That price differential is definitely a big reason why I don't use that sort of adapter board. A $5 chip in a $12 adapter is just crazy. I could be spending that same money on trying out this or that nifty part...
But like Chris pointed out, for BGA it would make sense. No way am I going to try hand soldering those. ;) ----- Original Message ---- From: paul swed <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Fri, February 25, 2011 9:51:03 PM Subject: Re: [time-nuts] VCXO help Boy even though they are $12 for larger packages I would need them. It is so easy to create solder bridges. I can get away with direct connections to 14 pin or less and honestly have to say about 10. It seems crazy because the micro as an example might be $5. But thats the reality. regards Paul On Fri, Feb 25, 2011 at 3:20 PM, Chris Albertson <[email protected]>wrote: > On Fri, Feb 25, 2011 at 11:02 AM, Tijd Dingen <[email protected]> > wrote: > > Hello Chris, > > > > No I didn't know SchmartBoards, thanks for the tip. > > > > Although maybe I am missing something... I just checked their site, and > > watched the videos, but I couldn't find anything I'd spend $12 on. > > > > When you say that it is "expensive at $12 each, but you need only one", > > do you mean that as "you only need to buy one gizmo once and you can > > reuse it to solder multiple different QFNs for several of you > prototypes"? > > No I meant one per project or one per chip > > If you can solder these by hand to a PCB you don't need this. > "SchmartBoards" are for people who can't. the little boards are just > breakout boards. You solder the chip to the SchmartBoard and then > each lead goes to a larger through hole that is easier to use. > Basically it turns a QFN chip in to a part with .1" lead pitch. > > Their innovation was to use a router to mill out the PCB so the chip > self-aligns and can't slide off the pads, so like I said you can > solder it with eyes closed. The traces going to the pads are in > little trenches with fiber/epoxy walls between so you can't make a > solder bridge > > The traces on the PCB are actually milled out trenches that are filled > with solder. You place the chip in the board then place the solder > iron some distance from the chip and the solder in the trench melts. > These are aimed at someone who wants to prototype with SMT components > > Maybe you don't need this is you can hand solder QFN but hand > soldering BGA is hard and they have these for BGA too. > > -- > ===== > Chris Albertson > Redondo Beach, California > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
