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Old July 29th 07, 07:38 AM posted to rec.radio.amateur.homebrew
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Default microwave oven power supply

This may be a daft question, but is Marketing name for the product
"Inverter" ?

Doing a quick search on eBay, several ovens pop up with this name, one
description was "Panasonic Inverter Microwave Oven 1100W" - looks like
a 110V product to me.

I have never heard of a 12 or 24v microwave oven, 1100W at 24v = 45
amps which seems excessive even as a load for a large truck.

Regards,

Mark

On Jul 25, 12:42 pm, "Jimmie D" wrote:
I picked up a couple of inverter powered microwave ovens at the goodwill and
I was wondering if these power suppies can be used wih tube amps and such.
Also would like schematic data if I could so I could see if I can modify
them for other voltages besides thosed they are designed.

Jimmie



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Old July 29th 07, 02:59 PM posted to rec.radio.amateur.homebrew
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Default microwave oven power supply


"MarkAren" wrote in message
ups.com...
This may be a daft question, but is Marketing name for the product
"Inverter" ?

Doing a quick search on eBay, several ovens pop up with this name, one
description was "Panasonic Inverter Microwave Oven 1100W" - looks like
a 110V product to me.

I have never heard of a 12 or 24v microwave oven, 1100W at 24v = 45
amps which seems excessive even as a load for a large truck.

Regards,

Mark
On Jul 25, 12:42 pm, "Jimmie D" wrote:
I picked up a couple of inverter powered microwave ovens at the goodwill
and
I was wondering if these power suppies can be used wih tube amps and
such.
Also would like schematic data if I could so I could see if I can modify
them for other voltages besides thosed they are designed.

Jimmie



Conventional microwaves control the power by ON/OFF cycling of
the oven. For example, 1/2 power might be 5 seconds on, 5 seconds off.
The inverter technology controls the actual klystron operating voltage
to set the power level, and the food is heated continously. I'd suspect
the variable power feature has horrendous artifacts on the supply
voltage making it completely unsuitable for use by hams.


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Old July 29th 07, 09:51 PM posted to rec.radio.amateur.homebrew
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First recorded activity by RadioBanter: Feb 2007
Posts: 287
Default microwave oven power supply


"Uncle Peter" wrote in message
news

"MarkAren" wrote in message
ups.com...
This may be a daft question, but is Marketing name for the product
"Inverter" ?

Doing a quick search on eBay, several ovens pop up with this name, one
description was "Panasonic Inverter Microwave Oven 1100W" - looks like
a 110V product to me.

I have never heard of a 12 or 24v microwave oven, 1100W at 24v = 45
amps which seems excessive even as a load for a large truck.

Regards,

Mark
On Jul 25, 12:42 pm, "Jimmie D" wrote:
I picked up a couple of inverter powered microwave ovens at the goodwill
and
I was wondering if these power suppies can be used wih tube amps and
such.
Also would like schematic data if I could so I could see if I can modify
them for other voltages besides thosed they are designed.

Jimmie



Conventional microwaves control the power by ON/OFF cycling of
the oven. For example, 1/2 power might be 5 seconds on, 5 seconds off.
The inverter technology controls the actual klystron operating voltage
to set the power level, and the food is heated continously. I'd suspect
the variable power feature has horrendous artifacts on the supply
voltage making it completely unsuitable for use by hams.


Uncle Peter has spoken so i guess i shouldjust give up on the idea.


Jimmie


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Old July 29th 07, 10:35 PM posted to rec.radio.amateur.homebrew
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First recorded activity by RadioBanter: Jul 2006
Posts: 189
Default microwave oven power supply


"Jimmie D" wrote in message
...

"Uncle Peter" wrote in message
news

"MarkAren" wrote in message
ups.com...
This may be a daft question, but is Marketing name for the product
"Inverter" ?

Doing a quick search on eBay, several ovens pop up with this name, one
description was "Panasonic Inverter Microwave Oven 1100W" - looks like
a 110V product to me.

I have never heard of a 12 or 24v microwave oven, 1100W at 24v = 45
amps which seems excessive even as a load for a large truck.

Regards,

Mark
On Jul 25, 12:42 pm, "Jimmie D" wrote:
I picked up a couple of inverter powered microwave ovens at the
goodwill and
I was wondering if these power suppies can be used wih tube amps and
such.
Also would like schematic data if I could so I could see if I can
modify
them for other voltages besides thosed they are designed.

