Electronics Forum | Mon Mar 29 11:49:44 EST 2004 | gregoryyork
White residue, probably nothing to do with the flux but was more than likely mineral salts from resist cure problem that are only soluble in Mineral Acids. No residue is the best IF resist is good, if resist issue's use low solids Rosin No Clean and
Electronics Forum | Mon May 26 08:02:11 EDT 2003 | davef
Resistance: Tables of wire gauge often provide a resistance measure of some kind for each gauge. That way we can estimate the resistance of any length of wire we might be interested in. Calculating trace resistance is only slightly more complicated.
Electronics Forum | Tue Sep 14 13:36:11 EDT 1999 | Jeff Armato
I am looking to find a formula to calculate the resistance of circuit traces based on width
Electronics Forum | Tue Aug 18 18:55:04 EDT 1998 | Sam Guilaume
Does anyone know the actual junction-to-case thermal resistance for TSOPII packages.
Electronics Forum | Fri Jun 18 08:19:12 EDT 1999 | Sergio Luiz Vito
There is a PCB with SMD components glued on bottomside. When I make tests for checking the resistance of glue the result is a break in the surface of PCB. How can I measure the surface resistance of PCB surface? How can I increase this resistance?
Electronics Forum | Thu Jan 19 16:25:03 EST 2006 | solderiron
Any metalurgists out there? I take the resistance value of a metal oxide substrate made of silver or gold or manganese. I then solder with 63/37 and the resistance changes but not dramatically. I then solder with Lead free SAC305 and the resistance c
Electronics Forum | Fri Jan 20 08:55:31 EST 2006 | patrickbruneel
Steve, How do you measure the resistance is it by probing the surface? Concerning the alloy there is a straightforward linear correlation between the tin content and the electrical conductivity of the alloy. The higher the tin content in the alloy,
Electronics Forum | Tue Aug 27 01:19:38 EDT 2002 | zolasteven
Hi, I have a few questions regarding printed circuit board. What is the difference between the solder pads and the solder resist or mask? What is the purpose for the solder resist? What color is it? When printing solder paste should the paste be
Electronics Forum | Sat Jun 19 08:37:25 EDT 1999 | Dave F
| There is a PCB with SMD components glued on bottomside. When I make tests for checking the resistance of glue the result is a break in the surface of PCB. | | How can I measure the surface resistance of PCB surface? | How can I increase this resis
Electronics Forum | Thu Dec 13 20:54:23 EST 2001 | davef
There is neither �nominal thickness� nor �is there a set maximum� for via masking. We use some of our vias as test pads. So, as you�d expect, we get rabid when we get mask bleed onto these pads. IPC-6012 - Qualification & Performance For Rigid Pri
