Op amps problem Gain Calculation

[%]

On 2018-12-30 12:50 p.m., William Gothberg wrote:

On Sun, 30 Dec 2018 19:37:27 -0000, Mark Lloyd <not@mail.invalid> wrote:

On 12/29/18 11:26 AM, William Gothberg wrote:

[snip]

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

Microwave heating instructions usually say what power they're for. Most
I've seen recently say 1 or 1.1KW. Maybe that's the normal for the new
units.

BTW, I have a 700W microwave about 30 years old.

The heating instructions are based on what is commercially available.
If there were 2kW units around, they'd have those listed too, with
shorter cooking times.

have you tried your dick in the micro yet ,
set it on high for 30 seconds ,
that will tell you if the microwave is ,
heating quickly enough

 

[Mark Lloyd]

On 12/29/18 12:25 PM, Arthur Conan Doyle wrote:

"William Gothberg" <William_Gothberg@internet.co.is> wrote:

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

In the US 240v sockets are typically found in the kitchen for use by an electric
range, or in a dedicated laundry room for use by an electric dryer. Sometimes
they can be found in a garage. The interior outlets are typicaly located behind
the appliance - in effect dedicated for that appliance and not intended for
general use.

I know of one house around here that has a 240V socket in a storage room
in the yard. I think one of the former owners put it in for a welder. I
know of a later owner who used it for a porcelain kiln.

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

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

 

[Mark Lloyd]

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.

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.

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.

--
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 19:37:27 -0000, Mark Lloyd <not@mail.invalid> wrote:

On 12/29/18 11:26 AM, William Gothberg wrote:

[snip]

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

Microwave heating instructions usually say what power they're for. Most
I've seen recently say 1 or 1.1KW. Maybe that's the normal for the new
units.

BTW, I have a 700W microwave about 30 years old.

The heating instructions are based on what is commercially available. If there were 2kW units around, they'd have those listed too, with shorter cooking times.

 

[William Gothberg]

On Sun, 30 Dec 2018 20:20:18 -0000, trader_4 <trader4@optonline.net> wrote:

On Sunday, December 30, 2018 at 12:16:27 PM UTC-5, William Gothberg wrote:
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.

Only a moron would cook a pizza in a microwave.

No, anyone who wants it ready more quickly. I buy the frozen pizza in the supermarket, place it in the microwave, then I can eat it in 4 minutes.

Why would you think pizzas shouldn't go in microwaves?! Every foodstuff can be cooked in a microwave.

 

[Peeler]

On Mon, 31 Dec 2018 05:54:22 +1100, dkol, better known as cantankerous
nym-shifting trolling senile geezer Rot Speed, wrote:


> Not it is not.

LOL

--
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 14:16:33 -0600, Mark Lloyd, another braindead,
troll-feeding, senile Yankie idiot, blathered again:

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.

Hard to tell which of you two driveling idiots is the bigger idiot! <BG>

 

[Peeler]

On Sun, 30 Dec 2018 13:51:05 -0600, Mark Lloyd, another braindead,
troll-feeding, senile Yankie idiot, blathered again:


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

No shit! Do you? How very interesting, senile Yank! <tsk>

 

[dkol]

"William Gothberg" <William_Gothberg@internet.co.is> wrote in message
newsp.zuuqy6kq7uplkq@desktop-ga2mpl8.lan...

On Sun, 30 Dec 2018 20:20:18 -0000, trader_4 <trader4@optonline.net
wrote:

On Sunday, December 30, 2018 at 12:16:27 PM UTC-5, William Gothberg
wrote:
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.

Only a moron would cook a pizza in a microwave.

No, anyone who wants it ready more quickly. I buy the frozen pizza in the
supermarket, place it in the microwave, then I can eat it in 4 minutes.

Why would you think pizzas shouldn't go in microwaves?! Every foodstuff
can be cooked in a microwave.

Plenty of food is much better cooked in other than a microwave.
That includes pizzas, pies, leg of lamb, steaks, chops etc.

Microwaves do veg well and other stuff like rice and soup
and even just tea and coffee hot water but with plenty of
other stuff you get a better result with something different.

