What I was talking about was the process to move the project forward,
not design or requirements details. So my list of moduals was just
to show what a list of modulas might look like, not to suggest those
exact ones.
Jumping ahead to design. No one wants a serial RS232 interface. they
don't ev
A cursory look around produced counters and dividers from:
http://www.lsicsi.com
There are probably comparable units available elsewhere. I know that rfbay
has some microwave dividers, and Hittite as well, although Hittite is a
bit expensive.
Don
--
"Neither the voice of authority nor the weigh
Very good points.
For the core counter, are you talking about an interval counter or a
more generic two input, tell the CPU what to do with the inputs kind
of model? :)
USB certainly would be the interface of choice, but serial also has
it's place. The joy is there is less software to write. That
You can't do anything, not even guess at a price until you have a list
of requirements written down. And they need to be detailed.
I would break the project down into a set of sub-projects possably like this
1) The "core" counter, just counts, no pre scaler, no display or
reference oscillator. c
One way to find out if people are interested enough to pledge some money
up front is something like this project
http://www.kickstarter.com/projects/bushing/openvizsla-open-source-usb-protocol-analyzer
Alan
On 12/16/2010 12:55 PM, Bob Camp wrote:
Hi
If you look in detail at the ups and downs
>From the sounds of it, I'd guess there are enough folks here that
could put a QFP or two on boards for those less sure of their talents.
That makes doing a run of a dozen or two of anything non bga wouldn't
be an issue. As Xtof pointed out, a controller (or a good eye) and an
old toaster oven can
Hi
If you look in detail at the ups and downs of the TAPR SDR project, it's not
one I would want to emulate.
If we have a few hundred people interested with cash in hand, this might
indeed make sense.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@feb
Hi Chris,
Yea, modularity is surely a good way_
I think the most problematic component is the FPGA-eventually memories for
that as a host "CPU", the rest can be relative similar, basically good
documented interfacing for some other PCBs...
Karesz
2010/12/16 Chris Albertson
> Here is an example
Here is an example of doing something like this as a open source
design by a group of HAMs
http://www.tapr.org/kits_janus.html
This is a software defined radio but is close to the complexity we are
talking about here. It has a d/a converter and fpga and lots of
surface mount parts. TAPR is able to
You've probably already discovered this site, but in case you or others
haven't, I get my Arduino goodies from here -
http://www.adafruit.com/
and a related site -
http://www.ladyada.net/
I've ordered twice and it was quick and easy to Canada
Darrell
On 10-12-14 10:19 PM, Bruce Lane wro
LFCSP (QFN) with 0.5mm spacing is very easy to do... have done about a dozen
(AD9912) with nil failures using just solder paste, a $50PID controller
and a $20
oven. refs all around on the web. You may get a bridge here and there
but you can
wick them away ;-) easily.
QFP has leads so is even ea
Hi
To get the boards down to a reasonable price, you need to have a project
with broad appeal. Spreading $2K setup charges across four boards isn't
going to work out very well.
The real answer is to find somebody with a good vision system on their
basement pick and place system.
Bob
-Origi
Hi Bob,
Clear, itsn`t everybodys "thing", but you can belive me, that an BGA, even
with 1mm pitch too, is really nothing for a home lab...
Otherwise, I have in the past years hand soldered lot of 0.5mm pitch
connectors & QFP ICs too, its not the holyday job for me, bud with a litle
experience is d
Hi
>From what I have seen of hand soldered 0.5 mm spaced / several hundred pin
packages - not very easy at all, even with pro gear and pro soldering
people. Based on the adverse reaction on the list to 14 pin 1 mm spaced
parts, I don't think there's much chance of a big QFP being popular.
Bob
--
One can get a lot of FPGA capability in a 200+ pin PQFP package, so let's say
that package is adequate. Then there is no need for a custom circuit board.
SchmartBoard has a standard 240 pin PQFP board for $20
(http://www.schmartboard.com/index.asp?page=products_qfp). They have BGA boards
as wel
I recall reading an article like this with a formal analyses of
various quartz watches. In this NIST worker's analysis, the Timex
was most accurate.
http://tf.nist.gov/general/pdf/2276.pdf
The other article I read had a similar conclusion but was not as
quantitative, and localized body heat
Hi Bob,
If a 256 ball package is the solution for these FPGA, I would prefer it in
256 QFP-package version-if exists.
These will be solderable for the good "home-specialists", bat a BGA (even
with "only" 256 balls) is a real problem for home labs...
Karesz
2010/12/16 Bob Camp
> Hi
>
> Yes inde
Hi
Yes indeed, been there done that. Not very hard at all.
All you need is the six layer pc board (can be bought), the FPGA (Digikey
has them), a few of these and a couple of those. Spend less than $100 and
you are in business if the PC board volume is high enough.
In this case the next step in
And don't forget the AtMega88 - not as much memory but you can still
pack a lot into it. I think the original Arduino was based on the 88 and
the bootloader is still available meaning you can build an Arduino
compatible board using the 88, you may still be able to by the 88 chip
with the bootload
Hello Greg
Many thanks for your response.
At least I learned something..
Do you have any idea where I can get this part (GPS synchronizer Model
8901-1 ) ?
Do you familiar with any suppliers of TRAKs old products , cause they do not
produce it anymore .
Thanks again
Regards,
Alex
On Thu, De
20 matches
Mail list logo
