Electronics Forum | Wed May 14 10:20:37 EDT 2014 | julianf
Hello all! For my mechanical engineering study I want to etch a strain gauge in the Wheatstone bridge configuration in a copper layer of an PCB. The goal is to measure the strain occurring in an PCB even during the press process! We can measure with
Electronics Forum | Sat May 17 10:38:49 EDT 2014 | sarason
I hate to say this but in all probability this wont work. I have built real strain gages and they depend on the change(Co-effiecent) of resistence with strain(or Stretch). since you are connecting you elements up with copper wire it will frm part of
Electronics Forum | Mon May 26 04:39:49 EDT 2014 | sarason
Damn near impossible. You need to see a real change in the difference between the 2 elements you are reading. So to give yourself any hope run 2 long traces one top one bottom up the length of the board. Then compare to 2 wriggly traces at one end (o
Electronics Forum | Mon May 26 03:27:00 EDT 2014 | julianf
Thanks for your reply Sarason. I'm aware now that my goals seem very ambitious and infeasible. Let me formulate my problem in an different way that might be more realistic. Is it possible to measure a DIFFERENCE in strain between top and middle la
Electronics Forum | Mon Aug 30 16:10:10 EDT 1999 | Dave F
| I have looked through the IPC web page and surfed to frustration. Can somebody give me a lead? | Brian: We don't use an etched board. We use a special stencil, described below and print on bare copper laminate. 3 Solder Wetting Test. Recogniz
Electronics Forum | Wed Mar 09 20:36:03 EST 2005 | amstech
We are looking for a PCB / copper etch services in India and interested parties may contact us at goburam@yahoo.com Regards.amstech
Electronics Forum | Tue Feb 20 15:23:28 EST 2018 | dleeper
Proper fiducials are going to be more accurate than drill holes. Since drilling is a separate step in the PCB fab process, the registration to the PCB isn't as accurate as the copper etching process which forms the fiducials. In a pinch, it can be u
Electronics Forum | Thu Feb 19 19:34:52 EST 2004 | Tom B.
Jim, There are 2 thoughts to this technology. SMDP (Soldermask Defined Pads) Can achieve more uniform opening of the land, yet as you know Regisration shift of mask can become a problem. Also there has been debate as to whther SMDP cause crack p
Electronics Forum | Fri Oct 07 09:18:39 EDT 2005 | russ
If you're using non-lead free parts then you don't have a pbfree assembly so why worry about marking it anyway? We apply this artwork after the assembly has been completely engineered for lead free. Artwork can be covered up with mask or whatever if
Electronics Forum | Mon Sep 24 22:56:52 EDT 2018 | sarason
IF you are wanting to do to this you are to late in the process. The gold is usually applied after the copper etching of the multilayer sandwich. The edge is extended beyong the board edge and the all pins are connected together with a bussbar. The b
