OT: New book "The Long Thaw"

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Not actually a logical deduction from what I wrote, but we all know how your mind - such as it is - works.

Here you go again. In fact you don't use logic, you can't understand reason, and you haven't got a character to assassinate.

How surprising that you - of all people - would think that.

-- Bill Sloman, Nijmegen

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Pretentious twaddle.

And was - equally obviously - a comical way of getting around to mentioning your - comical - problems.

As, as usual, the message that you bring is that you don't understand what is going on.

That would be your cognitive disorder making itself obvious.

John Fields provides another example of how he fails to understand what is going on.

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How much do you have to pay for these refinements? An A/D converter fast enough to sample a 35psec edge isn't cheap, nor is it easy to put it on a circuit board in a way that will let you take full advantage of all the speed that you are paying for. John Larkin talks about using a sampling circuit to pick separate bits out of the reflected waveform from successive pulses. This lets you use cheaper hardware behind the sampling circuit, but it needs rather more pulses than you can quickly get out of a mercury wetted relay.

Not exactly. It's got rather too much in common with using a stroboscopic electron microscope to pick 0.5 nsec data samples off the surface of a lidless working integrated circuit - quite the biggest and most expensive sampling head that I'd ever worked with.

The "slow" A/D converter in that system was good to about 100MHz and the RAM as well as the digital signal averaging logic that up-dated it was ECL. These days you'd use a big, fast, programmable logic device for the buffer RAM and the signal processing logic, but this was

-- Bill Sloman, Nijmegen

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Perhaps, but you've not tied your "weaker" and "stronger" non- linearity to any such polynomial.

But the equations have precisely the same form, if rather different constants.

Talking about "weaker" and "stronger" nonlinearity when you are making a distinction that only involves the size of the constants in the equations is revealingly pretentious.

They certainly don't have the same significance as the presence or absence of higher-order terms in the polynomials.

-- Bill Sloman, Nijmegen

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Sure. There are competent meteorologist around, but because you local paper won't pay for their services, and instead buy their data from somebody who doesn't cost much, you want us to believe that the whole of climate science is equally lousy.

-- Bill Sloman, Nijmegen

The dipsy-doodle Larkinesque defense ?:-) ...Jim Thompson

If you are game to assume enough about the incoming edge/pulse you could differentiate it, and solve the problem that way, but that does make "designing a lash-up" look more like a system design problem than the phrase "lash-up" would suggest.

An edge may be an edge regardless of its slope, but if you want to differentiate it to cover for the 555's inadequacy, you need to have a lower limit for that slope. That is the kind of requirement that might discourage someone from using the 555 in a lash-up.

-- Bill Sloman, Nijmegen

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My favorite (cheapy) noise blanker/debouncer:

I do something similar in custom chips, but simply use a VTH off of each rail as the "set/reset". ...Jim Thompson

Thanks! Actually been using similar window comparator schemes since the mid-'60's, first use: filtering automobile ignition system pick-ups :-) ...Jim Thompson

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Indeed! I don't recall ANYONE ever coming to Sloman's aid on any electronics newsgroup.

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In fact your mind doesn't work all that well, and one of the results is that you see "subterfuges" that don't actually exist.

-- Bill Sloman, Nijmegen

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And when have I ever needed help?

-- Bill Sloman, Nijmegen

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Proof - in the sense of convincing other people - would be an unnecessary waste of bandwidth. A proof that would convince you is impossible, because you aren't equipped to comprehend it.

-- Bill Sloman, Nijmegen

: >John Larkin wrote: : >: And none of the nodes of an opamp-based chaotic oscillator will ever : >: go beyond the supply rails. : >

: > Exactly! You got the point. This is your power constraint.

: In our business, we'd call that a voltage restraint.

: >

: > You, as an intelligent designer, have gone through great pains to : >provide a stable supply to your Chua's circuit (or whatever), chose : >a good regulator, made sure that bypass caps are sufficiently large : >and so on. : >

: > But you also could have made a poor supply design, one that oscillates : >in a deterministic manner, or has a lot of 50 Hz ripple, or whose : >voltage drifts when room temperature goes up or down, or whose output : >contains a lot of thermal noise. If your supply circuit is complex enough : >(three degrees of freedom + nonlinearity), it may even show chaotic : >behaviour.

: Point?

: >

: > There is no guarantee that Mother Nature is as good a supply designer : >as you are. In particular, by simply observing the short term behaviour : >of Her chaotic oscillator it is not obvious whether Her power supply : >is following a complicated (but predictable) oscillation waveform or : >whether it is chaotic. : >

: >: Yes, but the difference between 7 and 40C *matters*. As does the : >: difference between a warm period and having most of North America : >: covered by glaciers. : >

: > That's climate, I don't want to open that can of worms in this context. : >

: >I just wanted to say: you cannot argue that the long-term statistics : >of a system are necessarily unpredictable, solely on the basis that its : >short-term behaviour is chaotic. You need to know something else about : >the system.

: I never did. I said that the *state* of a chaotic system, at some

True. I tried to write in passive, I should have written "ONE cannot argue that the long-term statistics..."

By the way, can you recommend clever and though-provoking newspapers closer to the "right-wing nitwit" end of the spectrum, ones worth taking a glance? I have primarily exposed myself to "leftist weenie" ones. You mentioned NYT which I occasionally read (mostly IHT, actually), which is good but I think considered quite liberal. I have noticed that Fox news is a waste of time, are there others? The Wall Street Journal and Financial Times I've browsed sometimes.

Regards, Mikko

If your hookup looks like this:

.Vcc>-----------------+-------+--------+----+ . |R3 8| |R4 | . [910k] +---+---+ [1M] | .__ Rt| 2|_ Vcc _|4 | |C3 .IN>------------------|--O|T R|O---+ [100nF] . | 6| | |C4 | . +---|TH 555| [10nF] | . | 7|_ |3 | | . +--O|D OUT|O---|----|--->OUT . +| | GND | | | . [1µF] +---+---+ | | . Ct|C2 1| U1 | | .GND>-----------------+-------+--------+----+ __ and IN lasts longer than OUT, then the timing will look like this:

t0 t10s __ ____| |_______ IN |__________________________________|

__________________________________ OUT____| |_______

While if the lashup looks like this:

.Vcc>-+---------+-----+-------+--------+----+ . |R1 |R2 |R3 8| |R4 | . [10k] [10k][910k] +---+---+ [1M] | .__ | C1 | Rt| 2|_ Vcc _|4 | |C3 .IN>--+-[100nF]-+-----|--O|T R|O---+ [100nF] . | 6| | |C4 | . +---|TH 555| [10nF] | . | 7|_ |3 | | . +--O|D OUT|O---|----|--->OUT . +| | GND | | | . [1µF] +---+---+ | | . Ct|C2 1| U1 | | .GND>-----------------+-------+--------+----+

then the timing will look like this:

t0s t10s __ ____| |_______ IN |__________________________________|

___ OUT____| |______________________________________ | t1s

WHY is Fox News a waste of time? Presents material that your pea-sized socialist brain can't cope with ?:-) ...Jim Thompson