Electronics Forum | Fri Oct 10 19:24:53 EDT 2003 | MA/NY DDave
Hi SMTAnet, SMTnet, You already got good answers for how to go forward. I believe that this 50mils is a remnant of the days when we started at 125 mil grids and started the process of going down to 100mil grids, SMT. My gosh who would ever want a 1
Electronics Forum | Mon Oct 06 10:04:29 EDT 2003 | davef
Excess low residue flux is very dangerous to leave on your finished assembly, because it can: * Be corrosive to your solder connections * Promote dendrite growth. To prevent this, follow your supplier's recommendations on: * Applying the proper amou
Electronics Forum | Tue Oct 07 01:02:25 EDT 2003 | Hoss
Adam, I can't disagree with Pete that an Ionic contamination test may ID the affected boards. However, if you have a large number of boards to test, this may not be the answer. Omegameter testing takes 10-15 minutes per unit if memory serves. On
Electronics Forum | Wed Oct 08 23:49:29 EDT 2003 | cngodles
I need to wire some LED's. I have a pair installed in my headlights that use some sort of small thing at the end of the wire. They run off of the 12 volt car battery. They can stay on for over a month without starting the car and still not drain the
Electronics Forum | Mon Oct 27 09:56:09 EST 2003 | sp1
A light emitting diode or "LED" doesn't care about voltage, it will light with approx. 10 to 20 milliamps of current. In a 12V system (such as an auto), a resistor of 1K ohms is ideal. At 12V, this allows about 12 mA of current, at 13.8V (approxima
Electronics Forum | Fri Oct 10 19:14:27 EDT 2003 | MA/NY DDave
Hi SMTAnet, SMTnet, I am pretty sure recently I heard and read a report with them simply reflowed with an improvement in strengths from a slowly degrading strength. I can't find it quick and don't remember all the caveats like maybe an underfill phe
Electronics Forum | Mon Oct 13 08:35:38 EDT 2003 | markhoch
I've found a number of PCB's that have already been manufactured that were run using the wrong reflow profile. I verified that the PCB's did not see adequate peak temp, (as per the paste manufacturers recommendation)**. Is it possible to run the PCB'
Electronics Forum | Mon Oct 13 10:47:35 EDT 2003 | russ
i think Dave night have meant what do the solder joints look like? (maybe not) Anyway, I personally wouldn't reflow these boards unless you have solder joint failures We (I) used to hardly ever exceed 210 Deg. during profiling until the leadfree stuf
Electronics Forum | Tue Oct 14 23:40:36 EDT 2003 | Dean
Here is a tip. Do an evaluation on materials. DO not trust what anyone says about solder paste. There are just too may "experts" out there peddling the brand of the week. You can begin with the brands listed, but do your homework. You know your
Electronics Forum | Tue Oct 14 23:59:49 EDT 2003 | MA/NY DDave
Hi I am going to take another direction. Go to some classes, and buy some of the books, or hire a consultant to get you up fast. A consultant would be my first choice for speed and accuracy. National Training Center for Microelectronics in Bethleh
