On Sat, Nov 26, 2011 at 2:13 AM, gary li...@lazygranch.com wrote:
At sane temperatures, OSCONs are very good. Who runs their gear hot enough
to boil water?
National Fire Protection Agency (NFPA) 2007 edition of their design
regulations state the electronics worn by Fire Fighters must work at
On Thu, Nov 24, 2011 at 6:19 AM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
Has any of you played with this:
http://www.sparkfun.com/products/8238
Anyone look at the the one from Parallax that Radio Shack is selling
for less than $50?
On Fri, Sep 16, 2011 at 2:36 PM, Hal Murray hmur...@megapathdsl.net wrote:
x...@darksmile.net said:
You can forget Wall St. firms and Banks for starters.
They need sub-microsecond accurate timing as some instruments (Forex) are
moving to 10 microsecond latency from order entry to order
Since it's a short run, I suspect the per run charges (machine setup and
screens) will be a significant part of what would be paid.
See what I wrote on my blog sometime ago Is there a rule of thumb for
estimating the cost of getting circuit boards assembled?.
On Fri, Mar 25, 2011 at 5:29 PM, Bob Camp li...@rtty.us wrote:
I don't see a way to reasonably ship a solder mask with each board. I agree
it would be neat, but it would cost ...
Solder Stencil actually. The mask is part of the board.
Low use stencils are $25:
On Fri, Dec 31, 2010 at 11:18 AM, William H. Fite omni...@gmail.com wrote:
Maybe we should cut these cartographers a little slack. When you consider
that Garmin will sell you a map update of the entire northern hemisphere for
eighty bucks, we perhaps shouldn't get too wadded up if they miss
On Thu, Nov 18, 2010 at 11:55 AM, Corby Dawson cdel...@juno.com wrote:
Are there any terminal programs out there that allow you to select rates
other than the standard values?
https://sites.google.com/site/terminalbpp/
Select 'Custom'.
--
http://blog.softwaresafety.net/
On Tue, Oct 19, 2010 at 10:14 PM, Bill Hawkins b...@iaxs.net wrote:
As I understand it, 60 KHz information is so slow that phase
information is critical.
Take a look at the Synchronous Demodulator that is listed with the
Black Hole Ant. info.
http://www.unusualresearch.com/Sutton/sutton.htm
On Tue, Oct 19, 2010 at 7:16 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
But then again, avoid the issue and go for a black hole antenna amplifier.
I've been gathering information on Black Hole Antennas for a while on
my web site:
http://www.unusualresearch.com/Sutton/sutton.htm
On Sun, Aug 29, 2010 at 7:56 PM, Didier Juges did...@cox.net wrote:
I'll dig them up and see if anyone could host them on a website. (Files
are quite large!)
It would be great if you could upload these to the Manuals page at
www.ko4bb.com.
That would be great. If the files are really big
On Thu, Aug 12, 2010 at 6:45 PM, J.D. Bakker j...@lartmaker.nl wrote:
To start with the context: I'm planning to use a microcontroller with a
built-in dual 12-bit 2MSPS ADC.
That sounds like it is an Atmel XMega part. Do make sure you read the data
sheet errata section, as some parts in the
On Sat, Jul 17, 2010 at 5:17 AM, Neville Michie namic...@gmail.com wrote:
I have had problems with TBolts on PCs. The COM port assignments seem to be
a bit volatile,
plug in a different mouse or other user and you may find the COM port has
been assigned to it.
I have never been able to
On Thu, Apr 15, 2010 at 8:08 PM, Hal Murray hmur...@megapathdsl.net wrote:
I've got a Garmin GPS 18 USB. (18, not 18x) It's inside. I'm not surprised
when it fades out.
At first, I thought it was just giving a garbage location while trying to
find some satellites, but now that I've
On Thu, Feb 18, 2010 at 7:26 AM, Bob Camp li...@cq.nu wrote:
It is amazing just how much stuff that's normally up for sale is missing at
the moment.
It is EBay's goal to drive out any small sellers, they only want the
big power sellers now.
