Electronics Forum | Thu May 07 19:29:40 EDT 2009 | kareal
Hi Davef, Do you means it is natural for tin diffusion to copper trace during SMT process? but I could not detect tin in UHAST T=0 unit, and the tin diffusion was found only in copper trace of C4 cage. Two question: 1) Could you tell me which pr
Electronics Forum | Tue Jul 08 12:11:17 EDT 2008 | gabriella
Hello, you will probably need more temperature. Notebook - probably the board is designed to transfer more heat(insude layers all copper). Tell us more about the problem you have and something about the board. what exactly is your problem? You can't
Electronics Forum | Thu Jul 14 19:12:40 EDT 2005 | sync40
Hi. In the past years I had made dozens of PCBs but now I am trying to get a professional finishing on them. The main problem is oxidation of the copper traces. Basically I use the silkscreen method to make the pattern in both layers and then etch. L
Electronics Forum | Thu Jul 31 15:41:23 EDT 2003 | davef
Q: Could any of you guys tell me what exactly is this greenish thing ? A: No, but is not copper oxide. Copper oxide is brown, the color of a penny [here in the US] or an untreated copper laminated trace on a board. Many copper salts are greenish in
Electronics Forum | Fri Aug 21 12:54:21 EDT 1998 | Tryin' and Learnin'
HASL: (hot air solder leveling) is a process used to cover the Cu. Either Sn/Pb is used or Ni/Au or some other combo. In one case you create a land pad and in the other (with resin)you cover the Cu so that you only have a "trace." Is that correct so
Electronics Forum | Thu Apr 08 08:34:34 EDT 2004 | Evtimov
The camera is in the head. Sorry forgot to tell you.Stefan now I do the calibration with inprint in a putty. Ken I am looking for accuracy when I calibrate the camera. Tell me more about that slug. What is it like? Where to place it? How to use it?
Electronics Forum | Sat Jul 02 10:27:19 EDT 2022 | madisreivik
Hello ! I got exp only with leadfree HASL, but maybe the same problems apply. Also, the leaded HASL has probably lower process temperature. This could be copper, which has settled to the tank bottom. With leadfree, the copper is removed from molten
Electronics Forum | Sat Nov 17 18:29:02 EST 2007 | bbarton
Let's face it guys...in most cases (stress the MOST!) a typical FR4 board will do the job. Few layers, low copper, not too densly populated etc...no worries. Use a reflow profile which avoids the 245-250C range, use a shorter TAL, Viola you have a go
Electronics Forum | Fri Mar 07 10:51:58 EST 2003 | MA/NY DDave
Hi O'Conner, I hope you also tell us what Universal-GeorgeW discusses with you. It is a little strange seeing his name on this list and his phone number. Gee I can give you his email address but won't.. Again distance engineering is tough. I woul
Electronics Forum | Thu Aug 13 12:55:46 EDT 1998 | Dave F
| Hi, can you please tell me how to make green coating and through-hole plating of PCB? Thanks! | Xingsheng Xingsheng: Welcome. Bible on PCB fabrication: Printed Circuits Handbook, Clyde Coombs, McGraw-Hill Web resources: http://www.pwbrc.org/ a
