Op amps problem Gain Calculation

[Peeler]

On Sun, 30 Dec 2018 14:43:25 +1100, cantankerous trolling geezer Rot Speed,
the auto-contradicting senile sociopath, blabbered, again:

Try microwaving an egg in its shell sometime.


Do it all the time, for ten seconds for one or two eggs to bring to room
temp from the fridge.

That's not cooking it.

It's still "microwaving" it, senile auto-contradictor!

--
Kerr-Mudd,John addressing senile Rot:
"Auto-contradictor Rod is back! (in the KF)"
MID: <XnsA97071CF43E3Fadmin127001@85.214.115.223>

 

[Peeler]

On Sun, 30 Dec 2018 16:05:52 +1100, cantankerous trolling geezer Rot Speed,
the auto-contradicting senile sociopath, blabbered, again:

But wouldn't be doing that to his eggs.

Spare everyone your senile "humour", senile Rot!

--
Norman Wells addressing senile Rot:
"Ah, the voice of scum speaks."
MID: <g4t0jtFrknaU1@mid.individual.net>

 

[William Gothberg]

I don't own a design company, I was asking WHY. FFS just answer the question.


On Sun, 30 Dec 2018 16:13:31 -0000, ..shadow, me & my <sha@ha.ha.br> wrote:

So Mr Mouth when will you have this product on the market and how
much will it cost??




"William Gothberg" <William_Gothberg@internet.co.is> wrote in message
newsp.zusv9ers7uplkq@desktop-ga2mpl8.lan...
: It was a question, not an answer.
:
:
: On Sat, 29 Dec 2018 19:38:34 -0000, ..shadow, me & my <sha@ha.ha.br
wrote:
:
: > So just aother mouth with no real answers...
: > are you lymeboi or bod's off spring?
:
:
:
: > "William Gothberg" <William_Gothberg@internet.co.is> wrote in message
: > newsp.zusotuud7uplkq@desktop-ga2mpl8.lan...
: > :I was just asking WHY. And people have already said that commercial
ones
: > are 2kW, so it's entirely possible.
: > :
: > : On Sat, 29 Dec 2018 17:19:48 -0000, ..shadow, me & my <sha@ha.ha.br
: > wrote:
: > :
: > : > So Mr Mouth when will you have this product on the market and how
: > : > much will it cost??
: > :
: > : > "William Gothberg" <William_Gothberg@internet.co.is> wrote in
message
: > : > newsp.zuslcnzv7uplkq@desktop-ga2mpl8.lan...
: > : > ::
: > : > : It can take 5 minutes to warm something from frozen to eating
: > temperature.
: > : > I see no reason that couldn't be made into 2 minutes.
: > :
: > :
:
:

 

[William Gothberg]

On Sun, 30 Dec 2018 03:09:29 -0000, FMurtz <haggisz@hotmail.com> wrote:

William Gothberg wrote:
On Sat, 29 Dec 2018 17:38:04 -0000, Clare Snyder <clare@snyder.on.ca
wrote:

On Sat, 29 Dec 2018 08:07:42 -0800, Bob F <bobnospam@gmail.com> wrote:

On 12/29/2018 6:37 AM, trader_4 wrote:
On Saturday, December 29, 2018 at 9:23:42 AM UTC-5, Bill Gill wrote:
On 12/29/2018 7:43 AM, William Gothberg wrote:
Shouldn't we have faster microwaves by now giving out a few kW? They
were invented decades ago.
Higher powered microwaves would require higher powered electric
outlets, probably 220VAC (in the USA).

Also it is questionable whether higher powered ovens would be
practical for use. Getting warming times down to a couple of
seconds might not be a good idea. More speed is not always better.

Bill

+1

That about covers it. Not sure how useful more power would be. For
example,
last night I was thawing out a tomato sauce in a quart plastic
container.
The Panasonic has a defrost mode that uses about 30% power and
cycles that.


It gets the 30% power by cycling the 100% power on 30% of the time.

(By the way, adjusting the level does not actually change the wattage.
It simply means the microwave will pulse on and off at its fixed wattage
until the desired level is reached.)

https://lifehacker.com/5974788/familiarize-yourself-with-your-microwaves-power-settings-to-make-microwave-cooking-a-joy

That was true of the first generation of Microwaves, but the current
"inverter" driver units actually CAN throttle the power. Inverter
microwaves are much better for defrosting AND cooking.

