[sdiy] No marking on resistors

[Roman]

There's usually very few cap values on a board, and quite a lot resistor values. So most of the time it's easy to distinguish caps according to their size, thickness and color. I mean when you know what should be there and looks different. For me resistor marking has helped a lot of times during service and assembly check.   So if marking SMD is useless, then why bother marking THT resistors. The same handling rules can be applied. It can be $0.00002 cheaper to make then, like SMD one.   Roman   Dnia 3 kwietnia 2018 00:10 Tim Ressel <  timr at circuitabbey.com > napisał(a):  Considering that some SMT caps are not marked and many of the
      smaller SMT resistors aren't marked either .. is it really that
      much of a surprise? Because of the ceramic SMTs not being marked
      we all have to develop the discipline to keep track of the parts.
      You can't just drop a strip of caps on the bench; you have to put
      it back in the marked bag/box/whatever. Since we all can do that,
      we can certainly do that for resistors as well.  As for repairs, shucks, I dunno. Make it all open source?  Ask
      someone with  the same device to measure R38 because yours is
      burned up?  Come to think of it, if a PTH resistors burns hard
      enough you may not be able to read the codes anyway.  I used to eschew 0603s because they were not marked. Maybe I was
      being silly...  --TimR   On 4/2/2018 11:39 AM, Roman wrote:  As someone have predicted it not so long ago on this list,
        it's already happening.  Vishay will not be putting any marking on their general
        purpose standard resistors, even the largest ones.   "The marking of Vishay’s standard R-chips in the 0603 to 2512
        case sizes — i.e. CRCW0603 – CRCW2512 with TCR of ± 200 ppm/K /
        5 %, TCR of ± 100 ppm/K / 1 %, and TCR of ± 200 ppm/K / 1 %, 0.0
        Ω — will be discontinued to improve the efficiency of the
        production process. Reel labels will enable product
        identification as before, and part numbers will not be changed.
        There will be no impact to the products’ performance or
        technical and environmental specifications (except the
        marking)."   Later they explain that various marking styles common today
        are only causing problems by fooling AOI and that no marking is
        actually better obviously.   So anything better than 1% and 100ppm will be still marked
        hopefully, at least for couple of years.  The other makers will follow soon I guess.  It would be good April Fools message if it was not a letter
        from March 28th.   Roman    ______________________________ mailing list
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--Tim Ressel
Circuit Abbey
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