John Curl's Blowtorch preamplifier part II

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It was culled from posts here, with all other posts, replies, comments, opposite views etc deleted. The mother of all censorships.

jan
Hello Jan,
I don’t know why you pull this crap again. As I’d already stated
1) I didn't have permissions from other posters to compile their so-called ‘comments’ ,
2) I’d had no interest in other person’s opinion.
Please be professional
 
Jan, it was all unravelling right in front of my eyes, even if I was separated from her by a glass window, as I was in the visiting area. The odd thing is, it all took no longer than say 15 minutes to happen, but it flashed in front of me like it was seconds.

What is really frigtening about it all is the realization that she is alive today thanks to sheer luck that the fisherman-doctor just happened to be there.
A remarkable story, dvv, thanks for sharing it here ... :yinyang:
 
cliffforest,
I guess the satire got past you on the ice comment!

DF96,
The problem with those old painters making their own pigments was the simple fact that so much of it was dangerously toxic. might explain some of the strange things some artist created later in life? The old saying was "mad as a hatter" due to the toxic chemicals those old tradesmen used in the past.

Hey! You talking about Mr '8 Legs' Scott W.? [and No - it wasn't a spider which crawled across his canvas!];)
 
Therefore discoveries can & have been made by accident, for eg, AGB & the telephone.

Probably not the best example...

Take your own field. What is the chance that anyone, looking casually at some of your projects without really understanding the ins and outs, comes up with a complete new and improved way of doing it?

jan

Knowing Patrick, statistically tiny...

Things are so complex today that innovation is not often a one person thing. There are greats, no doubt, but innovation and unique ideas can come from unlikely places. Sure there are many that have no clue and yet espouse that they do. We should not to use Patrick or Nelson as examples to discount that there are learning opportunities and possibly great new ideas from unlikely sources. Small details or contributions can mean a lot to achieving that completely new way of doing things.

Here's one to think about - What about the things we wish we could uninvent.

Dave
 
AX tech editor
Joined 2002
Paid Member
Hello Jan,
I don’t know why you pull this crap again. As I’d already stated
1) I didn't have permissions from other posters to compile their so-called ‘comments’ ,
2) I’d had no interest in other person’s opinion.
Please be professional

Well Dimitri I just think that if you have a conversation with different people, different opinions, you know, a conversation, where one remark brings an idea to another guy and vice versa, and then take everything from one specific person and leave out all the rest, that isn't right. That is shortchanging all the others who put in their points and comments which together lead to the end result.
I'm not blaming you specifically - it's Johns stuff, and if he feels it is not right he should tell you to delete it, not cowardly hide behind your back and blame you. But that's par for the course.

Jan
 
Does any one have an idea of what the thinnest copper thickness being used on pcb (for audio) from Asia/Japan compnaies??........ receivers, amps etc.


THx-RNMarsh

I was told (by a PCB specialist) that standard quality assumes 30-35 microns, better quality 50-55 microns, and the best goes from 70 microns and up. He said the best he's ever seen were 120 microns.

Modern Asian products generally stick to the 30-35 micron norm if they are owned or doing OEM for somebody outside of China, but the word is 25 micron boards have appeared from China. Not confirmed.
 
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I was told (by a PCB specialist) that standard quality assumes 30-35 microns, better quality 50-55 microns, and the best goes from 70 microns and up. He said the best he's ever seen were 120 microns.

Modern Asian products generally stick to the 30-35 micron norm if they are owned or doing OEM for somebody outside of China, but the word is 25 micron boards have appeared from China. Not confirmed.

Thank you. That is very helpful info. No wonder their traces lift so easily when replacing parts!!
I'll use info and try to get some samples and do tests with the the standard quality thickness.

Where can I get samples of blank pcb of these thicknesses?

-Richard
 
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@ jcx

Hi, Thanx for the link which had info etc in there that i wasn't aware of before.

@ jan.didden

My MAIN point though was about people who don't know as much as some others, but are able to come up with new ways of doing things & inventions etc, that are better etc, often by accident etc or just by tinkering or fortunate mistakes.

My Alexander Graham Bell example was based on my reading & hearing over the years that he improved his device into a working prototype, due to him spilling some fluid over it, even if he didn't actually invent the TP.

Originally Posted by jan.didden

It was culled from posts here, with all other posts, replies, comments, opposite views etc deleted. The mother of all censorships.

Yeah i realised that, but it gives me JC's viewpoint etc on things, & has some good info included, which is what i wanted.

As i said "A number of things in there i could bring up, but it'd just be rehashing previous discussions etc !"
 
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