 

[Peeler]

On Mon, 31 Dec 2018 05:52:28 +1100, dkol, better known as cantankerous
nym-shifting trolling senile geezer Rot Speed, wrote:

<FLUSH trollshit>

So, what's with your newest nym, you 85-year-old senile cretin? Gotten into
too many people's killfiles again? LMAO

--
Richard addressing Rot Speed:
"Shit you're thick/pathetic excuse for a troll."
MID: <ogoa38$pul$1@news.mixmin.net>

 

[William Gothberg]

On Sun, 30 Dec 2018 04:24:23 -0000, mike <ham789@netzero.net> wrote:

On 12/29/2018 7:02 PM, FMurtz wrote:
William Gothberg wrote:
On Sat, 29 Dec 2018 17:34:22 -0000, Arthur Conan Doyle
dont@bother.com> wrote:

"William Gothberg" <William_Gothberg@internet.co.is> wrote:

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

There are higher rating consumer units, but you have to look for
them. I had a
1.2kw range hood type that worked much better than the 900w types. I
think
commerical units (i.e. convenience store) can be found that are 1.8kw.

That said, what I find annoying is that the power control for every
consumer
microwave I've seen is duty cycle based. That is, so many seconds of
full power
followed by so many seconds of no power.

Some foods and defrosting would work much better if the actual power
level could
be adjusted. Panasonic claims to make an inverter based design, but
I'm not
convinced they actually adjust the outpout power.
They adjust the AVERAGE power at a rate much faster than the
thermal time constant of the food.

I'm unsure how magnetrons work, but what's the big deal with running
them at half power? Do they have to be on full power, and also can't
be cycled more quickly?
I don't think you can change the operating voltage far enough to
get a large enough range of power. And how would you do that anyway?

I was thinking just tappings on a transformer.

You'd have to use an inverter to do it efficiently. Might as well
just switch the power on and off directly. Everything works at
optimum efficiency or is off.

Well if it doesn't like running at low power, then yes I guess cycling is better. Like an incandescent lightbulb sux at producing light at half voltage. You just get heat.

Anyway, I've never used a microwave on anything other than full power
- even when defrosting, which for some reason people think you have to
select "defrost". Why? It just takes longer. I can defrost food
much faster on full power.

Break an egg into a bowl. Stick it in the microwave on high.
Be ready with the cleaning supplies to get the egg off the inside
of your oven. The yoke usually explodes first.
If you break the yoke, the whites will explode anyway.
You really have to whip it up to prevent explosion.

Eggs are unusual. Most foods aren't explosive.

> You can get a similar effect with soup.

I don't, I regularly heat soup on full power.

Because that is not defrosting it is cooking, Not remotely like
defrosting, methinks thou art a dill.

Another weird thing my current (Hyundai 800W) microwave does is to
switch off the heating completely for the last 15 seconds but continue
to run the fan, light, and turntable (if you've selected at least 4
minutes time). So er like why not just remove the food 15 seconds
earlier? Which I often do. Funnily enough nothing ever exploded.

Might have been a design tradeoff to let the magnetron run too hot
and need 15 seconds for it to cool down sufficiently.

No need to make the user wait though! I'd have it switch off the turntable, lamp, and magnetron, then just run the cooling fan, like some cars do. It also means it's subtracting 15 seconds from your cooking time, which means you get the wrong cooking time.

I don't remember any explosion issues with my old 600W Amana.
My Panasonic Inverter on High will explode an egg faster than
you can say, "oh crap, I forgot to cover the dish."

Try xmas tree lights

 

[Peeler]

On Mon, 31 Dec 2018 05:48:14 +1100, dkol, better known as cantankerous
nym-shifting trolling senile geezer Rot Speed, wrote:

<FLUSH another 169 lines of the two prize idiots' endless sick drivel
unread>

--
The Natural Philosopher about senile Rot:
"Rod speed is not a Brexiteer. He is an Australian troll and arsehole."
Message-ID: <pu07vj$s5$2@dont-email.me>

 

[William Gothberg]

On Sun, 30 Dec 2018 20:42:13 -0000, Mark Lloyd <not@mail.invalid> wrote:

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.