Look at the EBay forums and you see that the small
On Sat, Feb 20, 2010 at 4:33 PM, Gerhard Hoffmann dk...@arcor.de wrote:
Rick Karlquist wrote:
Fortunately, there is a paper copy of the 1989 Anzac catalog
in the N6RK technical library. Not everything is on the
internet. The patent number is:
3,624,536
go to http://www.pat2pdf.org/,
On Mon, Feb 8, 2010 at 8:40 PM, Bob Camp li...@cq.nu wrote:
I assume that you are going to have to train your loop to expect the ID
shifts and time
markers. Again, they are predictable.
Would it not be easier to use the WWVB Zero-Crossings to sync something?
Then the power shifts should not
If you are looking for massive tables on the cheap, you can indeed build them.
The only real drawback is that it's a build in place item. You aren't going
to take it with you when you move. There are various versions of that table
scattered all over the US.
My work bench is two 2 thick,
On Sat, Dec 26, 2009 at 8:23 AM, Ronald Held ronaldh...@gmail.com wrote:
I read about this a while ago.
Researcher Time Line Translations were explained here a few days ago:
http://www.xkcd.com/678/
The mouse-overs always have interesting comments...
--
http://www.wearablesmartsensors.com/
On Thu, Dec 24, 2009 at 3:24 PM, Scott Newell new...@cei.net wrote:
At 01:57 PM 12/24/2009, saidj...@aol.com wrote:
No need for that, just buy all ~18 million tickets (would cost $18 million
in the US) if the jackpot is ~$60 million or higher, which it often is...
To improve your odds in
What he has discovered, with the aid of a spreadsheet, is that when the 6
winning numbers are announced, they usually sum to a number somewhere in the
range 130 to 170. Very rarely is the sum very low or very high.
Gail Howard has written books and 'wheels' on this system.
--
Some researches is about to measure the change of universal constants as
universe expands.
Time and Spacetime: The Crystallizing Block Universe
http://arxiv.org/abs/0912.0808
The nature of the future is completely different from the nature of
the past. When quantum effects are significant, the
Just one little wire that's not tied into the system provides a path
that will let damaging currents come in through any other wire, no matter
how well protected they are.
I had one strike here that came *up* out of our 300 foot deep water well,
when a tree several hundred yards away took a
The part might look wrong without this information. One case was a 3.15A
fuse in series with a 27R resistor at the 28V supply input. The fuse can
never blow (no the aircraft didn't have 115V 400Hz supplies).
The reason was a pater exercise to obtain intrinsic safety approval without
formal
I assume that in time better grade capacitors will work their way into the
manufacturing world.
Counterfeit electronic parts have become the newest business model
in some circles. The problem is getting worse.
--
http://www.wearablesmartsensors.com/
http://www.softwaresafety.net/
A 33.31 format would buy us a century, still allow us to get
nanoseconds right, but it be computationally inconvenient and
looks messy, so people balk at it.
Anything wrong with TAI64NA?
http://cr.yp.to/libtai.html
libtai is a library for storing and manipulating dates and times.
libtai
I'm not out to start any kind of OS war here, I'm simply curious
as to alternatives.
On Fri, May 15, 2009 at 12:02 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
... which you can read more about in my paper from 2002:
http://phk.freebsd.dk/pubs/timecounter.pdf
Anyone know how
On Sat, May 16, 2009 at 9:21 AM, Chuck Harris cfhar...@erols.com wrote:
Bob Paddock wrote:
Anyone ever look at Minix-III (Minix-I was the progenitor to Linux)?
Seems like it would be easy to make a decent time server, on
embedded hardware with it. Past iterations of the Minix-III website
I think there is more use of microkernels (eCos, RTEMS, Erlang, etc.) in the
embedded world. The environment is more constrained, so reducing the
footprint is useful.
There is also the new µC/OS-III (yes, three) that provides near zero
interrupt disable time. µC/OS-III has a number of internal
I'm thinking about, for example, stock trading where the first bid wins.
Sub-second resolution is needed there, I think.
