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Everybody knows you dont run heavy loads (Iron, AC etc) on batteries but
why?
A normal one ton Air Conditionar (AC) requires 1500 Watts so the current
(amps) required if the mains voltage is 220 should be 1500/220 = 6.8 Amp
A 100 Amp hour battery can provide 100 amperes for 1 hour right?
That means it should be able to run about 14 AC's (100/6.8) for one
hour??????????
I know its nonsense but what am I missing here?
Because they run out very fast.Everybody knows you dont run heavy loads (Iron, AC etc) on batteries but
why?
Yes, but you'd need a 220V battery.A normal one ton Air Conditionar (AC) requires 1500 Watts so the current
(amps) required if the mains voltage is 220 should be 1500/220 = 6.8 Amp
A 100 Amp hour battery can provide 100 amperes for 1 hour right?
That means it should be able to run about 14 AC's (100/6.8) for one
hour??????????
You are missing the connection between power, current and voltage.I know its nonsense but what am I missing here?
You don't say much about the load. As someone already points out aHello All
We have a problem with the a TRIAC device we are using.
We are using it to switch 230V AC mains on and Off.
The gate is connected directly to the output of our Attiny processor.
The whole cct is at mains level with + 5V generated from the mains for
the processor.
THE PROBLEM: using a lead from the PSU to the gate of the TRIAC we can
turn the device (and the mains) on and off. we cimply connect to +5V
for on, disconnect for off.
HOWEVER, with the processor we can turn the device on but not Off.
On investigation(circuit with gate connected to processor) we find
that on the gate we have a component from the mains, roughly at 0.2V
peak. This appears to be coming to the gate through the other mains
connected pins on the device. This mains component is capable of
keeping the device on. The pull down capability of the ATTiny
processor is poor and is having little effect on this mains component
on the gate.
the device is a 2N6073 from On Semi
http://www.onsemi.com/PowerSolutions/product.do?id=2N6073A
Should I be using an isolated gate TRIAC? or is there some solution to
removing this component getting on the gate.
Many thanks for any responses
Denis
__________________________
http://www.CentronSolutions.com
Yup, and make the resistance in the capacitance branch equal to theOn Mon, 18 May 2009 02:46:26 -0700 (PDT), dgleeson422111
dglees...@eircom.net> wrote:
Hello All
We have a problem with the a TRIAC device we are using.
We are using it to switch 230V AC mains on and Off.
The gate is connected directly to the output of our Attiny processor.
The whole cct is at mains level with + 5V generated from the mains for
the processor.
THE PROBLEM: using a lead from the PSU to the gate of the TRIAC we can
turn the device (and the mains) on and off. we cimply connect to +5V
for on, disconnect for off.
HOWEVER, with the processor we can turn the device on but not Off.
On investigation(circuit with gate connected to processor) we find
that on the gate we have a component from the mains, roughly at 0.2V
peak. This appears to be coming to the gate through the other mains
connected pins on the device. This mains component is capable of
keeping the device on. The pull down capability of the ATTiny
processor is poor and is having little effect on this mains component
on the gate.
the device is a 2N6073 from On Semi
http://www.onsemi.com/PowerSolutions/product.do?id=2N6073A
Should I be using an isolated gate TRIAC? or is there some solution to
removing this component getting on the gate.
Many thanks for any responses
Denis
__________________________
http://www.CentronSolutions.com
You don't say much about the load. As someone already points out a
inductive reactive load can easily cause the Triac to stay on.
I had a similar problem. Heater controller was working OK but the
triac seemed to be firing for random lengths of time - not with the
on/off PWM proportional control it was designed for.
The heater was a long length of nichrome wire coiled into a large
quartz tube that worked as an immersion heater down in a laboratory
media reservoir. I calculated the inductance based on a single layer
solenoid wound coil, using a formula from the Amateur's Radio
Handbook. Then calculated the capacitive reactance needed to cancel
the inductive reactance, and put it across the heater with a low value
series resistor to lower the Q, and the thing behaved perfectly.
--- Hide quoted text -
- Show quoted text -
On a three wire system, you'd use chassis ground for EMI ESDOn one side there is AC withits neutral (ground), and the other side
is the MPU, its isolated supply, inputs and drivers.
Our thieves are stupider - they keep digging up fibre-optic cable!On Wed, 20 May 2009 21:54:55 -0700, Robert Baer
robertbaer@localnet.com> wrote:
On one side there is AC withits neutral (ground), and the other side
is the MPU, its isolated supply, inputs and drivers.