We've had ours for about 2 years now - replacing our original that we
bought in about 1985.

BIG difference (but the old one would likely still be working by the
time this one dies)

Why is it called an invertor? I thought an invertor was a device to
increase the voltage - like running 240V devices off a 12V car battery.

Why do you persist in posting waffle about which you know absolutely
nothing, twould be better to post on subjects you know or ask and
educate yourself about the other

I know what a fucking invertor is, I built my own solar panel system.

 

[William Gothberg]

On Sun, 30 Dec 2018 09:10:46 -0000, Andy Bennet <andyb@andy.com> wrote:

On 29/12/2018 18:21, % wrote:
On 2018-12-29 10:43 a.m., William Gothberg wrote:
On Sat, 29 Dec 2018 17:29:50 -0000, William <Gothberg> wrote:

On 2018-12-29 10:26 a.m., William Gothberg wrote:
On Sat, 29 Dec 2018 14:46:52 -0000, Andy Bennet <andyb@andy.com> wrote:

On 29/12/2018 13:43, William Gothberg wrote:
Shouldn't we have faster microwaves by now giving out a few kW? They
were invented decades ago.

High power microwaves (>1MW) are used in industry in for example ore
extraction/rock pulverizing.
1MW into a cup of water is not pretty, explodes the water contents and
breaks the cup.

I don't need a MW, but the usual 600W to 900W in domestic ovens is
pitiful. What's wrong with 2kW?

too expensive

You can get a 700W microwave for Ł30. Surely 2kW would be less than
triple that, so under Ł90.

and then re wire the house and when you use it ,
you can watch the hydro disk spin like a top

LOL. I have a 14.4kW electric boiler. That's what I call spin.

Spin? Does anyone still have those old mechanical meters? Mine just blinks an LED. If I were you I'd test it to see if it's charging you correctly, apparently they can go off calibration with age.

 

[William Gothberg]

On Sun, 30 Dec 2018 03:34:41 -0000, Bill Wright <wrightsaerials@f2s.com> wrote:

On 29/12/2018 17:26, William Gothberg wrote:


I don't need a MW, but the usual 600W to 900W in domestic ovens is
pitiful. What's wrong with 2kW?

I don't find much use for the 1,200W setting. The only real use is for
heating water quickly when the kettle's broken. Even jacket spuds are
cooked unevenly. Thick soup needs to be stirred during cooking. Meat is
hopeless.

I can't comment on the meat as I'm a vegetarian, but surely soup, once any part reaches boiling or near boiling, is going to bubble about and convect by moving the liquid about. When I cook soup, I just stir it when it's finished.

Anyway, for bigger things like a roast, what we need is a different frequency of microwaves that penetrates deeper. Must be possible.

 

[William Gothberg]

On Sun, 30 Dec 2018 10:21:46 -0000, Max Demian <max_demian@bigfoot.com> wrote:

On 30/12/2018 03:18, Bill Wright wrote:
On 29/12/2018 17:35, William Gothberg wrote:
On Sat, 29 Dec 2018 17:15:05 -0000, Bill Wright
wrightsaerials@f2s.com> wrote:

On 29/12/2018 16:27, William Gothberg wrote:

It can take 5 minutes to warm something from frozen to eating
temperature. I see no reason that couldn't be made into 2 minutes.

Conduction

Which would be way faster if the water content the microwaves were
hitting was heated hotter.

But the difference in temp between the outside and the inside of the
food would be greater and this could result in food that was both over-
and under-cooked. This is why microwave ovens have low settings, so food
can cook slowly and evenly. Anyone who uses a microwave a lot will be
well aware of this. For items where convection can assist conduction
higher power can be fine, but not for large solid lumps of food.

I can't say many things I cook have large solid lumps. All ready meals are pretty much fluid, so convection and conduction can take place, and almost everything I cook is a dish of something which is only 2 inches deep.

I don't know what the low settings are for. All the instructions I've
seen - e.g. on ready meals - say "full power". There is the defrost
setting, but microwaves aren't very good at defrosting as they don't
heat frozen water very well.

