Re: Oscillators in LTspice

On 25/10/2024 7:16 am, john larkin wrote:

On Sat, 19 Oct 2024 15:20:49 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
 

On a sunny day (Sat, 19 Oct 2024 07:39:16 -0700) it happened john larkin
<JL@gct.com> wrote in <5og7hjhgc0am8m1lqmfhfufsok44en4bc5@4ax.com>:
>

On Sat, 19 Oct 2024 05:33:51 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
>

On a sunny day (Fri, 18 Oct 2024 16:33:22 -0000 (UTC)) it happened Cursitor
Doom <cd999666@notformail.com> wrote in <veu2ki$3cmo3$1@dont-email.me>:
>

Gentlemen,
>
I've never spiced an oscillator AFAICR. Do they self-start in spice
simulators (LT in particular)? IOW, did Mike Engleheart build something
into the engine which generates wideband 'background' noise, particularly
at 'power up' as it were? I'm assuming there must be some such mechanism
and if there is, it must be present by default for all schematics one
attempts to simulate and not just oscillators?

>
Often, if not always, it is simpler to just solder a circuit together and measure it, than that ElTeaSpites jive.
Tried it, have it on a Linux PC, it did not give the right waveforms
lacking accurate models, and environment awareness. peeseebee, housing, cables, what not.
Used it for some LF filters as that saves math, but there are much simpler filter design programs
that do the same and better, just display the curves.
>
ElTeaSpites has become a religion...
Just use a soldering iron and a good scope, maybe also a spectrum analyzer and you have certainty.
I have done LF and GHz stuff that all works that way,
And you will need the right model for ElTeaSpites (always incomplete) and need to measure anyways.
ElTeaSpites sucks anyways when you add microcontrollers and those are everywhere,
You should be OK with all your boat anchors doing good measurements.
Modern stuff uses chips that give very limited info about what's in those,
you will need the right model for ElTeaSpites (those are always incomplete) and need to measure anyways.
Just test small sub-circuits and put it all together.
An alternative would perhaps be to as AI to design stuff.. save a lot of the time to get familiar with the ElTeaSpites.
>
Is that where it goes for electronics design? AI?

>
It's sometimes hard to understand your pun spelling meanings, maybe
because you are not a native English speaker. Foreigners who try to
pun in English are often ludicrous. I was at a giant gathering at a US
national lab and some French bigwig tried to pun in English. There
were about 2000 instances of dead silence. I almost felt sorry for
him.

>
Being single language like many 'merricans limits IQ and comprehension in a big way.
>
>

LT Spice is wonderful. Usually I can go straight to a production PC                         ^^^^^^
board from a good sim.

>
I am multi language, sometimes I think in Dutch, sometimes in English, sometimes in German
and was even singing a French song yesterday..
It is very helpful when scanning the media...
>
Dutch French English and German are at least required in high school here.
When I was still designing for a company there were no lLTSpice.
Don't drink much tea anyways these days, not even coffee, chocolate yes.

 I'm working with a PCB layout guy who is great with placement and
routing and such, but terrible at following written directions and
with spelling and reference designator placement. In other words, very
visual but not very verbal. Not a native English speaker.

There are native speakers of English who are more visual than verbal.
I knew one brilliant engineer who was so verbal that he couldn't see the point of spelling "their","there" and "they're" differently because they were all pronounced indentically. I once offered to check his text for him, and he rejected the offer because he couldn't see the point.

I suspect that the Roman character set and decimal number notation
affect the way people think and get some credit for the Enlightment
and for the technical progress of western countries.

Not an opinion shared by the kind of visual psychologists who think about that kind of stuff.

How do Chinese companies do their reference designators? All the stuff
I've seen looks very western, not Chinese characters, except that the
prefixes are arbitrary, like TR for transistor, or TR for transformer,
whatever.
 The Chinese and Japanese and some other char sets need high resolution
too. Our smallest ref desigs are 50 mils high, which works well with
modern inkjet printing.

Korea, Thailand, and the Arab countries all have their own character sets. Japan has three. The Cyrillic alphabet is pretty close to Latin and Greek (because it evolved from them).
The basic fact that human languages all use a limited number of phonemes (drawn from a common stock of about 200 which pretty much every human can produce and distinguish) pretty much defines how writing works.
The practical details get messy.
--
Bill Sloman, Sydney