Reading labels on small ICs
in [Design]
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From: Joerg on 18 Dec 2009 19:39 Jim Thompson wrote: > On Fri, 18 Dec 2009 16:22:23 -0500, "Martin Riddle" > <martin_rid(a)verizon.net> wrote: > >> >> "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> >> wrote in message news:g1pni5lbobvam1mberhsjqq5cqmi5mrun9(a)4ax.com... >>> On Fri, 18 Dec 2009 15:15:52 -0500, "Martin Riddle" >>> <martin_rid(a)verizon.net> wrote: >>> >>>> >>>> "Harry D" <harryd(a)tdsystems.org> wrote in message >>>> news:42987c77-ce23-4e80-adb8-0641bda7bebd(a)y10g2000prg.googlegroups.com... >>>>> Gentlemen of this distingushed group, >>>>> How do you read labels on small ICs such as the ThinSOT or DFN packs >>>>> that are 2mm x 3mm? >>>>> Ok, I have old eyes, soldering these pups is do able but finding >>>>> pin#1 is impossible for me even using 7X eye loupe. I know JL will >>>>> say >>>>> it is no problem with his $3K Mantis and others are so rich that >>>>> they >>>>> hire a tech but I am not in that group. There's got to be an easier >>>>> way, say <$300. >>>>> Former member needs help; >>>>> Harry D. >>>> I use an Optivisor. >>>> <http://www.doneganoptical.com/optivisor.php> >>>> Get the hight power 2x or 3x lens. >>>> >>>> Cheers >>>> >>>> >>> That's what I have. Bought my pair around 1980. I sometimes use them >>> PLUS my reading glasses ;-) >>> >>> ...Jim Thompson >>> -- >> I'm surprised that Digikey and Mouser don�t carry these. I only see it >> listed in Mcmaster. >> <http://www.mcmaster.com/#headband-magnifiers/=4zmoob> >> >> Cheers >> >> > > Get the kids away from your monitor, then go to... > > http://www.analog-innovations.com/SED/OptiVisorMonster.jpg > What's in that binder titled "Perfect Time!" ? -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 18 Dec 2009 19:41 Chuck Olson wrote: > > "Harry D" <harryd(a)tdsystems.org> wrote in message > news:42987c77-ce23-4e80-adb8-0641bda7bebd(a)y10g2000prg.googlegroups.com... >> Gentlemen of this distingushed group, >> How do you read labels on small ICs such as the ThinSOT or DFN packs >> that are 2mm x 3mm? >> Ok, I have old eyes, soldering these pups is do able but finding >> pin#1 is impossible for me even using 7X eye loupe. I know JL will say >> it is no problem with his $3K Mantis and others are so rich that they >> hire a tech but I am not in that group. There's got to be an easier >> way, say <$300. >> Former member needs help; >> Harry D. > > Hi, Harry, > > I thought everyone who works in today's electronics had garnered for > himself at least one zoom stereo microscope. They usually go for about > $200 at flea markets here in Silicon Valley (San Jose, CA). On Ebay they > might be a little bit more. The new Celestron 44202 at $280 is in our > price range, but lacking the zoom feature is a terrible handicap. IMHO > 20X and 40X power levels are much too high for most electronics work - - > I find myself using 7X most of the time. Over the years, I've > encountered enough industrial salvage to populate every work bench I own > with at least one Bausch & Lomb Stereozoom 4, and more recently I had > the good fortune to spot an Olympus ZS4045 with a pair of Olympus > GSWH10X/22 eyepieces and a ringlight for $160. The view through that > thing is breathtaking! Looking through these instruments, if something > is written, you'll be able to read it. They open up whole new worlds of > possibility in electronic and almost any other area you can imagine. I > find one almost indispensable for removing a sliver! I'm sure I'm not > telling you anything you don't already know when I say, "If you can see > it, you can do it". > > I just looked at Ebay - - don't buy one with 15X eyepieces - - 10X > eyepieces are what you want. It should be complete with a stand - - > there's a very nice 0.7X - 3X with 10X eyepieces on Ebay with a glass > platform on a high-base stand that provides bottom illumination, but you > probably won't use the bottom light much - - the stand will accommodate > a Kohler illuminator for top lighting or a ringlight and they don't cost > a whole lot. Don't buy a Stereozoom 6 - - in my experience field > illumination is poor so they are not worth the extra cost. > Some of us have really maxed out our desk space with other stuff already :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 18 Dec 2009 19:46 On Fri, 18 Dec 2009 16:39:21 -0800, Joerg <invalid(a)invalid.invalid> wrote: >Jim Thompson wrote: >> On Fri, 18 Dec 2009 16:22:23 -0500, "Martin Riddle" >> <martin_rid(a)verizon.net> wrote: >> >>> >>> "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> >>> wrote in message news:g1pni5lbobvam1mberhsjqq5cqmi5mrun9(a)4ax.com... >>>> On Fri, 18 Dec 2009 15:15:52 -0500, "Martin Riddle" >>>> <martin_rid(a)verizon.net> wrote: >>>> >>>>> >>>>> "Harry D" <harryd(a)tdsystems.org> wrote in message >>>>> news:42987c77-ce23-4e80-adb8-0641bda7bebd(a)y10g2000prg.googlegroups.com... >>>>>> Gentlemen of this distingushed group, >>>>>> How do you read labels on small ICs such as the ThinSOT or DFN packs >>>>>> that are 2mm x 3mm? >>>>>> Ok, I have old eyes, soldering these pups is do able but finding >>>>>> pin#1 is impossible for me even using 7X eye loupe. I know JL will >>>>>> say >>>>>> it is no problem with his $3K Mantis and others are so rich that >>>>>> they >>>>>> hire a tech but I am not in that group. There's got to be an easier >>>>>> way, say <$300. >>>>>> Former member needs help; >>>>>> Harry D. >>>>> I use an Optivisor. >>>>> <http://www.doneganoptical.com/optivisor.php> >>>>> Get the hight power 2x or 3x lens. >>>>> >>>>> Cheers >>>>> >>>>> >>>> That's what I have. Bought my pair around 1980. I sometimes use them >>>> PLUS my reading glasses ;-) >>>> >>>> ...Jim Thompson >>>> -- >>> I'm surprised that Digikey and Mouser don�t carry these. I only see it >>> listed in Mcmaster. >>> <http://www.mcmaster.com/#headband-magnifiers/=4zmoob> >>> >>> Cheers >>> >>> >> >> Get the kids away from your monitor, then go to... >> >> http://www.analog-innovations.com/SED/OptiVisorMonster.jpg >> > >What's in that binder titled "Perfect Time!" ? A calendar that had nice pop-ups, but ceased to work at Win2K. I recently finally tossed the manual and used the binder for something else. I now use Smart Desktop Calendar Pro. The USB Specification binder is the _original_ stuff for which I have the patents (assigned to Intel, of course ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Help save the environment! Please dispose of socialism properly!
