Re: 80dB now but still needs improvement at 1KHz

On 6/11/2024 8:43 pm, Jan Panteltje wrote:

On a sunny day (Wed, 6 Nov 2024 20:06:20 +1100) it happened Bill Sloman
<bill.sloman@ieee.org> wrote in <vgfbii$21t2e$1@dont-email.me>:
 

On 6/11/2024 6:07 pm, Jan Panteltje wrote:

On a sunny day (Tue, 5 Nov 2024 11:00:42 -0500) it happened "Edward Rawde"
<invalid@invalid.invalid> wrote in
<vgdffb$ibt$1@nnrp.usenet.blueworldhosting.com>:
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"Jan Panteltje" <alien@comet.invalid> wrote in message news:vgccvm$6jk3$1@solani.org...

On a sunny day (Mon, 4 Nov 2024 11:31:01 -0500) it happened "Edward Rawde"
<invalid@invalid.invalid> wrote in
<vgass6$28u2$1@nnrp.usenet.blueworldhosting.com>:
>

"Jan Panteltje" <alien@comet.invalid> wrote in message news:vg9pnu$ekhh$1@solani.org...

On a sunny day (Sun, 3 Nov 2024 23:06:04 -0500) it happened "Edward Rawde"
<invalid@invalid.invalid> wrote in
<vg9h7b$277o$1@nnrp.usenet.blueworldhosting.com>:
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Simulation isn't fast but if you let it complete and do an FFT on the last 30 seconds, it's 80dB down at all unwanted
harmonics.
There do however seem to be unwanted sidebands close in either side of 1KHz
Any suggestions for improvement?

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Publish a circuit diagram.
Not that hard to make !

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If you mean ASCII art, no thanks in the case of this circuit.

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Easy to make a screen shot of your spice circuit and upload it one of those free image publication sites
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You do not seriously expect readers to start ancient peesees and use millisoft widows emulators to run tea spices
https://panteltje.nl/panteltje/scope_tv/diagram.jpg
https://panteltje.nl/pub/swr_bridge_hl_lt_spice.gif
>

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These appear to be LTSpice, so why can't you use it to view my circuits?

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As I pointed out, am reading Usenet on a Raspbeery Pi4 8GB
Does everything here from spectrum analyzing to audio to video play
Why boot up an acient peesee to start a millisoft widows emulator
to look up some 80 deebee thingy that likely never has a practical use?
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In any case if you can't simulate my circuits you won't be able to appreciate how brilliant a designer I am like Bill does.

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80 deebee makes me wonder if you not better spend your time on making e-bikes from vipes...
   com/gadgets/2024/11/disposable-vapes-from-a-music-festival-can-power-a-beefy-e-bike-20-miles/
   And elteasprites simu is not worth a thing, reality is different from the models used.

 I sometimes compare the ElTeaSPrites to a mathematician trying to play tennis
Faster all the things.. The human neural net plays score after score
while the mathemtician is still simulating the first backhand..

Not if he's got a decent conmputer to run his simulations.

Bit elated I am as Trump is winning :-)

It does look that way. Your elation will fade as he starts implentming his silly ideas

Maybe ends the Biden war making for money game.

Trump persuaded Putin that he could get away with invading the Ukraine. Biden got elected a long time after Putin had started encouraging pro-Russian insurrections in the Ukraine, and Trump was impeached for attempting to influence Zelensky by threatening to hold back military aid that the then Repulicna dominated US Congress had voted to send them. You are quie a fond of fatuous nonsense as Cursitor Doom.

Not all that different, and you can test a new idea in LTSpice a lot
faster than you can cobble stuff together on the bench.
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I stopped using it long ago (years).
My stuff works.

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Because you don't try anything new?

 Very little is 'new'.
My neural net has been trained on electronics since the early fifties of last century.

Mine too. LTSpice isn't any kind of neural net.

ELTheaSPice is just a word...

It's quite a few words of computer program.

Used it once to check some filter curves, but there are better filter programs.

Of course there are - LTSpice is a simulation program, not a filter design program.

It gave the wrong results on a simple amplifier I tried on it.

So you didn't use it correctly.

It is extremely limited and again compare it to the tennis player that trained a lifetime
a joke basically.

Far from it.

Get into the very high frequency domain, did a lot of that stuff, it is then more about layout and wavelength and similar stuff
how circuits behave.

Been there, done that. LSpice isn't designed for that kind of work, though it does offer lossy delay line models. At high frequencies layout is all about stray capacitances, which you can model in LTSpice, but it gets very messy for anything complicated enough to be useful.

ElTeaSprites is a bit like Hollowwood movies.

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Hollywood movies are expensive. LTSpice is free.
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Burb .. I mean Kirk.. well
I do not question your genius,

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Sci.electronics.design does seem to be a genius-free space.

 It is design, if it works what is cooked up here, great!
Sure got some interesting ideas from here that I tried.

Design is a bit more than "cooking up stuff". It helps if you understand what you are doing and what you are trying to do.

There are
quite a few competent people who post here, but genius is rare, and most
of the people who are called geniuses have exploited a stroke of luck
that let them look better than they deserve, though as Pasteur said,
chance does favour the prepared mind.

 My interests are much wider than electronics
worked in many fields
from electronics to TV to power stations to medical to aircraft to satellite ..what not.

Who hasn't?

Plowing through a lot of circuit variations quickly with LTSpice does
give you more chances to win that particular lottery.

 Sounds like gambling...

It might, to you.

these days AI is using that method to try a zillion variation in medicine related creations.

It's called the Monte Carlo approach. There are more systematic approaches.

It may or may not work.
But _understanding_comes first and is always the winner.
Lucky shot may help too.
 There is nothing you can not do if you are sufficiently motivated.

Twaddle. Excessively motivated people thrash around getting nowhere.
As you say, understanding is the key, but LTSpice - in the right hands - can help you understand what's going on on the bench quite a lot faster than bench work on it's own.
--
Bill Sloman, Sydney