Electronics Forum: copper circuits (Page 1 of 18)

Assemby of flexible printed circuits

Electronics Forum | Wed May 16 15:40:56 EDT 2012 | davef

Here's some notes from a Bob Willis presentation Assembly of Flexible Circuits with Lead-Free Solder Alloy [Bob Willis leadfreesoldering.com] * Flexible Circuit Construction ** Base Material - 0.05mm Copper 18/18 um ESPANEX from Holders Technologies

Verifying requested copper weight

Electronics Forum | Sun Sep 09 21:59:36 EDT 2018 | sanneyyu

we are a PCB house, you can add some patterns at breaktabs or board edge, this can help you easily verify copper weight for every circuit layer.

Verifying requested copper weight

Electronics Forum | Tue Apr 24 09:19:51 EDT 2018 | vetteboy86

Is there a preferred method among printed circuit board assembly for accurately and quickly verifying the copper weight of a printed circuit board? I would like a tool and process that our quality inspector could quickly use to verify upon receipt of

Re: copper land delamination

Electronics Forum | Thu Nov 25 20:28:43 EST 1999 | cklau

hello, One way to prevent copper land delamination is to applied Anchoring spurs also referred to as "tie-down tabs" or "rabbit ears".These are a metal projection around a land.This features is fully captured by the cover lay (cover coat) that is n

Fine pitch and thick copper

Electronics Forum | Wed Dec 08 04:19:16 EST 1999 | pascal MATHIEU

I am working in electronic automotive industry and today we are facing to a very serious problem : if we want to use a PCBoard with a copper thickness of 90�m + fine pitch circuit (0.65mm, 0.5mm) the supplier(several) of the PCB has some trouble t

Lead free tin copper only

Electronics Forum | Tue Feb 07 13:39:42 EST 2006 | gregoryyork

You can use straight forward Tin/Copper but it flows very poorly so solderability is an issue. Dosing with Phos improves this but need to stay on top of it. We have supplied some 3.8%Ag alloys for flow they work well but you get a small 'chill point'

Etch strain gauge in copper layer to measure deformations during press process [How to?]

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

Etch strain gauge in copper layer to measure deformations during press process [How to?]

Electronics Forum | Wed May 14 13:31:22 EDT 2014 | taiji

You should look in to this document: IPC/JEDEC-9704A Printed Circuit Assembly Strain Gage Test Guideline Regards

Etch strain gauge in copper layer to measure deformations during press process [How to?]

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

Bare Copper Circuit Boards

Electronics Forum | Fri Jun 18 15:56:33 EDT 1999 | C.K.

Has there anyone bold enough to try this in their shops? My cubemate just got through telling me that at his last shop, they had bare copper boards (no HASL, no OSP, no nothing), with minimal solderability problems.

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