John Curl's Blowtorch preamplifier part III

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Do you know what output impedance is? Mind telling us what the output impedance of a good regulator is in the audio band?

As far as I can tell, you're one of the ones here with the least understanding. It's a miracle your products even function.

I think he even does not understand the terms used, their meaning. It is difficult, then, to continue in any kind of discussion with him, as it is reverted to expressions like
I keep pointing out how current measurements ignore the obvious dynamic nature of the music signals which our devices & our ears process
not understanding that "dynamic nature of the music signals" is in fact a trivial stress and that a step change covers all the behavior of the tested regulator - just an understanding of control theory is needed, which can be hardly substituted by listening experience :D
 
But, working with people against their inner conviction is near to impossible for me, so others are much better prepared for that.
Have you ever argued against those with commercial interest? I find them to be the most persistent ones. After all, money is a big motivator.
Preconditions before you're willing to fullfill your obligation? ;)

But anyway, yes, your words in there...and now for the evidence.....
You didn't and still haven't quoted my words like I quoted yours. Accusation equals isn't quote.
 
Shame that you don't understand how easy it is to do these measurements and what constitutes dynamic loads. As in PMA's example a sudden change in current draw excites the entire system, this is basic stuff.

What I suggested was that stability of power was paramount for devices where a reference voltage or ground is essential. This is particularly evident in digital audio devices.

I premised that something in these devices seem to interact with the output stages of active regulators under conditions of dynamic current requirements & this seems not to be the case when passive devices, batteries or supercaps are delivering the current. Voltage regulators between batteries/supercaps & device being powered is detrimental to the sound would seem to be evidence of this.

Plots posted so far doesn't address this.

"So of course I would believe these measurements need to be taken when the device being powered is processing dynamic signals"

The DAC dynamic signal related currents will be a small fraction of the total current draw of the DAC. There is nothing that can be added that good local decoupling will provide and a decent regulator per the data sheet. There are lots of very low uV level noise specified 3.3V regs - see TI, ON et al.

See my post above regarding reguators
 
What I suggested was that stability of power was paramount for devices where a reference voltage or ground is essential. This is particularly evident in digital audio devices.

I premised that something in these devices seem to interact with the output stages of active regulators under conditions of dynamic current requirements & this seems not to be the case when passive devices, batteries or supercaps are delivering the current. Voltage regulators between batteries/supercaps & device being powered is detrimental to the sound would seem to be evidence of this.

Plots posted so far doesn't address this.

You "premised" with no evidence and no understanding of how any of the devices involve behave.

When I am clueless about a topic I try not to propose hypotheses and I read and learn.
 
You seem to think all PhD programs work the same way. They don't.
- At UCLA you can be admitted for a EE PhD without a Masters.
- At UCLA, you can complete a PhD in Mechanical or Aerospace Engineering without ever getting a Masters. You never answered: is that applied science?
- At UCLA (department dependent -but the ones I know), you have 3 main examinations: Written Qualifying within the first 2 years; Oral Qualifying within the first 4; Final Oral Defense after you submit your dissertation to your committee.


I wasn't, but I have no problem admitting when I am. Do you? First, you state no recognized university does it, then you switched to applied sciences, and even that's wrong. Please don't move the goal post again to exclusively EE.

Are you for real? Have you read through the requirements? Do you have any idea what it means to go through admission and yearly exams? In particular for somebody that by self admission abandoned school at 17, before graduating High School?

Aerospace Engineering | UCLA Graduate Programs

Anyway, I will not further discuss this topic with somebody that hasn't ever seen a doctoral school from the inside. Alfred Jarry would be happy to take notes of such a discussion.

We've also wandered away a bit from the from the "bad smell" of John Westlake's Wiki page. You may not like him or what he writes, but questioning his future plans... ? Why?

Tell you why, because I smell a scoundrel, of the kind is over populating this topic.
 
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You "premised" with no evidence and no understanding of how any of the devices involve behave.

When I am clueless about a topic I try not to propose hypotheses and I read and learn.
The evidence is my observations of having done such experiments & I read others on here who have done similar . I take it you never have & have no curiosity to do so.

As always, the arrogant self- regarding cognoscenti bask in their feelings of superiority & yet remain ignorant

I wonder why batteries are still used in instrumentation where sensitivity & stability of the measurements is paramount even when such stellar low noise voltage regulators are available.
 
Are you for real? Have you read through the requirements? Do you have any idea what it means to go through admission and yearly exams? In particular for somebody that by self admission abandoned school at 17, before graduating High School?

Anyway, I will not further discuss this topic with somebody that hasn't ever seen a doctoral school from the inside.
I am for real. I have read the requirements. I have gone through admission. We didn't have yearly exams (other than course exams in each course). Only the 3 PhD exams I mentioned. Are you saying you went somewhere with different requirements... shocking!
Who else were you discussing this with? Even though you are willing to further discuss with me, I'm unwilling to further discuss this with someone so pretentious and ignorant.
 
I wondered how old y’all were....theres a bitterness that could only come with those numbers (loss of eyesight,hearing,motor skills and what not) I’m 54 and see these things catching me in the rear view......I do appreciate the insight to the future.:p

Hearing still holds to 13-14kHz, not too bad re my age. Eyes ok, mobility as well (going to Alps soon), however some coronary issues :D
 
Reassure me, it's second-degree humor, is not it?

It's know as scientific relativism, someone randomly soldering circuits together relying on their "ears" as only test instrument is on equal ground with anyone else. More importantly we have to read 500 pages of literature on proper psycho-acoustic testing and religiously follow the protocol specified to even question their results.
 
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