On a three wire system, you'd use chassis ground for EMI ESD
protection. AC neutral is only tied to ground at the service entrance
where there is (should be) a wire to a stake into the earth. The
neutral and ground, for distribution, come together at the circuit
breaker panel.
There is (should be) a ground at the step down distribution
transformer too. That one can go missing if its a pole transformer,
since copper prices are up.
--
Is there anything like an electronic -- not necessarily digital --We are mechanical designers & Toolmakers........happy to help out on
projects or just answer your questions
Doing distance? How about an LVDT?We are mechanical designers & Toolmakers........
happy to help out on projects or just answer
your questions
Is there anything like an electronic -- not
necessarily digital -- dial indicator that provides
acceleration as well as deflection every few
milliseconds?
Better still, would be something that already
divides the distance measurement by the
acceleration.
Best of all would be something like a strain
gage circuit.
Two op amps doing differentiation on position...Resistance divided by the second time
derivative of resistance . . .
Two.I bet that can be done with a capacitor
No it would take a bit more than that. Division requires a log amp,or inductor or at most a single op amp.
Distance is what strain is all about.We are mechanical designers & Toolmakers........
happy to help out on projects or just answer
your questions
Is there anything like an electronic -- not
necessarily digital -- dial indicator that provides
acceleration as well as deflection every few
milliseconds?
Better still, would be something that already
divides the distance measurement by the
acceleration.
Best of all would be something like a strain
gage circuit.
Doing distance? ďż˝
That may work. In fact, it might not take much modification to getHow about an LVDT?
Thanks.Resistance divided by the second time
derivative of resistance . . .
Two op amps doing differentiation on position...
I bet that can be done with a capacitor
Two.
or inductor or at most a single op amp.
No it would take a bit more than that. �Division requires a log amp,
which are tricky beasts.
If you include grossly obese folk -- I know I would --, then that'sOnline communication can wonderfully liberate the tender soul of some
well-meaning personage who, for whatever reason, is physically
uncharismatic.
What's the down side?Unfortunately, online communication also fertilizes the
eccentricities of hopeless cranks, who at last find themselves in firm
possession of a wondrous soapbox that the Trilateral Commission and
the Men In Black had previously denied them."
---A few months ago some cranks on sci.electronics.basics were pretending
they had a tech background. One dunce, posting under the name John
Fields, claimed he had a money making patent but he was too modest to
give the patent number.
---An inventor search of "John Fields" -- something the dunce could have
done himself -- brought up zero hits on http://www.uspto.gov/patft/index.html.
that's because they can afford food.Online communication can wonderfully liberate the tender soul of some
well-meaning personage who, for whatever reason, is physically
uncharismatic.
If you include grossly obese folk -- I know I would --, then that's
30% of Americans.
There is little question high volume newsgroups posters will have an
even higher obesity rate, just as red states generally have higher
obesity rates than blue states.
Well, yes; a kind of linear motor can be connected as a generator,Is there anything like an electronic -- not necessarily digital --
dial indicator that provides acceleration as well as deflection every
few milliseconds?
Why?Better still, would be something that already divides the distance
measurement by the acceleration.
Alas, strain gages are complex, it can take five of 'em andBest of all would be something like a strain gage circuit.
besides, junkies are always skinny.Bret_E_Cahill@yahoo.com wrote:
Online communication can wonderfully liberate the tender soul of some
well-meaning personage who, for whatever reason, is physically
uncharismatic.
If you include grossly obese folk -- I know I would --, then that's
30% of Americans.
There is little question high volume newsgroups posters will have an
even higher obesity rate, just as red states generally have higher
obesity rates than blue states.
that's because they can afford food.
True but like you, showing them up likely at least gives them pauseOnline communication can wonderfully liberate the tender soul of some
well-meaning personage who, for whatever reason, is physically
uncharismatic.
If you include grossly obese folk -- I know I would --, then that's
30% of Americans.
There is little question high volume newsgroups posters will have an
even higher obesity rate, just as red states generally have higher
obesity rates than blue states.
Getting these folk and the spree shooters off the street is one of the
greatest benefits of the info age.
Unfortunately, online communication also fertilizes the
eccentricities of hopeless cranks, who at last find themselves in firm
possession of a wondrous soapbox that the Trilateral Commission and
the Men In Black had previously denied them."
What's the down side?
If you don't don't like crank posts, then don't click on them.
If you want to save others from being misled by crank posts [read: if
you are daydreaming about censorship], well, you might as well
daydream about perpetual motion machines and the Masons having some
kind of extraordinary political power.
To be more blunt:
If you don't just accept freedom of communication but _embrace_ free
speech for all including every wacko on the planet, you are bat crap
insane.
Online cranks are individuals and unlike groups like creationists or
gun nutters, they occasionally provide an opportunity to educate the
general public.
A related problem, probably due to the recession, is many posters are
in pretend land.
A few months ago some cranks on sci.electronics.basics were pretending
they had a tech background. One dunce, posting under the name John
Fields, claimed he had a money making patent but he was too modest to
give the patent number.
An inventor search of "John Fields" -- something the dunce could have
done himself -- brought up zero hits onhttp://www.uspto.gov/patft/index.html.
Another crank was pretending he was involved in $200 million worth of
circuit design business yet claimed there was no mention of himself in
the public record.
I told him, "hey, buddy, if you ain't in the public record, you ain't
moving no dough. What you are telling us isn't just implausible or
incredible, but impossible."
Another crank claimed that computer cards, like those on the 2nd
crank's web page, were a "niche market."
He then made some idle threats to sue for defamation but soon back
peddaled.
Again, cranks provide an opportunity to educate the general public.
Embrace free speech, don't daydream about censorship.
Bret Cahill
---Aren't you gonna try to defend the other dunce who claimed computer
cards were a niche market?
---Science, political conspiracy and other cranks aren't completely
dysfunctional. A lone crank just isn't a threat to anything.
---As Nietzsche said, "insanity is rare in individuals but it is the norm in
peoples, movements and ages."
Science, political conspiracy and other cranks aren't completelyOnline communication can wonderfully liberate the tender soul of some
well-meaning personage who, for whatever reason, is physically
uncharismatic.
If you include grossly obese folk -- I know I would --, then that's
30% of Americans.
There is little question high volume newsgroups posters will have an
even higher obesity rate, just as red states generally have higher
obesity rates than blue states.
Getting these folk and the spree shooters off the street is one of the
greatest benefits of the info age.
Unfortunately, online communication also fertilizes the
eccentricities of hopeless cranks, who at last find themselves in firm
possession of a wondrous soapbox that the Trilateral Commission and
the Men In Black had previously denied them."
What's the down side?
If you don't don't like crank posts, then don't click on them.
If you want to save others from being misled by crank posts [read: �if
you are daydreaming about censorship], well, you might as well
daydream about perpetual motion machines and the Masons having some
kind of extraordinary political power.
To be more blunt:
If you don't just accept freedom of communication but _embrace_ free
speech for all including every wacko on the planet, you are bat crap
insane.
Online cranks are individuals and unlike groups like creationists or
gun nutters, they occasionally provide an opportunity to educate the
general public.
A related problem, probably due to the recession, is many posters are
in pretend land.
A few months ago some cranks on sci.electronics.basics were pretending
they had a tech background. � �One dunce, posting under the name John
Fields, claimed he had a money making patent but he was too modest to
give the patent number.
An inventor search of "John Fields" -- something the dunce could have
done himself -- brought up zero hits onhttp://www.uspto.gov/patft/index..html.
Another crank was pretending he was involved in $200 million worth of
circuit design business yet claimed there was no mention of himself in
the public record.
I told him, "hey, buddy, if you ain't in the public record, you ain't
moving no dough. �What you are telling us isn't just implausible or
incredible, but impossible."
Another crank claimed that computer cards, like those on the 2nd
crank's web page, were a "niche market."
He then made some idle threats to sue for defamation but soon back
peddaled.
Again, cranks provide an opportunity to educate the general public.
Embrace free speech, don't daydream about censorship.
Bret Cahill
True but like you, showing them up likely at least gives them pause
for thought before spamming the group with utter nonsense if people
are going to call them out on it. At least for the ones that are mild
cranks.
High starch food with little other nutritional value.Online communication can wonderfully liberate the tender soul of some
well-meaning personage who, for whatever reason, is physically
uncharismatic.
If you include grossly obese folk -- I know I would --, then that's
30% of Americans.
There is little question high volume newsgroups posters will have an
even higher obesity rate, just as red states generally have higher
obesity rates than blue states.
that's because they can afford food.