Out-of-tolerance zero ohm resistors

Well, a BGA ball doesn't sit very stably on a solder-coated convex-bump pad. Try stacking two basketballs; the upper one tends to slide off.

That's true for thick gold. A few microinches of gold will immediately dissolve into the solder and become only a trace component.

Oops, sorry, I meant smho, the plural of mho.

This is pretty good,

but I wish it had higher resolution.

lol

Are we heading back to the schmoo thing again?

Well, we've got enough schmos around here as it is. ;)

Cheers

Phil Hobbs

On Mon, 01 Jun 2015 16:28:01 -0400, rickman Gave us:

You lack co-planarity.

On Mon, 1 Jun 2015 14:28:53 -0700 (PDT), snipped-for-privacy@gmail.com Gave us:

Maybe that is why "too much" is never used on PCB pads.

One has to 'wet', then release or wick, then re-wet", then repeat with gold cup mil std solder pins... NOT circuit pads. Not much else at all, in fact.

There is no embrittlement on PCB assemblies. Doh! Edge connected or through-hole SMA connectors or other gold plated "connectors" and test pins MAYBE, but not likely. Mil std connector pins using solder cups not crimps.... definitely, abated by using the above described procedure. PCB pads... NOT!

You read a lot, but understand little, much less KNOW. Or you would know the difference between one micron and several. And your little dogs too.

On Mon, 01 Jun 2015 17:05:17 -0700, John Larkin Gave us:

No... that was Zeus.

On Mon, 01 Jun 2015 17:08:20 -0700, John Larkin Gave us:

Not if you put these on 'em...

On Mon, 1 Jun 2015 19:01:39 -0700 (PDT), Phil Hobbs Gave us:

I like Scmoo Gold. Made by Belgian monks...

Those Belgian monks don't seem to have time for praying. All they do is make beer.

On Mon, 01 Jun 2015 19:41:03 -0700, John Larkin Gave us:

Ale. I'm an Ale-ion.

It was supposed to read schmoo.. A play on Chimay.

I know I posted this before but...

If you mean to say that its noise level would be 4kT|R|, then, no. Of course, it does add noise, but it may be more or less, depending.

Jeroen Belleman

Oh dear.

What?

half a mile high then, at most two of the layers will be plated,

On Tue, 02 Jun 2015 08:06:33 +0100, John Devereux Gave us:

Piss poor stencil thickness leading to piss poor job.. Piss poor paste efficacy. Likely left out too long before reflow as well.

It had/has not a goddamned thing to do with the gold PCB pads.