Mine thaws a frozen (already cooked) pizza extremely well, on full power. It turns a -20C pizza into a +40C pizza in 4 minutes.

 

[William Gothberg]

On Sun, 30 Dec 2018 17:00:35 -0000, trader_4 <trader4@optonline.net> wrote:

On Sunday, December 30, 2018 at 11:45:09 AM UTC-5, William Gothberg wrote:
I don't own a design company, I was asking WHY. FFS just answer the question.

And it's been answered, by many posters, many times now. All agree, but
you won't accept it. Much of what you post is just stupid, like not
understanding, or pretending not to understand, that with too much
power you will COOK parts of something
that you just want to DEFROST, because the heating is not even. Anyone
who has used a microwave to defrost things understands that.

Funny how I can defrost stuff on full power just fine.

As do the microwave oven manufacturers, that have defrost settings, that use low
power and even give that off time after about a minute and a half, so
that the food won't overheat and cook in areas. If you have a frozen
pork chop that you want to DEFROST, so you can brine it, marinate it,
grill it, etc., you want it DEFROSTED, not half cooked.

I don't microwave huge lumps of food like that. So, you could have a 2kW microwave where anyone cooking a roast could still turn it down to what they used to use, but if you want to heat soup, or defrost a pizza, you can use 2kW and get it done very quickly.

And the same
principle applies to things you want to cook. Because the heating is
not perfectly even, if you give it too much power, parts will be overcooked,
while other parts are not done.

Only if your food is more than twice as thick as the microwave penetration distance.

Even with today's ovens I use 70%
or less power many times just to reheat leftovers. Higher power, parts
start to spatter, overheat, cheese starts to separate into oil, etc.,
while other parts are still cold.

Doesn't happen to me at all. List some of the foods that go wrong when reheated on full power.

 

[Meanie]

On 12/30/2018 12:09 PM, William Gothberg wrote:

On Sun, 30 Dec 2018 03:09:29 -0000, FMurtz <haggisz@hotmail.com> wrote:

William Gothberg wrote:
On Sat, 29 Dec 2018 17:38:04 -0000, Clare Snyder <clare@snyder.on.ca
wrote:

On Sat, 29 Dec 2018 08:07:42 -0800, Bob F <bobnospam@gmail.com> wrote:

On 12/29/2018 6:37 AM, trader_4 wrote:
On Saturday, December 29, 2018 at 9:23:42 AM UTC-5, Bill Gill wrote:
On 12/29/2018 7:43 AM, William Gothberg wrote:
Shouldn't we have faster microwaves by now giving out a few kW?
They
were invented decades ago.
Higher powered microwaves would require higher powered electric
outlets, probably 220VAC (in the USA).

Also it is questionable whether higher powered ovens would be
practical for use.  Getting warming times down to a couple of
seconds might not be a good idea.  More speed is not always better.

Bill

+1

That about covers it.  Not sure how useful more power would be.  For
example,
last night I was thawing out a tomato sauce in a quart plastic
container.
The Panasonic has a defrost mode that uses about 30% power and
cycles that.


It gets the 30% power by cycling the 100% power on 30% of the time.

(By the way, adjusting the level does not actually change the wattage.
It simply means the microwave will pulse on and off at its fixed
wattage
until the desired level is reached.)

https://lifehacker.com/5974788/familiarize-yourself-with-your-microwaves-power-settings-to-make-microwave-cooking-a-joy


 That was true of the first generation of Microwaves, but the current
"inverter" driver units actually CAN throttle the power. Inverter
microwaves are much better for defrosting AND cooking.

We've had ours for about 2 years now - replacing our original that we
bought in about 1985.

BIG difference (but the old one would likely still be working by the
time this one dies)

Why is it called an invertor?  I thought an invertor was a device to
increase the voltage - like running 240V devices off a 12V car battery.

Why do you persist in posting waffle about which you know absolutely
nothing, twould be better to post on subjects you know  or ask and
educate yourself about the other

I know what a fucking invertor is, I built my own solar panel system.

LMFAO! There it is again. Nobody else brags about you therefore, brag
about yourself when nobody asked. LMFAO! Pathetic wanker.

