Electronics Forum | Mon Mar 26 07:38:26 EDT 2007 | davef
The temperature that will melt solder holding top side SMT components during wave soldering depends on the alloy of that solder. So, for example, you'd expect: * Near eutectic SnPb solder to melt around 215*C. * LF to melt around 240*C. It's common
Electronics Forum | Thu Mar 29 14:46:16 EDT 2007 | jmelson
Oh, I should have been more specific on microscopes. I have a Bausch & Lomb StereoZoom 5 and an old Olympus. They both work pretty well. I think the Olympus has a little better depth of field, but the B&L has better contrast. (Maybe the Olympus j
Electronics Forum | Tue May 29 15:10:30 EDT 2007 | realchunks
Hi Jerry, Sounds like the white stuff is flux. I doubt if 4 pcb mfgers could be undercuring all at once. Good point though. Since you changed washers and now have the problem - it's your new washer. Can you bring back the old one to make sure?
Electronics Forum | Wed Jun 13 12:19:25 EDT 2007 | allwave
Brian, We had similar problem in our inline wash machine time ago. We checked everythin on equipment (filters, DI water purity, sprayers angle, etc). To make the long story short, we found out that the problem was caused by a new solder paste. This s
Electronics Forum | Wed Jul 25 10:57:08 EDT 2007 | cecil
Our board layout folks are currently designing a PWB using a 132 QFN. The component is .5mm pitch with .35mm square pads. The component manufacturer recommends the following footprint: .4mm square land .3mm square solder resist 1.why do they spec
Electronics Forum | Tue Aug 21 12:57:49 EDT 2007 | ev
Looking for pointers. We have a semi-automatic SMT Techniques stencil printer. We have had some problems with a recent job. Problems were in the areas of finer pitch ics (paste voids as well as paste shorts and some smearing) in certain locations on
Electronics Forum | Thu Sep 27 17:25:33 EDT 2007 | chef
The short answer is immediately after reflow the problem occurs. To be more exact, what you are describing is not "rust". Rust occurs in iron. The oxidation that occurs in Tin-Lead has been sometimes called "white rust". Either way, oxidation occur
Electronics Forum | Wed Oct 24 07:55:06 EDT 2007 | rgduval
Daniel, We'd recommend MyData's as good low foot print, short quantity machines. They have a good level of flexibility for the price and operation. Considering what you've described, an older used TP9 would suit you. I'll caution you, though, tha
Electronics Forum | Wed Oct 31 09:09:35 EDT 2007 | russ
Small waves are fine, biggest problem is the little to no preheat length. This is reason that complex boards cannot be soldered without defects. They also do not handle thick PCBas very well either because of same issue. Most of these "benchtops"
Electronics Forum | Thu Nov 08 08:44:22 EST 2007 | aj
Hi, I have just taken a look at the Connector Images. Is there a difference in pitch between both connectors ? From the photo it looks like the Annular Rings are oversized on Image #1 especially around the centre area ( this might be the image ).
