John Curl's Blowtorch preamplifier part II

[simon7000]

John,

The thread stays up for many to see who do not comment. There is not just technical information here, but a good commentary on style.

I have not expressed my opinions on the personalities in public, that does not mean I do not have them. When I see someone "add" to a topic under discussion that is in an area I have explored, I just smile to myself when they show complete ignorance and pretend they are contributing.

The reason why you should continue is that although some here may think you are in error, time and additional work may show them to be in error.

I of course never make mystakes.

ES

[syn08]

Originally Posted by john curl

I suspect, Joshua, that you understand me, and while we have never met in person, we have talked on the phone.
You are also an admitted 'technician' that I have come to believe actually essentially understands what I am trying to say here. Trust me, that is a relief, when I get so much 'static' from many others.
I try to convey, without math or schematics, HERE, because I have no good and direct way to put them up. Also, I don't like to publish my latest schematics, or even patent #'s by others, as this leads to intellectual loss of trade secrets, that my associates and I don't want to give it out to our direct competitors.
Also, most of what I wish to convey here to 'help' others is expressed as ideas, anyway, unless someone demands PROOF! Well, take it or leave it, everyone, I can't give more info. than I give. If it is not 'enough' then change to another thread. Is that so hard?

In fact it is very

[GK]

????

:d

[Joshua_G]

John,
I said before and I'll say it again.
After 45 years experience in electronics and audio, from your input in this thread, I learned about SOTA audio gear more than in any one other single place.
Your voice is not lost in the wilderness.

We all are temporary passengers in a space ship called Earth, traversing space at enormous speed, going nowhere.

[Bob Cordell]

Originally Posted by john curl

This happens a lot in my world, also, Wavebourn.
For everyone else, I don't know what to say about the inductance variation. It can be very important, I'm sure.
However, I am in a situation where I can't address this topic here.
I will try to continue on a separate topic, once one comes up that I can contribute to.
It is interesting that I brought up this topic with one of my associates, and he said 'What inductor is actually linear? Apparently he has looked deeper than most, but I brushed it off, saying that we have to use 'something' and air coil looks pretty good to me, compared to many other types.

Hi John,

That's right, an air core inductor for the output filter of a class D amp will help eliminate PIM caused by the inductor. The air core takes up more room, but can probably justified for a high-end class D amp. Make it a toroid air core to better confine the magnetic field and EMI.

Cheers,
Bob

[Lumba Ogir]

Glen,
who`s that fair lady? Condi Rice?

[andy_c]

Originally Posted by Bob Cordell

Make it a toroid air core to better confine the magnetic field and EMI.

Bob, I have a stupid question. How does one wind an air-core toroid? Or more specifically, isn't there a problem removing the form? I'm thinking of this in comparison with the solenoid case where the form might be, say, a dowel which you can just slide out when done winding.

[MJL21193]

Originally Posted by andy_c

Bob, I have a stupid question. How does one wind an air-core toroid? Or more specifically, isn't there a problem removing the form? I'm thinking of this in comparison with the solenoid case where the form might be, say, a dowel which you can just slide out when done winding.

The lost wax method...

[anatech]

Hi Joshua,

Who appointed you to "help" others against their will?

All you had to say was that you disagree with me. But then again, John does need his glee club, and you seem to need a mentor for some reason.

Tell me, what have I said that was untrue?

Over the years, I have helped many people. True, it was without asking permission to help them first. I guess I'm that kind of guy.

Who appointed you to determine for others what's right and what's wrong for them, what's good and what's bad for them?

I haven't done that. I have made some observations and no one is bound to take my advice unless I post in an official capacity. You will note that I seldom use "the hat".

It is possible your mentor may have been distressed a little.

Who appointed you to educate others?

Now, there is a curious statement!
It is up to people experienced in the industry and art to help pass on what they have learned. Civilizations build on the knowledge of those who came before them. Being a good member here means that you assist and contribute.

My take on all this is that you have a problem with the exchange between John and I. Let it be said that I'd much rather learn from a helpful and cheery person, but alas, John ain't that person.

Don't you see you are a self-appointed righteous?

I guess I am to a degree, but I have never tried to be anything but helpful except when I see a need to stand up for our membership. So, how are you going to enrich the experience here Joshua?

I love to see all you may contribute to technical issue.

Well, just go ahead and read in other posts. I must admit that I am unable to post as much as I used to do though. I'd like to see you post things that are generally correct, not unless your experience and knowledge is also a secret. This, I just have to see for myself Joshua!

When you have nothing technical to contribute – do what's appropriate in such cases (shut up?).

The cool thing about rules is that they apply to everyone Joshua. Which means that if we did apply this suggestion of yours, you would be unable to post most of what you have, and John would also have the number of posts he makes greatly curtailed.

A suggestion for you Joshua, think ahead before your fingers strike the keyboard. Try and contribute to some threads, rather than attack a perceived foe.

We all are temporary passengers in a space ship called Earth, traversing space at enormous speed, going nowhere.

From where I sit, that pretty much describes your contribution here!
Again with the fingers! Think first old boy.

-Chris

[anatech]

Hi John,
I really was going to ignore this thread for a bit, waiting for some science or truth to be tabled, but your "bodyguard" came out to play and you went for the sympathy vote. You never change and it's so very transparent.

I am only out to make sure your claims are true.

I try to convey, without math or schematics, HERE, because I have no good and direct way to put them up.

Now, this is hogwash.
You are trying to convey information without math or schematics so you can't be tripped up. If there is no information to work with, you can't be proved incorrect. That, is the real reason for no schematics, which leads to no math. Is one to assume that you do release schematics on some public forum somewhere as you are inferring?

You have received offers to help post your material by more than one member here. I have been one of those people, so I know that you do not pursue anyone's offer to assist you. So this entire statement is patently untrue - call it what you will.

Also, I don't like to publish my latest schematics, or even patent #'s by others, as this leads to intellectual loss of trade secrets, that my associates and I don't want to give it out to our direct competitors.

Fact: Patents are public knowledge and your competitors are far better at mining the patent office for information than people will be here as a group.
Fact: If you had any patent information worth protecting, it would be filed under your name, an easy search. The information is not in your name. You did not invent the secret you say you are protecting. That makes sense if you consider most new developments are rehashed old ideas.
This statement is just a smoke screen John. Maybe you don't want the patent holder to realize you are infringing on their patent.

Just guessing here with logic. Why else would anyone hide the IP they have "patented" which is easy to find? John, I am dying to know the real reason, because your stated reason doesn't hold water.

Also, most of what I wish to convey here to 'help' others is expressed as ideas

...And a schematic is a form of design shorthand that most of us can read. Posting a schematic to illustrate an idea is a time honored method used to teach others a concept. Block diagrams are often used as well.

Well, take it or leave it, everyone, I can't give more info. than I give.

Once again you have trouble with the English language John. No, it's more info than you will give. It's an entirely elective thing on your part. This is the way you have looked at your involvement for years.

If it is not 'enough' then change to another thread. Is that so hard?

They did, and you showed up there as well.

More basic is the requirement that if you make a statement, then it is entirely up to you to show evidence supporting your viewpoint, unless it is a basic thing that is accepted generally. I had to put that in for Joshua there.

So, why would anyone begin another thread to discuss anything that you advanced and refused to support? Does that make any sense to you, because it sure doesn't make any sense to me.

John, I'm really sorry and depressed we don't get along better. Everyone here who doesn't agree with you is seen as your antagonist, and that's sad. It's also untrue.

Here's hoping you find a technical topic that you can discuss without limits and secrets.

Hi MJL21193,

The lost wax method...

Ear wax!


-Chris