Mine just has a blinking LED which seems to blink every so many joules. And an LCD display which says how much I've used - it's what you use to "read the meter", which I do myself to get a discount. I think the only reason I have this modern one is a while back I changed to a dual tarriff, cheaper at evenings and weekends, which I no longer use as it's no longer the cheapest, so the meter just charges the same for both times. That dual tarriff required a more complex meter than just a spinning disk with one readout.

 

[Mike_Duffy]

On Mon, 31 Dec 2018 05:54:22 +1100, dkol wrote:

"William Gothberg" <William_Gothberg@internet.co.is> wrote

Must be possible.

No it is not.

Well, you *could* change the frequency to have the microwaves penetrate
further, but then they would not cook food because the frequency is
specifically tuned so that the photon energy of the microwaves corresponds
to the primary molecular quantuum spin state of a water molecule.

Dkol is astute albeit curt on this matter.

--
http://mduffy.x10host.com/index.htm

 

[Peeler]

On Sun, 30 Dec 2018 14:42:13 -0600, Mark Lloyd, another braindead,
troll-feeding, senile Yankie idiot, blathered again:


<FLUSH the two idiots' idiotic drivel>

 

[William Gothberg]

On Sun, 30 Dec 2018 21:57:06 -0000, <gfretwell@aol.com> wrote:

On Sun, 30 Dec 2018 13:37:27 -0600, Mark Lloyd <not@mail.invalid
wrote:

On 12/29/18 11:26 AM, William Gothberg wrote:

[snip]

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

Microwave heating instructions usually say what power they're for. Most
I've seen recently say 1 or 1.1KW. Maybe that's the normal for the new
units.

BTW, I have a 700W microwave about 30 years old.

Mine is more like 45

Mine tend to blow up before that age. My last one decided to run continuously, I guess something shorted out when some condensed water got through the centre whatsit on the turntable. I was in a foul mood at the time and couldn't be bothered repairing it, since they're so common you can get them for free on freecycle.

 

[Peeler]

On Mon, 31 Dec 2018 08:10:53 +1100, dkol, better known as cantankerous
nym-shifting trolling senile geezer Rot Speed, wrote:

Plenty of food is much better cooked in other than a microwave.
That includes pizzas, pies, leg of lamb, steaks, chops etc.

Microwaves do veg well and other stuff like rice and soup
and even just tea and coffee hot water but with plenty of
other stuff you get a better result with something different.

....and now thank the retarded troll for giving you another opportunity to
spout yet more of your shit!

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

 

[Max Demian]

On 30/12/2018 17:11, William Gothberg wrote:

On Sun, 30 Dec 2018 09:10:46 -0000, Andy Bennet <andyb@andy.com> wrote:
On 29/12/2018 18:21, % wrote:

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?

Me! Me! Me!

Mine just
blinks an LED.

I was in a place with one of those. Spit!

With the spinning disc I can calculate the instantaneous power
consumption, which all those fancy "smart meters" can do.

--
Max Demian

 

[William Gothberg]

On Sun, 30 Dec 2018 23:41:32 -0000, Max Demian <max_demian@bigfoot.com> wrote:

On 30/12/2018 17:11, William Gothberg wrote:
On Sun, 30 Dec 2018 09:10:46 -0000, Andy Bennet <andyb@andy.com> wrote:
On 29/12/2018 18:21, % wrote:

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?

Me! Me! Me!

Why are you so excited about it?

Mine just
blinks an LED.

I was in a place with one of those. Spit!

Why spit? They're probably more accurate.

With the spinning disc I can calculate the instantaneous power
consumption, which all those fancy "smart meters" can do.

Mine is not a smart meter, I would have to be held at gunpoint to have that installed in my house. My energy supplier (EDF) has attempted to contact me 30 times by phone and 5 times by letter to get one. They are blocked on my phone (although it does register every attempt to phone me, which is a source of amusement - not once did they bother leaving an answerphone message). Letters go in the bin where they belong.

 

[Peeler]

On Sun, 30 Dec 2018 23:41:32 +0000, Max Demian, an especially stupid,
notorious, troll-feeding, senile idiot, blathered

Spin?  Does anyone still have those old mechanical meters?

Me! Me! Me!

<BG> Poor senile idiot!