Good Lord, AlwaysWrong. Learn to read!
Good Lord, AlwaysWrong. Learn to read!
You're always wrong, AlwaysWrong.
No, I was not an IBM Fellow. Just a design engineer. Idiot!
You're still AlwaysWrong.
It can make all the Johnson noise it wants to, I'd have a perfect business model for those and would soon retire on my own island, including landing strip and private jet :-)
-- Regards, Joerg http://www.analogconsultants.com/
On Mon, 01 Jun 2015 12:35:32 -0400, krw Gave us:
snip
It is a modern world, child. GOLD IS the "proper way", dufus.
Even my motherboards use it, and now you are going to tell me it costs so much more? If it did, they would not be doing it.
Purely imaginary, of course. ;)
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant
On Mon, 01 Jun 2015 14:34:36 -0400, Phil Hobbs Gave us:
Unless you are in Rock Ridge. There is a huge amount of Johnson noise there, regardless of the resistance value. :-)
The line was designed and set up by experts. And it's operated by experts. We prefer a few microinches of flat gold than some random number of mils of bumpy, crufty, tarnished ROHS solder.
750 pin BGAs, and lots of other things, solder better to planar, gold pads.-- John Larkin Highland Technology, Inc picosecond timing precision measurement
Mhos are cheaper and work just as well.
-- John Larkin Highland Technology, Inc picosecond timing precision measurement
Am 01.06.2015 um 17:53 schrieb John Larkin:
.. and if you have 50 Ohms and -50 Ohms in series, I'd bet that not many simulators get the noise right thanks to node collapsing?
regards, Gerhard
Except that they aren't ROHS.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant
Siemens may be, but they might not meet with biohazard safety rules.
Tim
-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design
You are such a trip... lol
-- Rick
According to politicians and federal bankers there would be no node collapse as this would still total about +32 ohms. Or over +60ohms in Greece :-)
-- Regards, Joerg http://www.analogconsultants.com/
No it doesn't. One of the very big contract manufacturers in the UK prefers to use bare copper with a protective organic coating for lead-free. They have no problems with this.
Too much gold is a bad thing, as it forms a brittle inter-metallic compound with tin which can reduce the reliability of the solder joint.
See for example
John
Are you sure you haven't got that backwards?
Cheers, James
Check this out. I found an online calculator to help convert between the two. Pretty cool, eh?
-- Rick
Opps, forgot the link...
-- Rick
all the coatings have pros and cons
-Lasse
the two. Pretty cool, eh?
Now that's handy! Now if they only had a calculator for going the other way...
Cheers, James Arthur
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