From: krw on 18 Dec 2009 20:25 On Fri, 18 Dec 2009 16:00:06 -0500, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >On Fri, 18 Dec 2009 11:41:36 -0800 (PST), Harry D ><harryd(a)tdsystems.org> wrote: > >>Gentlemen of this distingushed group, >> How do you read labels on small ICs such as the ThinSOT or DFN packs >>that are 2mm x 3mm? >> Ok, I have old eyes, soldering these pups is do able but finding >>pin#1 is impossible for me even using 7X eye loupe. I know JL will say >>it is no problem with his $3K Mantis and others are so rich that they >>hire a tech but I am not in that group. There's got to be an easier >>way, say <$300. >> Former member needs help; >> Harry D. > >Hi, Harry:- > >Us (we?) myopic folks just take off our glasses and get really, really >close. ;-) Doesn't work for me. I can see much better at about a foot with my glasses than sticking the object in my eye. ;-) Evidently I've developed a nasty astigmatism (didn't know the lens shape changed) and even drug store "cheaters" are useless. >I wonder if it's mostly the lighting that is causing problems- the >laser marking they are using these days is pretty hard to see even >under ideal conditions. Maybe a surplus fiber optic illuminator and >light it from the side? More light is good for old eyes. > >Eg. (they are probably not the best supplier, but it's a photo of what >I'm talking aboot): > >http://www.coleparmer.com/catalog/product_view.asp?sku=4150050&pfx=
From: Joerg on 18 Dec 2009 20:32
Jim Thompson wrote: > On Fri, 18 Dec 2009 16:39:21 -0800, Joerg <invalid(a)invalid.invalid> > wrote: > >> Jim Thompson wrote: >>> On Fri, 18 Dec 2009 16:22:23 -0500, "Martin Riddle" >>> <martin_rid(a)verizon.net> wrote: >>> >>>> "Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)My-Web-Site.com/Snicker> >>>> wrote in message news:g1pni5lbobvam1mberhsjqq5cqmi5mrun9(a)4ax.com... >>>>> On Fri, 18 Dec 2009 15:15:52 -0500, "Martin Riddle" >>>>> <martin_rid(a)verizon.net> wrote: >>>>> >>>>>> "Harry D" <harryd(a)tdsystems.org> wrote in message >>>>>> news:42987c77-ce23-4e80-adb8-0641bda7bebd(a)y10g2000prg.googlegroups.com... >>>>>>> Gentlemen of this distingushed group, >>>>>>> How do you read labels on small ICs such as the ThinSOT or DFN packs >>>>>>> that are 2mm x 3mm? >>>>>>> Ok, I have old eyes, soldering these pups is do able but finding >>>>>>> pin#1 is impossible for me even using 7X eye loupe. I know JL will >>>>>>> say >>>>>>> it is no problem with his $3K Mantis and others are so rich that >>>>>>> they >>>>>>> hire a tech but I am not in that group. There's got to be an easier >>>>>>> way, say <$300. >>>>>>> Former member needs help; >>>>>>> Harry D. >>>>>> I use an Optivisor. >>>>>> <http://www.doneganoptical.com/optivisor.php> >>>>>> Get the hight power 2x or 3x lens. >>>>>> >>>>>> Cheers >>>>>> >>>>>> >>>>> That's what I have. Bought my pair around 1980. I sometimes use them >>>>> PLUS my reading glasses ;-) >>>>> >>>>> ...Jim Thompson >>>>> -- >>>> I'm surprised that Digikey and Mouser don�t carry these. I only see it >>>> listed in Mcmaster. >>>> <http://www.mcmaster.com/#headband-magnifiers/=4zmoob> >>>> >>>> Cheers >>>> >>>> >>> Get the kids away from your monitor, then go to... >>> >>> http://www.analog-innovations.com/SED/OptiVisorMonster.jpg >>> >> What's in that binder titled "Perfect Time!" ? > > A calendar that had nice pop-ups, but ceased to work at Win2K. I > recently finally tossed the manual and used the binder for something > else. > > I now use Smart Desktop Calendar Pro. > I am still using dead trees. Never warmed up to the PDAs and all that. Actually, I am right now punching holes into next year's refill from OfficeMax because the Danish system I use has the six rings in other locations than any US daytimer :-( > The USB Specification binder is the _original_ stuff for which I have > the patents (assigned to Intel, of course ;-) > Can't rival that. But some of my stuff will now go into space :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |