a question about resistors in an arc experiment

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gative

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I am fairly certain I've seen it use that same nym before.

ive

You need to look in McMaster for them. Shunt connected generators are negative resistors.

slope

If you visit SED to lecture us on how we should be what we are, and how we should talk to each other, you won't make a lot of friends. I don't know if that matters to you.

By my standards, the opamp thing has a negative resistance at its terminals. And a tunnel diode is a negative-resistance device.

Post some circuits you've designed and we'll take a crack at them.

John

Good point. Induction generators are AC negative resistors, I guess.

John

"John Larkin" Sylvia Else

Here is her pic:

NLP = Naturist Lifestyle Party ( a nudist party, now defunct).

Sylvia was the secretary of the party and stood for election to the NSW upper house a couple of years back.

..... Phil

Software engineering.

It doesn't matter what a software engineer designs, because his/her manager will invariable pass it off as something it isn't.

Sylvia.

--- That's baggage it'd probably be a good idea to leave behind when visiting these groups.

That's because we're all mostly hardware types whose designs speak for themselves without having to be filtered through some sort of "management structure before we post them.

Also, as Larkin posted, there are conventions we follow which tend to make life easier by making drawings less busy, therefore making errors due to cluttering less likely to occur.

As far as being a true negative resistance goes, if you study the LTspice simulation I posted earlier I'm sure you'll agree that it meets your criteria for a _real_ 2 terminal negative resistance.

JF

Yes, though now we're getting down to an argument about the meaning of words, which admittedly I started. Given the overall context of this thread, I think I was justified in objecting to the circuit being described as a negative resistor, even though it's easy enough to see that it behaves like one, within limits, as long as its energy source lasts.

Faced with black box with that behaviour, and asked what it is, few people would characterise it as a negative resistor, in the passive component sense, simply because such a device violates conservation of energy. Presumably most would quickly conclude that the black box contains some sort of active circuit.

And no one would suspect it contained an electric arc.

Sylvia.

Are those two comments related?

I never stood for election, Phil. Try to get your facts right.

Sylvia.

I probably knew what VLF was before you did.

DL and watch.

You obviously didn't get it. Bwuahahahaha!

The term for the day is 'feed forward'.

ope

I'm going to modify it slightly:

The polarity on the op-amp and the values of the resistors are now more like I would do it.

With a heavier load, the switch is on more of the time. While the switch is on, the input of the comparator is higher than when it is off. The result is that the average voltage ends up being higher.

Good one, John. I an quite sure that you are versed on arc characteristics.

Now if only yours, The donktard's, and RoyTard's would.

I'll toke to that!