Electronics Forum | Tue Apr 09 05:36:27 EDT 2002 | lhudson1
Silver in the paste is present to minimise any negative effects of silver in the pcb finish or component terminations. 2% Ag prevent silver leaching thus giving a more reliable joint.
Electronics Forum | Wed Apr 17 22:43:54 EDT 2002 | ianchan
what process is that? can kindly describe? is it that technology where bricks of solder are "ready made" deposit onto PCB pads thus eliminating the need to solder paste print/dispense by machine?
Electronics Forum | Tue Apr 30 07:49:38 EDT 2002 | johnw
shawn, define what you mean by solder ball's scattered across the board? I'd tend to agree with the thoughts of too much paste on chip's but normally your ball's would be mainly around these devices although som can move around depending on the surf
Electronics Forum | Mon May 20 16:56:24 EDT 2002 | Gary
Excess slump of paste and mis-registration can cause solder balls along with moisture. Use same date code of pcb and run with no components, paste only. Also pre-bake boards with humidity sensor in oven. If high humidity, moisture and solvent residue
Electronics Forum | Tue Apr 16 09:38:43 EDT 2002 | Karen
I was wondering if anyone knows the HP on the integral 1,500 cfm blower on the SMT-800 PCB Cleaner. thanks.
Electronics Forum | Thu Apr 18 16:55:39 EDT 2002 | davef
Yes. Ceramic is much better. We use FR4 in fairly high voltage circuits. What are the particulars? * Where are you arcing * How many layers, prepreg, etc
Electronics Forum | Fri Apr 19 15:52:31 EDT 2002 | davef
So, what is 'high voltage'? anywho? * We sort of use 10 kV as the starting point for 'high voltage'. * National Electrical Code defines a much lower starting point (300 or 600 V?),
Electronics Forum | Mon Apr 29 05:28:55 EDT 2002 | ianchan
Hi, does that rosy cheeked sales vendor of yours, have a website I can review? do they have online info of that IMPCB? if not, any email contact I can inquiry with? just curious on that IMPCB... Thanks.
Electronics Forum | Mon Apr 29 16:56:13 EDT 2002 | gsmguru
Look at: http://www.bergquistcompany.com/therm.htm The material is made by Bergquist Inc. All sorts of good stuff on their website. Look under Thermal Clad. Dave G
Electronics Forum | Thu May 09 17:19:28 EDT 2002 | davef
Can�t help you with the article that you read. Other places to start are: * 2221, 7.2 Heat Dissipation Considerations, 7.3 Heat Transfer Techniques, and 8.1.10 Heat Dissipation * 2222, 9.1.2 Thermal Relief In Conductor Planes
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