Dividing and Multiplying Voltages

Guest
Hi mates.

Albert's here. I'm new here and i'm seeking your helps regarding the
following.

I'm working on a project which involves the arithmetic operations (+,
-, X, /) on voltages. Using ADC conversion is not applicable in my
case. The project is to capture 4 voltages from 4 testpoints from a
PCBA, ie A, B, C and D. After capturing the 4 voltages, we need to do
the following calculations:

Result = ((A+B)-(C+D))/(A+B+C+D)

For the addition and subtraction parts, i've got the idea of using
summing amplifier and inverting amplifier to perform the functions. If
you have other suggestion, kindly share with me. Fyi, the voltage
values are about 0.3V.

For the multiplying & division's parts, please give suggestion for the
circuit.
Thanks and hope to get your response soon.

Cheers,
Albert Leng
 
Robert Baer wrote:

Be advised the OP is worse than a troll and is a stupid idiot - and i
am being polite.
He posted on the petroleum NG that there is unlimited oil, and
fruthermore that there is oil on Mars.
Click to expand...
But, imho, we shouldn't withhold a good discussion from entering the
archive because of the source of the original question.

--
John Popelish
 
In article <41C14CD3.73404CCB@earthlink.net>,
Robert Baer <robertbaer@earthlink.net> wrote:
[..]
He posted on the petroleum NG that there is unlimited oil, and
fruthermore that there is oil on Mars.
Click to expand...
He is right if that is as far as he went.

If you count all the tar sands and trapped non-recoverable oil, we will
run out of air to breath before we would run out of oil. If you look only
at what oil we can lay our hands on, the situation is quite different.

A few years back a fellow by the name of Dr. Gold got a bunch of funding
to drill in a place where no oil should exist (except for the primordial)
and as a result added a teaspoon full of oil to the worlds supply. There
is very likely to be some oil on Mars. Not all of it would have been
baked out when the place was formed.


--
--
kensmith@rahul.net forging knowledge
 
Ken Smith wrote...
Robert Baer wrote:
[..]
He posted on the petroleum NG that there is unlimited oil, and
furthermore that there is oil on Mars.

He is right if that is as far as he went. [ snip ]
A few years back a fellow by the name of Dr. Gold got a bunch of funding
to drill in a place where no oil should exist (except for the primordial)
and as a result added a teaspoon full of oil to the worlds supply. There
is very likely to be some oil on Mars. Not all of it would have been
baked out when the place was formed.
Click to expand...
The 80 barrels of oil recovered from a depth between 5km and 7km in the
crystalline granite of Sweden between 1986 and 1993 wasn't much to burn,
but the purpose was to show established theories of oil formation are
either wrong or at least incomplete. This wasn't primordial oil exactly.
Significant amounts of oil may someday be found in unexpected locations.


--
Thanks,
- Win
 
Ken Smith wrote:
In article <pan.2004.12.17.02.00.51.438910@example.net>,
Rich Grise <rich@example.net> wrote:
[...]
Well, if you drilled deep enough, couldn't you just extend a couple of
pipes down the hole, connected with a U at the bottom, and pump water down
one and run a turbine with the steam that comes up out of the other one?

Yes but it won't work very well unless that is a very deep hole you drill.
Although it is common for the bottoms of oil wells to be above 200C, rocks
aren't very thermally conductive.

You may be better off not actually putting the U at the bottom but instead
forcing the water to flow through the rocks.

--
--
kensmith@rahul.net forging knowledge
Click to expand...
Yup!
 
John Woodgate wrote:

What we don't know enough about yet, even to decide if it's so easy as
to be almost inevitable, or almost impossibly difficult, is the
spontaneous synthesis of *self-replicating* molecules. But, to me, the
trend of discovery points towards the 'inevitable' end of the scale.
Click to expand...
There's a lot of stuff written on this, try Dawkins, Dennett, Gould etc.
When I'm rich enough to be irresponsible, I'm going to sponsor a prize
for the simplest self- replicating molecule synthesised from scratch.
The only trouble is, they might come up with a better one than DNA...

Paul Burke
 
John Woodgate wrote:
I read in sci.electronics.design that Kevin Aylward
salesEXTRACT@anasoft.co.uk> wrote (in
jjxwd.55790$tg2.29938@fe1.news.b lueyonder.co.uk>) about 'Dividing
and Multiplying Voltages', on Fri, 17 Dec 2004:

But the idea that *hugely* complex molecules spontaneously existed at
the from the big bang, makes little sense to me.

Nor to me, and there is no need for such an unlikely hypothesis.

I'm not a chemist, but
I see little alternate other then complex molecules are formed from
less complex ones. How, I have no idea. I am not a chemist.

Never mind; the spontaneous synthesis of complex molecules is easy.
It's happening in your friendly neighbourhood gas-cloud as I write.
(;-)

What we don't know enough about yet, even to decide if it's so easy as
to be almost inevitable, or almost impossibly difficult, is the
spontaneous synthesis of *self-replicating* molecules. But, to me,
the trend of discovery points towards the 'inevitable' end of the
scale.
Click to expand...
Same here.


Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
 
John Woodgate wrote...
Rich Grise wrote ...
Well, if you drilled deep enough, couldn't you just extend a
couple of pipes down the hole, connected with a U at the bottom,
and pump water down one and run a turbine with the steam that
comes up out of the other one?

You just re-invented geothermal energy. What next? The steam
engine? (;-)
Click to expand...
Rich's remark misses the point of Thomas Gold's deep-drilling
exercise, which was not that one can find more oil for our use
deep in the earth, but to prove conclusively that the popular
theories of the origin of oil are wrong or at least incomplete.
Following other Thomas Gold research shows that he believes
easier-to-reach oil may one day be found in unexpected places.


