Electronics Forum | Fri Aug 17 01:40:55 EDT 2001 | V.RAMANAND KINI
We are in the watch & clock Business. We have a Watch IC chip that has to be wirebonded using Ultrasonic aluminium wedge bonder. The wire dia is 1.25mil. The PCB is made of G10 Glass epoxy copper clad laminate. The copper thickness is 18 microns. The
Electronics Forum | Tue Feb 28 10:18:35 EST 2006 | Steve Gregory
I just went through the same problem. We have an inductor that is made with a bundle of 30-strands of Litz wire that is vaccuum coated with varnish, and have the ends of the wire bundles tinned that we have to solder to SMT pads on the board. The ind
Electronics Forum | Mon Aug 27 15:06:29 EDT 2001 | davef
This otta push Wolfgang over the top ... Recommended reading G.G. Harman, Wire Bonding in Microelectronics : Materials, Processes, Reliability, and Yield, 2nd edition, McGraw-Hill Electronic Packaging and Interconnection Series, 1997. G.G. Harman, R
Electronics Forum | Fri May 16 05:17:13 EDT 2014 | julianf
Interesting. How did you connect the gauges in the press? Our press only has connections for thermocouples. But in essence, it's only a wire and an electical output. If you placed these prefabricated gauges on top and on the bottom surface, weren't
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 Nov 14 17:09:07 EST 2005 | davef
From Alpha Metals: "The test for copper dissolution was conducted by dipping a pre-fluxed copper wire specimen into the test alloys for a specified time period. The change in diameter of the copper wire is measured and a rate of erosion is determined
Electronics Forum | Tue Oct 04 20:31:16 EDT 2016 | davef
IPC-7721, Section 6.1, Jumper Wires, Jumper Wire Selection #5 states: "Recommended wire is solid, insulated, plated copper wire, 22 to 32 AWG with a heat resistant insulation. Wire with tin-lead plating may be restricted due to environmental laws."
Electronics Forum | Fri Oct 16 14:36:11 EDT 1998 | Jeff Sanchez
| With current soldering of stranded wires to pcb assy's the wire tends to be very brittle and can break with very little movement of the wire. We use a low residue cored wire. Anybody with advice or who has seen a similar problem/knows how to overco
Electronics Forum | Thu Mar 04 18:39:54 EST 2021 | SMTA-64387124
I have successfully used laser marked bar codes on PCBs. Use an area without any copper so that you are marking on the FR4 only
Electronics Forum | Thu Jun 12 03:37:05 EDT 2008 | benefon
It is also possible to etch the barcodes directly on the PCB by using a laser. The solder resist mask is easily burned by laser and if there is copper underneath the contrast is quite good. The contrast is satisfactory even if there is no metal under
