I finally got a PCB house to gold plate some copperclad FR4 for me, so my breadboards won't get all tarnished and grungy in a couple of weeks.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Immersion Gold, how much? thickness? Price?
0.062, 1 square foot each, gold both sides, $100 each. I didn't specify the gold thickness.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Den fredag den 28. februar 2014 23.19.44 UTC+1 skrev John Larkin:
I believe normal gold is about 4 micro inch thick so if my math is right about $7.5 worth of gold per side
-Lasse
Ever tried storing them with 'shrink wrap' ?
Did you have them put Nickel under the gold? If not, they won't keep very well. The gold will alloy with the copper over time, and the trapped hydrogen (or maybe trapped acid or something) will turn the copper into a horrible black mess, which will eventually eat through the gold.
In the early lead-free days, I had a board house talk me into gold flash (I guess this is electroless gold directly over Cu). Sure looked good at first, but it didn't solder reliably, and every pad that didn't solder became a HUGE nightmare to get a proper joint. The technique was to lever up the lead with an Xacto knife, scrape the pad until shiny Cu was visible, tin and then resolder the lead. WHAT a headache! The longer the boards sat or were in use at a customer's site before rework, the harder it became.
Jon
This is the current standard, "immersion gold over nickel", which is a few microinches of gold over a nickel barrier layer. You'd need a lot of pure gold, hundreds of uin maybe, to keep the copper from diffusing through.
Nickel isn't solderable, but the immersion gold over nickel solders beautifully somehow.
I just got a call from a guy who needs a goofy analog gate circuit, for a laser thing, and I'll build it for him this weekend. He'll be impressed with a gold breadboard.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Nice. I wonder what would happen if one would cut this up into tiny snippets and sprinkle them into the water near West River Street in Truckee. That might make the evening news.
A real bling-board makes things look like a million Dollars.
-- Regards, Joerg http://www.analogconsultants.com/
That's just evil!
Hah! I heard on the evening tube-news the other day that people are finding gold in parts of Ca. that have dried p in the current drought...where the heck did I put that shovel...
I think that was Joerg's point. ;-)
We just came back via a road next to the Cosumnes River. Despite driving rain there were a few gold panners out there. They looked worse than almost any homeless people I ever saw.
-- Regards, Joerg http://www.analogconsultants.com/
New gold rush!
The low water levels are actually encouraging a mini-gold-rush. You can make something like $100 a day if you know where to pan.
To bad this one is a freebie.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
Very nice. Now your customers know what they're paying for. ;)
Cheers
Phil Hobbs
(who just emerged from Server Purgatory, due to the failure of a Chinese PSU)
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
My first goldie breadboard will be for Daniel R. I remember the day that you and he went wild computing the vibrational modes of a liquid droplet. I was impressed, especially that anyone would be willing to think that hard.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
Well, at USD 7.5 a piece, one could easily obtain a 4 - 6 layer PCB, silk-screened and solder guarded. The clients for the PCBs under discussion must have deep pockets to pay USD 7.5 just for a gold plating on contacts.
On a sunny day (Fri, 28 Feb 2014 14:30:42 -0800 (PST)) it happened Lasse Langwadt Christensen wrote in :
:-)
-- Nickel is solderable if it isn't allowed to passivate, which is what the gold film keeps it from doing.
Or solder, which I believe is the case with most MLCCs -- tin plated nickel endcaps, so they're still easy to solder. At least that's what I've read, as they're trying to get away from using pricey palladium there.
I have some mil spec cable, "mineral loaded teflon" jacket, beautiful wound stranded construction. Nickel plated copper strands (not silver plated!). It's not *un*solderable... but it sure takes a long time and a lot of heat for regular rosin paste to get the job done.
Tim
-- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com
so
tit's $7.5 per side and it's for a manhattan style prototype, the gold is just for looks
and a single protype 4 layer will PCB will cost alot more than $7.5
-Lasse
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