Electronics Forum | Fri Aug 13 04:12:41 EDT 1999 | ray hare
| | I am currently involved with designing a pcb which will use 225 pin bga,s | | The problem with this design is that the components will dissipate a lot of heat and the design we have come up with is | | use the middle 6 or 7 rows of balls as the
Electronics Forum | Tue Aug 10 15:56:30 EDT 1999 | Jason Gregory
Has anyone ever heard of this? I have a Camalot System 5000 and we were in a pinch to produce some prototype boards. We needed Sn62Pb36Ag2-no clean in a dispensing mesh. All I could get my hands on was some Interflux paste in a jar. The formulation i
Electronics Forum | Wed Aug 04 21:52:54 EDT 1999 | Dave F
| We're getting field failures in a high impedance portion of the circuit. Think the unpopulated pc card has contaminates because we were able to grow dendrites by applying a 9 volt battery across the suspected pad, placed a drop of de-ionized water
Electronics Forum | Fri Jul 30 17:26:02 EDT 1999 | John Thorup
| | Surface Mount Components like QFP's in Tray usually comes sealed in an anti-static plastic pack. In case the QFP's were removed from the said anti-static bag for more than 2 weeks, do these components needed to be baked for they might produce so
Electronics Forum | Fri Jul 30 19:58:28 EDT 1999 | ScottM
| | | Hello Netters, | | | | | | I have a customer who wants us to aquaeos wash a PCB after all operations have been performed. The PWB is two layer FR4 with a Transformer, a Multichip Module with Conformal Coating, (6) 11" insulated wires that are
Electronics Forum | Wed Jul 28 20:56:58 EDT 1999 | Dave F
| Currently, we are baking any PCB before process on SMT, the 'reason' is to dry any possible humidity that could be inner the PCB, it does not matter if the PCB is multilayer or not. We bake PCB's at 107C for 4 hrs and the board must be process into
Electronics Forum | Thu Jul 29 21:00:27 EDT 1999 | Dave F
| Thanks Earl for your insight! I sometimes feel conspicuous as one of the few women I've seen frequenting this board, but everyone's been helpful and has resisted the overwhelming temptation to pat me on the head. | | From what you and some of the
Electronics Forum | Fri Jul 23 14:07:52 EDT 1999 | Carl J. Odle
We are having a process related problem with pullup resistors on a controller card which has a I960 micro-processor. The controller monitors signal inputs and it's own resources then blinks a LED to indicate its working. The problem is that after a p
Electronics Forum | Wed Jul 28 16:05:12 EDT 1999 | Rob Fischer
| | | Just go look at the thread on stencil cleaners started by Scott Davies in the March 1-15, 1999 achives if you want to see some juicy stuff...then make your mind up about vendor inputs. Pretty obvious if you ask me... | | | | | | -Steve Gregory
Electronics Forum | Wed Jul 21 20:52:52 EDT 1999 | Scott
| | I have pcb's in which i am experiencing warping. | | the boards are 12.8125" on a diagonal measurement. | | they are out approximatley .010". | | the boards are combination thru-hole,smt, they also have 3ounce copper.what is acceptable,and what i