 

[William Gothberg]

On Sun, 30 Dec 2018 17:28:31 -0000, Meanie <Me@gmail.com> wrote:

On 12/30/2018 12:09 PM, William Gothberg wrote:
On Sun, 30 Dec 2018 03:09:29 -0000, FMurtz <haggisz@hotmail.com> wrote:

William Gothberg wrote:
On Sat, 29 Dec 2018 17:38:04 -0000, Clare Snyder <clare@snyder.on.ca
wrote:

On Sat, 29 Dec 2018 08:07:42 -0800, Bob F <bobnospam@gmail.com> wrote:

On 12/29/2018 6:37 AM, trader_4 wrote:
On Saturday, December 29, 2018 at 9:23:42 AM UTC-5, Bill Gill wrote:
On 12/29/2018 7:43 AM, William Gothberg wrote:
Shouldn't we have faster microwaves by now giving out a few kW?
They
were invented decades ago.
Higher powered microwaves would require higher powered electric
outlets, probably 220VAC (in the USA).

Also it is questionable whether higher powered ovens would be
practical for use. Getting warming times down to a couple of
seconds might not be a good idea. More speed is not always better.

Bill

+1

That about covers it. Not sure how useful more power would be. For
example,
last night I was thawing out a tomato sauce in a quart plastic
container.
The Panasonic has a defrost mode that uses about 30% power and
cycles that.


It gets the 30% power by cycling the 100% power on 30% of the time.

(By the way, adjusting the level does not actually change the wattage.
It simply means the microwave will pulse on and off at its fixed
wattage
until the desired level is reached.)

https://lifehacker.com/5974788/familiarize-yourself-with-your-microwaves-power-settings-to-make-microwave-cooking-a-joy


That was true of the first generation of Microwaves, but the current
"inverter" driver units actually CAN throttle the power. Inverter
microwaves are much better for defrosting AND cooking.

We've had ours for about 2 years now - replacing our original that we
bought in about 1985.

BIG difference (but the old one would likely still be working by the
time this one dies)

Why is it called an invertor? I thought an invertor was a device to
increase the voltage - like running 240V devices off a 12V car battery.

Why do you persist in posting waffle about which you know absolutely
nothing, twould be better to post on subjects you know or ask and
educate yourself about the other

I know what a fucking invertor is, I built my own solar panel system.

LMFAO! There it is again. Nobody else brags about you therefore, brag
about yourself when nobody asked. LMFAO! Pathetic wanker.

I wasn't bragging, I was stating I know how inverters work. Why on earth would you see that as bragging? You have some weird mental problem.

 

[Cursitor Doom]

On Sun, 30 Dec 2018 17:09:49 +0000, William Gothberg wrote:

> I know what a fucking invertor is, I built my own solar panel system.

There's an outstanding non-sequitur if ever there was one. "I know how to
build a fucking house; I built my own sand castle."



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.

 

[William Gothberg]

On Sun, 30 Dec 2018 18:30:02 -0000, Cursitor Doom <curd@notformail.com> wrote:

On Sun, 30 Dec 2018 17:09:49 +0000, William Gothberg wrote:

I know what a fucking invertor is, I built my own solar panel system.

There's an outstanding non-sequitur if ever there was one. "I know how to
build a fucking house; I built my own sand castle."

How do you think a 12V or 24V solar panel gets 240V AC out of it?

 

[dkol]

"William Gothberg" <William_Gothberg@internet.co.is> wrote in message
newsp.zuugn1yv7uplkq@desktop-ga2mpl8.lan...

On Sun, 30 Dec 2018 05:47:48 -0000, Johnny B Good
johnny-b-good@invalid.ntlworld.com> wrote:

On Sat, 29 Dec 2018 13:23:55 -0800, mike wrote:

On 12/29/2018 10:16 AM, William Gothberg wrote:
On Sat, 29 Dec 2018 17:38:04 -0000, Clare Snyder <clare@snyder.on.ca
wrote:

On Sat, 29 Dec 2018 08:07:42 -0800, Bob F <bobnospam@gmail.com> wrote:

On 12/29/2018 6:37 AM, trader_4 wrote:
On Saturday, December 29, 2018 at 9:23:42 AM UTC-5, Bill Gill wrote:
On 12/29/2018 7:43 AM, William Gothberg wrote:
Shouldn't we have faster microwaves by now giving out a few kW?
They were invented decades ago.
Higher powered microwaves would require higher powered electric
outlets, probably 220VAC (in the USA).

