Electronics Forum | Fri Nov 23 11:58:18 EST 2001 | Warren Pumyea AMT, Inc.
Hello, I have a copy of the toolbox. Have not used it for a while so I'm not sure about the optimizer. please respond and let me know what e-mail address to send it too. Regards, Warren Pumyea AMT, Inc. Contract Manufacturer 978-840-3070
Electronics Forum | Fri Nov 23 11:58:20 EST 2001 | Warren Pumyea AMT, Inc.
Hello, I have a copy of the toolbox. Have not used it for a while so I'm not sure about the optimizer. please respond and let me know what e-mail address to send it too. Regards, Warren Pumyea AMT, Inc. Contract Manufacturer 978-840-3070
Electronics Forum | Wed Nov 21 10:41:03 EST 2001 | arzu
Hello, Sometimes you have no choice other than putting uvias in ubga's-pads. I know examples of high-end mass production of products with ubgas having voids. (no problems, but always voids visable in x-ray) I also performed a DOE a while ago to avoid
Electronics Forum | Wed Nov 21 21:50:50 EST 2001 | Glenn Robertson
Tony, What you are seeing can occasionally be caused by gaps in the plating of the blind vias. If they are not "airtight" you can get moisture coming from the laminate that shows up as voids in the solder balls. You might check on the board sup
Electronics Forum | Tue Jan 21 16:28:02 EST 2003 | tony_sauve
Sorry I didn't close this one off last year... We had some failure analysis done on these PCB's ( 3D x-ray,microsectioning,SEM) and the results definitively proved that there was some contamination @ the base of the uvia's that had the voiding. It ap
Electronics Forum | Fri Nov 23 00:44:48 EST 2001 | William
Hi expert, I'm doing a research on the SMT market and are in desperate need of some information on the history of SMT. How did everything start? Was there life before SMT? What was the first stage? All information on board handling and SMT is mor
Electronics Forum | Mon Nov 26 20:30:03 EST 2001 | davef
Dirt => Beer => Girls FACT: * Hybrid circuits in the 1960s that were used to conquer space where the genesis of today's SMT. * Japanese commecialized it to build better transitor radios * UIC & Dynapert fought it tooth and nail. UIC finally got t
Electronics Forum | Wed Dec 12 20:06:05 EST 2001 | zerbrenny
OK, here is the deal. I won't write a book but I have to correct the putz that said the birth of SMT was an accident. Actually the SMT machine replaced the poor bastards who had to place components by hand. Manufacturers were looking for a better way
Electronics Forum | Tue Nov 27 01:43:29 EST 2001 | Anders
The reason why we are using soldered PCB jumpers is that it is cheaper than dip-switches, 0 ohms resistors, etc. Field updating is also easier. We are producing different variants of some of our products. It would nice if we could presolder the PCB
Electronics Forum | Tue Nov 27 15:57:58 EST 2001 | mparker
rather than applying jumpers, try thinking it another way. Have all possible jumper connections pre-made by the fab design. Use an exacto or dremel to "open" the undesired paths by removing a bit of copper trace. total flexibility, only one fab make
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