John Curl's Blowtorch preamplifier part II

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JN,
Does that legal department prevent you from doing any published studies outside of your everyday job function? I understand that many companies hold complete control over any IP that you may have as long as you are in their employ, so I am sincerely asking if you are allowed in any way to do any published basic research? I know I have had to sign those types of NDA papers more than once with stipulated minimum amounts of years before if ever anything can be discussed or disseminated. It is a real impediment to sharing knowledge.
No. The only issue is if they own the IP. The line of distinction is actually quite hazy when it comes to magnetics, wire coupling and such. They have much more flexibility when I do papers or presentations on wildly different things like semiconductor thermal analysis or wooden gear clock manufacturing or isochronism technology of various escape mechanisms for clocks, less flexibility when magnetic design and testing is involved, and even less if superconductors or nanotech stuff is involved. Ground loop and t-line stuff, I've never tried to push that envelope.

jn
 
JN, I think that some of your reports on 'coil winding' were once available.

They might be. In the early days when they actually decided to put a web page together, I had to put up 6 or 7 different web pages with writeups for various projects. But over the years they change the site, so lots of it tends to get put where only internal access is possible, or from other labs.

Nowadays, I've no idea what the IT guys are doing.

ps..but honestly, that stuff is really only useful if you suffer insomnia, it's rather audience specific.

jn
 
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Ed, another point..

JN,
I have measured the crosstalk between my woofer amps and tweeter amps on site. However as mentioned wind noise makes it tough. But from a cable connected to a tweeter while music was playing the meter bounced around up to 3 volts on an analog meter.
When you did this, you had the amp end open I assume. The next time you are dealing with this, try loading the tweeter cable at the amp end with a few different resistance values, and plot the voltage vs resistance. That way you'll be able to put a thevenin equivalent, as well as determine the coupling constant vs frequency. You'll be able to get a better feel for what type of coupling it really is, mag or ele. If it's mag, you'll have more current with the line loaded, as e coupling will simply die out under load.

I'd love to know.
(50+ woofer amps each sourcing 500W max. into 8 ish ohms.)
And yet your guy wires that as LV? Aside from code worries, I'd also think ampacity.

jn
 
Nope.
Although I also get a kick out of everybody playing that man month thing around, in reality, if JC simply started providing data without experience on the machine, I'd probably be at the top of the pigpile.

He already did. Don't remember those tantalum capacitor measurements he tossed out a while back?

Say it with me now. "Man months." :D

se
 
It takes 'man-months' to learn a sophisticated piece of test equipment well enough to do something original and exotic with it, and that is what I hope to do. It would be a waste of time and money to attempt less.

"Exotic." That's right up there with "quantum" and "nano." Just more smokescreen BS for the rubes.

I don't care what piece of equipment you've got, it doesn't take spending over 720 hours with it to learn how to use it.

To put that into perspective, to achieve one man-month, you would have to spend eight hours a day, seven days a week for three months doing nothing but learning to use the piece of equipment. And that's just one man-MONTH, not "months" as you have kept saying.

You're certainly not spending eight hours a day, seven days a week learning how to use your new toy, so in terms of actual time, I guess we can't expect to hear anything from you for at least a year or more.

And all this just to measure A BLOODY CABLE!

se
 
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