Electronics Forum: hours of operation (Page 3 of 55)

Measuring Voltage of LED

Electronics Forum | Sun May 30 22:59:29 EDT 2004 | snmsmt

I assume your talking about the forward voltage (Vf) of the LED during operation? (Probably not the correct forum for this question but anyway...) My understanding is that 'Vf' is measured during the LED's operation at a forward current ('If') of 20

Cleaning of 'No-Clean' paste

Electronics Forum | Tue Sep 07 06:24:07 EDT 1999 | Steve Cheung

We are changing over to a No-Clean paste soon and l was wondering how other people tackle the issue of stencil and PCB cleaning in high-volume production. The paste we are using is Cobar 325RX and its pretty sticky stuff let me tell you! Our proble

Solderability of a metal

Electronics Forum | Tue Mar 04 09:12:35 EST 2008 | davef

Q1. What would you recommend for the best practice or comparison? A1. We'd go with dip & look. It's easy and cheap, requires no advanced degrees in measurology. Have you reviewed "J-STD-002B - Solderability Tests for Component Leads, Terminations, Lu

Re: Baking of PCB's/Flexes

Electronics Forum | Thu Oct 26 13:56:08 EDT 2000 | ptvianc

Hello: Pre-baking laminates should only be performed:(1) to meet contractual agreements or (2) in response to an actual defect that can be traced to PWB water absortion. Besides the fact that a pre-bake is an enormous process "bottleneck," it also

Cost of labeling PCB's

Electronics Forum | Wed May 17 16:02:53 EDT 2000 | Mark J. Braska

Is there any data on the total cost of labeling PC boards. Included in this cost would be the labels, ribbons,printers & maintenance,software, and engineering & operator expenses(fully burdened). I am searching for an independant analysis of the co

CP4 of death

Electronics Forum | Fri Apr 14 10:07:18 EDT 2006 | vikkaraja

Have you checked the table itself. It seen it where either a PCB lifter or adjustble rail brake is operating properly.

Visual Inspection of PCBA

Electronics Forum | Wed Oct 23 21:45:17 EDT 2019 | ixqprint

100% appearance does not mean that programming is correct, can only say that the general direction is correct, the specific small details should be improved during the operation.

Performance estimation of SMT-assembly-Systems

Electronics Forum | Tue Aug 31 10:52:19 EDT 1999 | Andreas Foehrenbach

I'm in univerity research on SMT assembly systems. Especialy Simulation and Optimisation using OR-Methods. We developed flexible simulation models of various assembly-machines and use them for performance estimation (Components per hour) under differ

Cleaning of Entek Boards

Electronics Forum | Thu Jul 18 21:04:06 EDT 2002 | davef

So, why can't you clean misprints on Entek boards? Entek: Cheap, flat, OK shelf life, not without process and fabrication issues. Your Entek organic solderability protection is probably Entek Plus [CU106A] made by Ethone OMI. Consider getting a co

Germanium doping of SN100

Electronics Forum | Mon Dec 17 19:18:53 EST 2007 | bbarton

OH MY GOD!! Finally it's becoming public knowledge here on the streets. YES germanium is in this material. As much as these guys and ALPHA METALS wanted to keep these things secret, anyone with a halfway competent lab would quicky find out why all of


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