Conductive inks?
I remember using them to make ceramic monolithic capacitors.. The required
baking to cure them and they contained exotic metals like palladium etc...
Never would have thought of that... I wonder it they would stand up in an
application like that?
Interesting thought, thanks...
The eyelet is probably the most obvious idea, however we are mounting a
tuned filter over the hole and it might cause a mechanical interference
between the coil form and the eyelet flange.
Another thought was copper tape or strips... but they seem very labor
intensive.
Selective electroless plating would be the ideal option but I don't think
anyone has invented it yet... or sputtering but I think the masking job
would be intense... Maybe a milled out plug that just fit inside the hole
and then solder it in? Probably impractical.
Thanks for the ideas... It looks like we may not have to do it after all so
the pressure is off, but it is potentially an activity someone might need to
do someday...
Best regards,
Bill Brooks - KG6VVP
PCB Design Engineer , C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
e-mail:[log in to unmask]
http://www.dtwc.com
http://pcbwizards.com
-----Original Message-----
From: Lee Parker [mailto:[log in to unmask]]
Sent: Wednesday, December 01, 2004 9:13 AM
To: [log in to unmask]
Subject: Re: [TN] Plating through a 2 layer board hole after assembly?
Bill
You might want to look into conductive inks. It would probably require
some process development. Some curing would also be involved. Several
suppliers have these products on the market.
Best regards
Lee
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brooks,Bill
Sent: Tuesday, November 30, 2004 7:08 PM
To: [log in to unmask]
Subject: [TN] Plating through a 2 layer board hole after assembly?
Don't laugh... I have been asked to find out if we can plate thru a 2
layer
board hole top to bottom after the board has been assembled... Is this
possible? If so how? And who would do it?
Other alternatives to get connectivity from the top to the bottom side
of an
already assembled board?
Z-wires? Eyelets? Any other ideas?
The non-plated hole is .156 diameter and the thickness of the board is
063
FR4 glass/epoxy material 2oz copper both sides.
Thanks in advance..
Bill Brooks - KG6VVP
PCB Design Engineer , C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
e-mail:[log in to unmask]
http://www.dtwc.com
http://pcbwizards.com
-----Original Message-----
From: R Sedlak [mailto:[log in to unmask]]
Sent: Tuesday, November 30, 2004 3:31 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion White Tin Plating Specification
Before we go off writing specifcations that make the fabrications people
spit and swear, I want to remind all that all immersion plating is
self-limiting, and when all the substrate is covered, you stop plating,
no
matter what temperature, or how long you leave it in the plating bath...
Most fabricators have trouble getting 50 microinches of Tin, and 40 is
pretty much the standard...
30 is pretty considered pretty thin..
And, no flat finishes are going to perform as well as HASL, if only
because
of thickness, nevermind superiority of alloy...
Rudy Sedlak
RD Chemical Company
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