Jimmie


Conventional microwaves control the power by ON/OFF cycling of
the oven. For example, 1/2 power might be 5 seconds on, 5 seconds off.
The inverter technology controls the actual klystron operating voltage
to set the power level, and the food is heated continously. I'd suspect
the variable power feature has horrendous artifacts on the supply
voltage making it completely unsuitable for use by hams.


Uncle Peter has spoken so i guess i shouldjust give up on the idea.


Jimmie


I offered a opinion on Usenet... You can take it for what is worth..

Pete


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Old July 29th 07, 11:20 PM posted to rec.radio.amateur.homebrew
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Default microwave oven power supply


"Jimmie D" wrote in message
...
Uncle Peter has spoken so i guess i shouldjust give up on the idea.



Jimmie


Why don't you try one and let us know? It might just need additional
filtering
if they are using some sort of pulse width control of the klystron duty
cycle.
I was just expressing an opinion. My kitchen microwave is a Panasonic
inverter type.

Pete




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Old July 30th 07, 02:57 AM posted to rec.radio.amateur.homebrew
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Default microwave oven power supply

Uncle Peter wrote:


if they are using some sort of pulse width control of the klystron duty
cycle.


Somehow I seem to remember an early commercial 'radio oven' that used
a klystron; can anyone confirm this?

I was just expressing an opinion. My kitchen microwave is a Panasonic
inverter type.


Please post photos of it together with make and model info; if you
feel frisky, photos of the interior and PCBs would also be helpful
together with a photo of the wiring-diagram label that is often
included.

Regards,

Michael
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Old July 30th 07, 05:24 AM posted to rec.radio.amateur.homebrew
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Default microwave oven power supply


"msg" wrote in message
...
Uncle Peter wrote:


Please post photos of it together with make and model info; if you
feel frisky, photos of the interior and PCBs would also be helpful
together with a photo of the wiring-diagram label that is often
included.

Regards,

Michael


When it croaks. My wife likes it in one piece for now. Magnetron,
not klystron... Typo.

Pete


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Old July 30th 07, 11:03 AM posted to rec.radio.amateur.homebrew
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Posts: 287
Default microwave oven power supply


"msg" wrote in message
...
Uncle Peter wrote:


if they are using some sort of pulse width control of the klystron duty
cycle.


Somehow I seem to remember an early commercial 'radio oven' that used
a klystron; can anyone confirm this?

I was just expressing an opinion. My kitchen microwave is a Panasonic
inverter type.


Please post photos of it together with make and model info; if you
feel frisky, photos of the interior and PCBs would also be helpful
together with a photo of the wiring-diagram label that is often
included.

Regards,

Michael


i thought i did post the model #. dont know what happened. will have to dig
it out again. Wife got a hold of them and gave one to the church and one
became our personal oven so i cant tear it apart. I have long since been
forbidden to do that unless it is really broken.

Jimmie


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Old July 29th 07, 09:49 PM posted to rec.radio.amateur.homebrew
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First recorded activity by RadioBanter: Feb 2007
Posts: 287
Default microwave oven power supply


"MarkAren" wrote in message
ups.com...
This may be a daft question, but is Marketing name for the product
"Inverter" ?

Doing a quick search on eBay, several ovens pop up with this name, one
description was "Panasonic Inverter Microwave Oven 1100W" - looks like
a 110V product to me.

I have never heard of a 12 or 24v microwave oven, 1100W at 24v = 45
amps which seems excessive even as a load for a large truck.

Regards,

Mark

yes, there are appaently 2 types, one is made to run off of 12 volts maybe
24 VDC and the other runs off of 120VAC.
I think the 120VAC initially converts it to 300VDC then aplies it to the
inverter circuit.. Still trying to find a schematic to verify. I would think
this technology could be a major help for amp builders allowing us to build
inexpensive power supplies and easily custom wind the inverter transformers.

Jimmie


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Old July 30th 07, 02:54 AM posted to rec.radio.amateur.homebrew
msg msg is offline
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Posts: 336
Default microwave oven power supply

Jimmie D wrote:

there are appaently 2 types, one is made to run off of 12 volts maybe
24 VDC and the other runs off of 120VAC.
I think the 120VAC initially converts it to 300VDC then aplies it to the
inverter circuit.. Still trying to find a schematic to verify. I would think
this technology could be a major help for amp builders allowing us to build
inexpensive power supplies and easily custom wind the inverter transformers.


Please dig out the ones you have and take photos, front and rear of the
entire unit and if you don't mind, disassemble and photograph and
components. I can host the photos if you wish (email them to me).
This would _really_ help in the evaluation until any of us find schematics.

Regards,

Michael
msg _at_ cybertheque _dot_ org


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