Win Hill: Inverse Marx Generator ??

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That's silly. I can pump ampere-seconds into a resistor for years, and can recover none of them. If I pump amp-seconds into a cap, I can get them back. And how many go in versus how many come out is mathematically predictable, not to mention useful in real life.

John

"John Larkin" wrote in = message news: snipped-for-privacy@4ax.com...

Sure. Voltage is one degree of freedom, so throw in a k_B*T/e. It's a = capacitor, so it's a lowpass filter, so you'll see, well, not 1/f noise, = but something along those lines.

So is the current noise white? dV/dt =3D 0 on a shorted capacitor, so = there's no more filtering going on.

Question: if vacuum is truely empty, then does a vacuum capacitor have = any noise?

Tim

--=20 Deep Friar: a very philosophical monk. Website:

capacitor, so it's a lowpass filter, so you'll see, well, not 1/f noise, but something along those lines.

more filtering going on.

noise?

Since the electrons in the plate are moving around, the population on the surfaces may fluctuate, changing the perceived field at the other plate, so I'd go for a definite maybe.

John

capacitor, so it's a lowpass filter, so you'll see, well, not 1/f noise, but something along those lines.

more filtering going on.

noise?

That works out to about 4e-8 VRMS on a 1 uF cap, if I got that right,

John

genews: snipped-for-privacy@4ax.com...

a capacitor, so it's a lowpass filter, so you'll see, well, not 1/f noise,= but something along those lines.

there's no more filtering going on.

y noise?

Yeah, another step or two. The cap has one degree of freedom so it gets kT/2 (according to the equipartion theorem.) this energy is equal to CV^2/2 so the mean square voltage on the cap V^2 =3D kT/C. One fun thing to ask is, "The temperature of what?" It turns out there has to be some resistance between the ends of the cap. And it is the temperature of the resistor and not the temperature of the cap that matters. (I've done this experiment, which is kinda cool.) This is just a corallary(sp) to Johnson noise.

George H.

Right. If what you're after is the expression for i(t). But I figured I had to drag both of those caps through the equations since the original question was: Where did the original C1 energy go? Make too many simplifications and some folks will call 'Bullshit!'.

capacitor, so it's a lowpass filter, so you'll see, well, not 1/f noise, but something along those lines.

no more filtering going on.

noise?

Real capacitors _are_ noisy. Some foundries now characterize the noise in the Spice subcircuit model. ...Jim Thompson

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If you continue to ignore the phrase "with respect to the external circuit" you will never understand my point. Nor will you resolve your parallel vs serial capacitor paradox. You can pump air INTO a balloon, but you can't pump electrons INTO a component as they always come out the other terminal(s) in the same quantity as went in. Unless of course you have managed to prove Kirchoff wrong in which case I'd love to see the proof.

Art

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enters

You think I'm wrong so please say why. If you convince me I'll admit my error and change my mind.

However, waving your arms around, looking down your nose at others, spouting condescending remarks, offering platitudes and saying nothing specific which could expose you to criticism just isn't going to do it.

Art

No. You can charge a free-floating sphere, as you could electrostatically charge the body of a capacitor, by shooting electrons at it. But charging the body of the cap isn't the same thing as charging the cap internally, which is what we do in electronics.

That's why 0603 caps have voltage ratings and come in different values.

Unless of course you have managed

All this is academic. When we design electronic circuits, we assume that we can pump charge into a cap, and later extract it. We assume that because it works.

John

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energy.

enters

store

I got a free ride thru MIT way back when scholarships were awarded only on merit. What are your credentials?

As for fundamentals, get a textbook. Even John "The Bloviator" Larkin, referring to your description, says, "That's silly" ;-)

I'll post the "charge not conserved" solution tomorrow afternoon... I'm tied up until then.

In the meantime get out a high school physics book. ...Jim Thompson

I didn't follow some orders, and I knocked down a two star General along with his aide (a Captain) a full bird Colonel and the First Sergeant. I also slammed an annoying Lieutenant in the balls with an office chair while on duty at the TV station. The fool was standing right behind me when I had an equipment failure. He had been warned several times to sit down so he wouldn't get hurt. ::)

I didn't get courtmartialed for anything. I did get a letter of commendation from that general, after knocking him down

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All his capacitors are shorted! What do you expect from an invalid, anyway?

matter. I don't know if the quantum vacuum has anything to say about that.

charge seperation occured in a polarizable medium. That works for plastic, and it could even work for air, but it's a lot harder to explain for a vacuum.

That's why no one can explain dimbulb...

I should have issued "partial credit". My apologies! ...Jim Thompson

I'm sure that most of you won't believe this:

Not at first. I had just spotted a sign: 'Next Exit 7 miles' when the engine sputtered to a stop. I pushed the clutch to the floor and coasted about a quarter mile to a stop, uphill. It was the only level spot I had seen in about 50 miles. I was on the flat top of a hill. It was about 3:00 am and I had been awake about 35 hours. I had one day left before the truck tag expired, and about another 750 miles to go.

I got out and checked the gas tank with a piece of wire to find it completely dry. I got back into the truck and started to pray. I had my hands on the steering wheel and my head down on my wrists when my right hand slipped off the steering wheel and knocked the transmission into neutral. The truck started to move, very slowly. After it went about 150 yards it started to pick up speed. Then it started down hill and sped up till it was doing 45 MPH. I saw a lit sign for a gas station after it leveled off. I hit the brakes to slow down just enough to keep from rolling the truck, and ran a stop sign at the foot of the exit ramp. I made a hard right turn, and coasted to the gas station.

Well, thank God for tailwinds. :-)

Jay Ts

I had a similar event on US60 west of Socorro, NM, that long downhill run from about Magdalena. I had forgotten that, in Mormon land, in the White Mountains, they close their gas stations at night :-)

Managed to coast into a station on the outskirts of Socorro.

August 1964, heading to WV for my sister's wedding, in a brand new

Coming back, got a warning ticket on that same hill, as well as one near Dodge City (same day :-)

I've always driven fast :-) ...Jim Thompson

Without the propeller he would never have gone fast enough, though.