Also it is questionable whether higher powered ovens would be
practical for use. Getting warming times down to a couple of
seconds might not be a good idea. More speed is not always better.

Bill

+1

That about covers it. Not sure how useful more power would be. For
example,
last night I was thawing out a tomato sauce in a quart plastic
container.
The Panasonic has a defrost mode that uses about 30% power and
cycles that.


It gets the 30% power by cycling the 100% power on 30% of the time.

(By the way, adjusting the level does not actually change the
wattage.
It simply means the microwave will pulse on and off at its fixed
wattage until the desired level is reached.)

https://lifehacker.com/5974788/familiarize-yourself-with-your-
microwaves-power-settings-to-make-microwave-cooking-a-joy

That was true of the first generation of Microwaves, but the current
"inverter" driver units actually CAN throttle the power. Inverter
microwaves are much better for defrosting AND cooking.

We've had ours for about 2 years now - replacing our original that we
bought in about 1985.

BIG difference (but the old one would likely still be working by the
time this one dies)

Why is it called an invertor? I thought an invertor was a device to
increase the voltage - like running 240V devices off a 12V car battery.

And why on earth would you not want to cook on full power? I've never
had a reason to lower the power from the maximum of 800W. I want the
meal as soon as possible!

There's been a lot of nitpicking in this thread.

All microwaves reduce power by cycling between 0 and 100% power. The
relative power level is the duty factor of that on/off cycle.

Older microwaves switch the INPUT to the power transformer.
That also runs the filament. The time to heat up the filament is the
limiting factor in how short you can make the on-time.
You get a minimum of about 10 seconds on-time.
That minimum time is plenty to make food explode.

Better microwaves are called "Inverter" microwaves.
I believe they're all licensed from Panasonic.
When I bought mine, it seemed that all the licensees had dried up
leaving Panasonic as the only locally available units.

It's my understanding that they heat the filament independently and can
have very short on-times. Duty factor is the same as the older
microwaves, but the on-time can be much shorter.

I knew the inverter types could still only rely upon variable duty cycle
heating control like the earlier voltage doubling HT transformer/
rectifier/HV capacitor designs did. I just wasn't quite sure what the
benefit of an inverter over a simple voltage doubling circuit was until
you let on about the cathode heater/filament being able to remain fully
powered throughout the whole cycling period.

This 'cathode filament/heater always on' aspect isn't the only benefit
of an inverter type allowing a higher cycling frequency to be employed,
it also provides a well regulated HT voltage, free of the 50/60 Hz ripple
which spoils the efficiency of the magnetron in the older designs.

The HT voltage (and anode current - no longer affected by heating/
cooling cycles imposed upon the cathode) has to be kept to within a
fairly tight tolerance (by the standards typical of domestic white goods)
for optimum operation at the correct microwave frequencies.

The effect of changing anode voltage is analogous to the effect of how
hard you blow across the open top of a beer bottle (empty or partially
empty) to generate a musical tone. The stronger you blow, the higher the
sudden jump in pitch will be. The microwave frequency produced by a
magnetron is likewise affected by how strong a voltage is applied to its
anode and will jump in frequency just like a blown beer bottle and for
exactly the same analogous reason (electrons rather than air molecules
being involved in this case).

In short, the only way to control the power output of a magnetron
without detuning it from its optimum 'microwaving' frequency is by using
variable duty on/off cycling. There's no smooth continuous analogue power
control option in this case.

As for those large 2 and 3 KW microwave ovens used in commercial
kitchens, they use a much larger cooking cavity so that a bunch of "Five
Minute Meals" can be heated concurrently in the recommended 5 minutes
rather than be processed in batches of just one or two at a time.

The microwave energy doesn't magically focus in the deep interior of the
food and heat it from the inside outwards. The microwaves only penetrate
the first centimetre or two before losing sufficient of their energy in
this process so as to have insignificant effect on the deeper interior
which therefore relies upon conduction from the hotter outer portions to
raise its temperature sufficiently to kill any pathogenic micro-organisms
so as to eliminate the risk of food poisoning.

Can we not have a different frequency which goes deeper before being
absorbed?