--
Thanks,
- Win
 
Robert Baer wrote:
Rich Grise wrote:

On Thu, 16 Dec 2004 14:53:28 -0800, Winfield Hill wrote:

Ken Smith wrote...

Robert Baer wrote:
[..]
He posted on the petroleum NG that there is unlimited oil, and
furthermore that there is oil on Mars.

He is right if that is as far as he went. [ snip ]
A few years back a fellow by the name of Dr. Gold got a bunch of funding
to drill in a place where no oil should exist (except for the primordial)
and as a result added a teaspoon full of oil to the worlds supply. There
is very likely to be some oil on Mars. Not all of it would have been
baked out when the place was formed.

The 80 barrels of oil recovered from a depth between 5km and 7km in the
crystalline granite of Sweden between 1986 and 1993 wasn't much to burn,
but the purpose was to show established theories of oil formation are
either wrong or at least incomplete. This wasn't primordial oil exactly.
Significant amounts of oil may someday be found in unexpected locations.

Well, if you drilled deep enough, couldn't you just extend a couple of
pipes down the hole, connected with a U at the bottom, and pump water down
one and run a turbine with the steam that comes up out of the other one?

Thanks,
Rich

Actually, ther are a goodly number of geo-thermal (steam) electric
power generators.
Mexico has at least an order of magnitude (or s) more than the US, and
we have been piddling in other directions and crying about oil to boot.
Click to expand...
Geothermal tends to be marginal because of extreme corrosion problems
and otherwise limited lifetimes.

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
In article <32g067F3jtdolU1@individual.net>,
Paul Burke <paul@scazon.com> wrote:
John Woodgate wrote:

What we don't know enough about yet, even to decide if it's so easy as
to be almost inevitable, or almost impossibly difficult, is the
spontaneous synthesis of *self-replicating* molecules. But, to me, the
trend of discovery points towards the 'inevitable' end of the scale.

There's a lot of stuff written on this, try Dawkins, Dennett, Gould etc.
When I'm rich enough to be irresponsible, I'm going to sponsor a prize
for the simplest self- replicating molecule synthesised from scratch.
The only trouble is, they might come up with a better one than DNA...
Click to expand...
Its already been done with the polio virus so you are too late.

--
--
kensmith@rahul.net forging knowledge
 
In article <pan.2004.12.17.21.07.48.136641@example.net>,
Rich Grise <rich@example.net> wrote:
[...]
Well, viruses (viri?) don't self-replicate. They co-opt the machinery of
live cells to make it make copies of itself. Or at least that's what they
told me in biology class a thousand years ago.
Click to expand...
They use things in their environment to make more copies of themselves.

Other reproducing things do so in a harder environment but they too use
things from their environment. I say this is a matter of degree.

Since you didn't say "but not viruses", you owe the folks that did it a
huge sum of money. They will be right over to collect and/or demostrate
the lastest man made diseases for you. :)

--
--
kensmith@rahul.net forging knowledge
 
On Sat, 18 Dec 2004 11:03:16 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Richard The Troll
rtt@example.net> wrote (in <pan.2004.12.18.08.45.45.684812@example.net
) about 'Dividing and Multiplying Voltages', on Sat, 18 Dec 2004:

So, if you have one octopus, you have one octopus. If you add an
octopus, you have two what?

It's a Greek noun in -us, so the pedantic plural is octopodes.
Rhinocerates, too.
Click to expand...
Have mercy on odes (or ates?).
 
Winfield Hill wrote...
Kevin Aylward wrote...
Robert Baer wrote:
Kevin Aylward wrote:
Rich Grise <rich@example.net> wrote:

Well, viruses (viri?) don't self-replicate. ...

... Viruses are really only particles. ...

Err.......... the correct term is "virii" (plural of "virus").

Apparantly not. "Viruses" is in the dictionary, "virii" is not.
So, amazingly, KA has won a spelling contest. Wonders will never
cease.

Yep. From http://dictionary.reference.com

Q. What is the plural of virus?
A. Viruses.
Click to expand...
There's another school of thought that says the plural is virus.

Ton E. van den Bogaard, University Maastricht, the Netherlands:
"... according to my Latin grammar, the plural of the noun virus
in Latin is, like the plural nowadays used for virus in Romance
languages (e.g., Italian and French), also virus."



--
Thanks,
- Win
 
John Fields wrote...
Winfield Hill wrote:

Ton E. van den Bogaard, University Maastricht, the Netherlands:
"... according to my Latin grammar, the plural of the noun virus
in Latin is, like the plural nowadays used for virus in Romance
languages (e.g., Italian and French), also virus."

Fine, but so what? What's being debated is the composition of
its plural in _English_.
Click to expand...
The it'd have to be viruses, right?


--
Thanks,
- Win
 
On Sat, 18 Dec 2004 05:40:44 -0800, Winfield Hill wrote:

John Fields wrote...

Winfield Hill wrote:

Ton E. van den Bogaard, University Maastricht, the Netherlands:
"... according to my Latin grammar, the plural of the noun virus
in Latin is, like the plural nowadays used for virus in Romance
languages (e.g., Italian and French), also virus."

Fine, but so what? What's being debated is the composition of
its plural in _English_.

The it'd have to be viruses, right?
Click to expand...
Absolutely! Even Kevin agrees on this one!

Cheers!
Rich
 
In article <pan.2004.12.18.08.45.45.684812@example.net>,
Richard The Troll <rtt@example.net> wrote:
[...]
So, if you have one octopus, you have one octopus. If you add an octopus,
you have two what?
Click to expand...
Two bills for live stock and one well fed octopus :>


I think octopuses is now accepted. It should be -podes, IIRC, but
millions of people being wrong can make something right.

--
--
kensmith@rahul.net forging knowledge
 
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