a question about resistors in an arc experiment

There is a tendency for the "boys" here to gang up on and try to chase women away; it's happened several times before.

I'll certainly debate you about circuit theory, or even programming, but I can't imagine why these guys feel so threatened that they have to act the way they are doing now.

It all mystifies me.

And, for the record, I *like* most all women. I am attracted to the thinner ones, which is just chemistry.

Oh, I was describing my ideal, verbose, safe, boring programming language to a guy last week, and he said "Oh, that's ADA." He also said that VHDL is based on ADA, which may explain why hardware is so good and most software (C, C++) is so bad.

I've got to read up on ADA. Most of the stuff that runs airplanes is coded in ADA.

Grumble, snarl, back to my program, up to 5762 lines of assembly so far.

John

Can't be bothered. If you have a point to make, then make it. Otherwise shut up about it.

Sylvia.

Just trying to give you a hard time... this is, after all, your initiation period ;-)

...Jim Thompson

And YOU have advanced our knowledge how?

(Not at all, actually. We're just feeding you rope from which to hang yourself ;-)

An arc _does_ have a negative resistance _region_.

...Jim Thompson

Yup, if LT Spice is broken we both save face.

There's a more fundamental way to look at this circuit. Treat the source V3 as a battery. If V3 is 12 volts, and the circuit indeed pushes 12 mA *into* V3, then the battery is being charged. That makes sense: a real resistor discharges a battery but a negative resistor charges it.

So this circuit, one LTC opamp and four resistors, is delivering power into V3. It's a perpetual motion machine.

John

Yes. Thankyou. That was never in dispute.

Sylvia.

Arlo is great. He's funny, curious, self-effacing, and you can tell he really likes people of both polarities, all of which have kept him from being a big popular success. His movie "Alice's Restaurant" is wonderful.

So many pop musicians have been blatant misogynists. It seems to sell records.

John

Then you're wasting your time. I've been in NGs that make these look like bastions of civilised debate, despite Phil's presence.

Sylvia

And JFs circuit doesn't work.

John

That explanation doesn't hold water. If the difference was the language, explain Verilog? While VHDL is based on ADA, Verilog is quite 'C' like.

Then, of course, there is System-C, which is supposed to make hardware designers out of script kiddies. :-(

I'm with you on assembler (though not 68K) and VHDL. ;-)

Phil is sort of the backround music, a kind of profane Muzak.

John

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That depends on which sort of negative resistor you are talking about. There are two types. Both obey Ohms law but they are very different creatures. Both can be used to cancel out the real resistance in an RLC tuned circuit.

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Yes gulp! I've even met one of the guys who wrote some of the code. No thanks I'll drive.

How much code space does the micro have? That will tell you when you will be done. :)

Nah, that's only the start of the fun.

That reminds me of a tale about a number of University Computer Science professors being asked whether they'd be willing to travel in an aircraft whose flight software had been written by their students.

All except one said "No way".

When the stand out was challenged on his reasoning he said "It's because I'm quite sure it won't get off the ground in the first place."

Sylvia.