The frequency used is already the one where water has the best absorption
band.

> Or even a combination of more than one frequency?

No point when those are worse.

> Or a choice depending on the food you're cooking?

It doesn't.

This, as has already been pointed out, takes time and, surprise
surprise, doubling the rate at which microwave energy is being poured
into the outer layers of the foodstuff in question, does not halve the
time required to complete the cooking process.

Indeed, as has also been pointed out, such an increased rate of energy
input will tend to overheat the outer layers so much so as to overcook
them. The increased temperature will simply result in a higher rate of
radiative and convective heat loss back into the cooking cavity with
rather less than you may have imagined making any useful contribution to
raising the deep interior temperature of the foodstuff in question.

Depends what you're cooking/heating in there. If I put in a large bowl of
vegetables in cold water, it takes quite a while to get to boiling point
before the veg starts to cook.

Because there is a lot more water to heat.

And since it's chopped veg in water, everything gets heated, nothing is
more than a cm deep. Doubling the power would heat them up way faster.

Yes but you shouldn't be using that much water when microwaving chopped veg.
When you microwave it with the right amount of water it will cook much
faster.

 

[dkol]

"William Gothberg" <William_Gothberg@internet.co.is> wrote in message
newsp.zuuhyndf7uplkq@desktop-ga2mpl8.lan...

On Sun, 30 Dec 2018 03:09:29 -0000, FMurtz <haggisz@hotmail.com> wrote:

William Gothberg wrote:
On Sat, 29 Dec 2018 17:38:04 -0000, Clare Snyder <clare@snyder.on.ca
wrote:

On Sat, 29 Dec 2018 08:07:42 -0800, Bob F <bobnospam@gmail.com> wrote:

On 12/29/2018 6:37 AM, trader_4 wrote:
On Saturday, December 29, 2018 at 9:23:42 AM UTC-5, Bill Gill wrote:
On 12/29/2018 7:43 AM, William Gothberg wrote:
Shouldn't we have faster microwaves by now giving out a few kW?
They
were invented decades ago.
Higher powered microwaves would require higher powered electric
outlets, probably 220VAC (in the USA).

Also it is questionable whether higher powered ovens would be
practical for use. Getting warming times down to a couple of
seconds might not be a good idea. More speed is not always better.

Bill

+1

That about covers it. Not sure how useful more power would be. For
example,
last night I was thawing out a tomato sauce in a quart plastic
container.
The Panasonic has a defrost mode that uses about 30% power and
cycles that.


It gets the 30% power by cycling the 100% power on 30% of the time.

(By the way, adjusting the level does not actually change the wattage.
It simply means the microwave will pulse on and off at its fixed
wattage
until the desired level is reached.)

https://lifehacker.com/5974788/familiarize-yourself-with-your-microwaves-power-settings-to-make-microwave-cooking-a-joy

That was true of the first generation of Microwaves, but the current
"inverter" driver units actually CAN throttle the power. Inverter
microwaves are much better for defrosting AND cooking.

We've had ours for about 2 years now - replacing our original that we
bought in about 1985.

BIG difference (but the old one would likely still be working by the
time this one dies)

Why is it called an invertor? I thought an invertor was a device to
increase the voltage - like running 240V devices off a 12V car battery.

Why do you persist in posting waffle about which you know absolutely
nothing, twould be better to post on subjects you know or ask and
educate yourself about the other

I know what a fucking invertor is, I built my own solar panel system.

Not the same as an inverter microwave oven.

 

[dkol]

"William Gothberg" <William_Gothberg@internet.co.is> wrote in message
newsp.zuuh51x87uplkq@desktop-ga2mpl8.lan...

On Sun, 30 Dec 2018 03:34:41 -0000, Bill Wright <wrightsaerials@f2s.com
wrote:

On 29/12/2018 17:26, William Gothberg wrote:


I don't need a MW, but the usual 600W to 900W in domestic ovens is
pitiful. What's wrong with 2kW?

I don't find much use for the 1,200W setting. The only real use is for
heating water quickly when the kettle's broken. Even jacket spuds are
cooked unevenly. Thick soup needs to be stirred during cooking. Meat is
hopeless.

I can't comment on the meat as I'm a vegetarian, but surely soup, once any
part reaches boiling or near boiling, is going to bubble about and convect
by moving the liquid about. When I cook soup, I just stir it when it's
finished.

