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Old 19th January 2013, 07:12 PM   #41
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Mooly View Post

(we are all intrigued)
Hi,

No we are not. Some of us are utterly bored. Why explore options for
someone based on some totally pretentious claims, that allow the
goalposts to be moved at anytime depending on the information
received, and excuses as to never define where they actually are.

rgds, sreten.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
 
Old 19th January 2013, 08:08 PM   #42
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Quote:
Originally Posted by Mooly View Post
Looking at this from an entirely different perspective.......
That is a very good approximation. You'll notice that this is not the one I use, yet.

I've been testing and studying this setup for almost a year. If you try different combinations of capacitors, will verify certain nonlinearities at low frequencies (depending on the ratio of capacitors). Try, for example, C1 = C2 = 10 uF. The nonlinearity in this case is about 1 dB. Another thing you can try is to make a sweeping capacitor values ​​and observe how the system behaves, to verify what I say.

This configuration could be used, but with certain restrictions on capacitor values​​.

The configuration that I'm using does not suffer from this drawback.

Anyway, an interesting approach is what you have uploaded.

The blue curve corresponds to what You have kindly uploaded.

regards

Click the image to open in full size.
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Old 19th January 2013, 09:00 PM   #43
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by diegomj1973 View Post
I've been testing and studying this setup for almost a year.
Hi,

You are dull and boring. If you genuinely had something new,
the immensely stupid thing to do would be to come here and
talk about it. * But you don't, but want to pretend you do.

Your just full of smug BS as far as I can tell.

rgds, sreten.

* Chances of anything new are near zero. Nothing much new
in circuit design gets past the 1930's, where the theory did
exceed the devices available, not a problem for theory.
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When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 19th January 2013 at 09:21 PM.
 
Old 19th January 2013, 09:27 PM   #44
GoatGuy is offline GoatGuy  United States
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Ditto, SRETEN, ditto. The "problem" is that I keep getting email that says there are more comments in this miserable thread. The forever-hopeful part of me wants to see Smuggenstein just attach his supposedly magnificent advance in the art of passive-component first-order/second-order IIR filter design. So far, mystery steeped in a sauce of obfuscation and pseudo-intellectualism, unerringly without content.

GoatGuy
 
Old 19th January 2013, 09:36 PM   #45
sreten is offline sreten  United Kingdom
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Default .

Hi,

The "better" circuit will never be posted, its all excuses and BS.

rgds, sreten.
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There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
 
Old 19th January 2013, 11:22 PM   #46
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It is very easy to believe that one knows everything.

It is much easier to divert the topic thread, when no answers.

It is really difficult and laudable recognize the limitations.

It is even more difficult to contribute positively to a topic.

Only those who have contributed positively to this subject have effectively contributed to enrich it. The rest, I do not care.

Each of you will know which place belongs.

regards

Mooly: Thanks again for your contributions and your efforts. That's a great attitude. It is no accident that you are a moderator.
 
Old 20th January 2013, 02:21 AM   #47
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For those skeptics: This new implementation allows us to lower the cutoff frequencies at the low end (with the current values ​​of capacitors) or, better yet, we can use several times smaller capacitors for the same purpose (with all the advantages this implies, knowing of the problems characteristic of large capacitors). These are the more obvious advantages. If the capacitors are several times smaller, we can think seriously about a possible integration of them.

The less obvious advantage (but not least) is a significant improvement in low frequency distortion. To understand this, we must analyze how the signals are arriving by both inputs of the differential amplifier (pin + and -) on the operational amplifier. That is, we have to analyze how these two signals behave versus frequency. The parcial-transfer function to each of these two inputs (from input signal source to pin +, and from opamp output to pin -) must react in a similar fashion versus frequency, abstracting for a moment of what happens with pin + and - in a linear application.

What has been done is to perform an equalization in both signals so that the difference between them be much more constant with the variation of frequency.

That's all that I can tell you.

regards

Last edited by diegomj1973; 20th January 2013 at 02:37 AM.
 
Old 20th January 2013, 07:25 AM   #48
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by sreten View Post
Hi,

No we are not. Some of us are utterly bored. Why explore options for
someone based on some totally pretentious claims, that allow the
goalposts to be moved at anytime depending on the information
received, and excuses as to never define where they actually are.

rgds, sreten.
Quote:
Originally Posted by GoatGuy View Post
Ditto, SRETEN, ditto. The "problem" is that I keep getting email that says there are more comments in this miserable thread. The forever-hopeful part of me wants to see Smuggenstein just attach his supposedly magnificent advance in the art of passive-component first-order/second-order IIR filter design. So far, mystery steeped in a sauce of obfuscation and pseudo-intellectualism, unerringly without content.

GoatGuy
Another thread notifier I'm afraid guys...

Just to say that at the top of the thread under thread tools is an "unsubscribe from this thread" button

If you want to keep posting to the thread then try and keep it constructive.
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Old 20th January 2013, 07:27 AM   #49
Mooly is offline Mooly  United Kingdom
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diegomj1973... I am still intrigued
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Old 20th January 2013, 10:47 AM   #50
Mooly is offline Mooly  United Kingdom
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A little nearer As above but without the 0.1uf so using less parts.
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