[time-nuts] VCXO help

[Tijd Dingen]

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 <paulswedb at gmail.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
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
<albertson.chris at gmail.com>wrote:

> On Fri, Feb 25, 2011 at 11:02 AM, Tijd Dingen <tijddingen at yahoo.com>
> 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
>
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