Anyway, for bigger things like a roast, what we need is a different
frequency of microwaves that penetrates deeper. Must be possible.

Not it is not.

 

[dkol]

"William Gothberg" <William_Gothberg@internet.co.is> wrote in message
newsp.zuumf3kj7uplkq@desktop-ga2mpl8.lan...

On Sun, 30 Dec 2018 18:30:02 -0000, Cursitor Doom <curd@notformail.com
wrote:

On Sun, 30 Dec 2018 17:09:49 +0000, William Gothberg wrote:

I know what a fucking invertor is, I built my own solar panel system.

There's an outstanding non-sequitur if ever there was one. "I know how to
build a fucking house; I built my own sand castle."

How do you think a 12V or 24V solar panel gets 240V AC out of it?

A different way to how inverter microwaves do it. Inverter
microwaves use PWM, solar panel inverters don't.

 

[William Gothberg]

On Sun, 30 Dec 2018 20:16:33 -0000, Mark Lloyd <not@mail.invalid> wrote:

On 12/29/18 12:52 PM, William Gothberg wrote:

[snip]

Microwaving something in a cheap shit plastic container is insane. I
always cook or eat things in a real pot bowl. Plastic melts!

The first thing I heated in a microwave was frozen macaroni and cheese.
The instructions said to cover it in plastic wrap. It didn't take me
long to figure out that it was a really bad idea, consider trying to
separate melted plastic from melted cheese.

Indeed, that cheap shit plastic melts in a 700W microwave oven. Or in any microwave oven, it can't handle boiling water, which inevitably you get from the food. And I bet it's rather toxic.

 

[Mark Lloyd]

On 12/30/18 11:11 AM, William Gothberg wrote:

[snip]

Spin?  Does anyone still have those old mechanical meters?  Mine just
blinks an LED.  If I were you I'd test it to see if it's charging you
correctly, apparently they can go off calibration with age.

I've had a meter with a LCD display for almost a decade. There's no
disk, but there is a LCD bargraph that looks like they're trying to make
you think you're looking at a disk.

--
Mark Lloyd
http://notstupid.us/

"Why has a religious turn of mind always a tendency to narrow and harden
the heart?" -- Robert Burns

 

[William Gothberg]

On Sun, 30 Dec 2018 19:51:05 -0000, Mark Lloyd <not@mail.invalid> wrote:

On 12/29/18 12:06 PM, William Gothberg wrote:

[snip]

In the UK we don't have that problem, my kitchen is full of 13A 240V
sockets, just like every other room, it's what I plug my kettle,
dishwasher, washing machine, bread maker, etc, etc into. All of which
would be utterly useless on a 120V circuit.

Here, I use a kettle you put on the stove, and all the others are 120V.

We stopped using stove kettles decades ago. We're a bit more advanced over here. You just pour water in and turn it on, and 3kW heats the water directly, no fucking about with heat conducting from the stove through to the kettle, and leaving a hot stove afterwards.

I thought the USA had 240V
sockets in rooms where they're likely to be needed, like the kitchen?

Some kitchens have a 240V 40A outlet for a stove. Mine is built-in and
hardwired.

So is mine, but my washing machine uses almost 3kW as it heats the water as it fills. Same with my dishwasher. Same with my tumble drier. They can plug into any socket anywhere in the house.

Some older houses have 240V (15 or 20A) sockets (for window air
conditioners).

And where do you plug in a 2kW hoover? I plug mine in any room I'm
hoovering.

Probably get by with a smaller unit.

Useless if you have decent carpets and/or hairy pets.

 

[Mark Lloyd]

On 12/29/18 12:52 PM, William Gothberg wrote:

[snip]

Microwaving something in a cheap shit plastic container is insane.  I
always cook or eat things in a real pot bowl.  Plastic melts!

The first thing I heated in a microwave was frozen macaroni and cheese.
The instructions said to cover it in plastic wrap. It didn't take me
long to figure out that it was a really bad idea, consider trying to
separate melted plastic from melted cheese.

--
Mark Lloyd
http://notstupid.us/

"Why has a religious turn of mind always a tendency to narrow and harden
the heart?" -- Robert Burns