would have to be super heavy duty, your electrodes would probably melt, but most importantly, plasma speakers usually require a high frequency, and those frequencies would turn your iron core transformer into a short lived induction space heater.

See, the idea behind plasma speakers is to make a drive signal that is effectively above human hearing. Then, you turn that signal off and on to music. That's how they work. Since MOTS run at low frequencies, 50-60 hz, you'd hear more humming than music, if any at all.
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