Advanced Message Queuing Protocol (AMQP) is what is used in
some big brokerage firms.
http://jira.amqp.org/confluence/display/AMQP/Advanced+Message+Queuing+Protocol
If you have ever been on the other side of an ITAR investigation, you
would rightly conclude that it isn't safe to do anything other than scrap
and destroy US surplus materials... which is precisely what they want you
to do.
In a past life I designed Coal Mining Equipment, back when the
Beware, programmers have turned to screaming, blithering idiots with bits of
their brains
oozing out all of their orifices just by glancing at that page.
Worse than writing a Web Server in the language BF? The B stands
for Brain, and I'm not going to put the F on a family oriented list
The cubicle?
Anti-Productivity Pods: Cubicles as Dilbert so astutely noted.
For my money the most important work on software productivity in the
last 20 years
is DeMarco and Lister's Peopleware (1987 Dorset House Publishing, NY
NY). For a decade
the authors conducted coding wars at a number
Bruce, very interesting. I didn't know capacitive sensors went down
that low. That could be useful in other areas.
I searched google but found nothing. Do you have any urls?
http://www.eetimes.com/showArticle.jhtml?articleID=175801455
EE Times: SENSORS: Quake detector preps for
any ARM7 outperforms the best PIC in price and performance :)
http://beagleboard.org/
Get them from DigiKey, $149.
http://dkc1.digikey.com/us/mkt/beagleboard.html
The USB-powered Beagle Board is a low-cost, fan-less single board
computer utilizing Texas Instruments' OMAP3530 [ARM]
On Thu, Aug 7, 2008 at 5:59 AM, Peter Vince [EMAIL PROTECTED] wrote:
It may be possible to stack 3 low ESR super capacitors in series
(maximum voltage rating is around 2v -2.5V those with higher ratings are
actually series connected stacks) to do this but this is a relatively
expensive
Jitter specs assume a logic
waveform input, not a sine wave input. Many jitter specs refer to
pattern jitter of data, which does not apply to clocks. Also, jitter
increases at low frequencies in practice, even though in theory it
should not. Like I said, this topic is very tricky.
How
Can you point me to a Time-Nut grade Zero Crossing
circuit that I can feed a Actel Igloo FPGA (It doesn't
like sine waves)?
For the sake of discussion the source signal
is a ThunderBolt at 10 MHz.
The FPGA is rated to 350 MHz, so no need to have
a 5. GHz Zero Crossing circuit.
I keep wondering if not a passive oven (metal box, insulation, metal box)
would be sufficient.
Large metal reflectively lined thermos bottles are worth considering. You do
end up with a lot of long skinny circuit boards that way.
Peltier based thermoelectric cooler's from Big Box Stores can
There are usually some BNC bulkhead connectors on eBay that terminate
in SMA/SMB/SMC pigtails, which are great for panel mounting.
Not directly related to this design, but it made me wonder about something.
If you are building a multiple output system and channel phase to channel phase
was
The CPLD's (unlike the FPGAs) are single chip solutions.
There are many single chip FPGA solutions today from several different
companies.
If you are in the US and near a Avnet office you can pick up a Actel
Igloo Icicle
eval. board/programmer for $49. They are giving them out at the Actel
On Monday 07 July 2008 02:10:35 am David Smith wrote:
I'm aware of those, but the next new USB serial device you plug in will
still be the next higher number. It is the counter for this number I've
not been able to locate.
I've just sorted this problem on another thing I was doing,
On Sun, Jul 6, 2008 at 11:57 AM, Arnold Tibus [EMAIL PROTECTED] wrote:
Hello all Thunderbolt enthusiasts,
Thunderbolt Monitor does show all the assigned ports at the right side
column for com ports 1 to 16.
A tip for anyone that might be designing software. Don't put a fixed limit
on the USB
In the device manager, choose View: Show hidden devices. The grayed
out devices have once been, but are no longer, connected to your
machine. Remove the ones that you no longer care about. You can also
remap the comport-numbers in the properties of the serial port devices,
use the button
A very minimal controller might be an AVR Butterfly. It only has a 6
character display and joyswitch. Rather not up to the task,
There is the newer DB101 with the 128x64 bit map display.
http://www.atmel.com/dyn/Products/tools_card.asp?tool_id=4221
I think they really did a botched job on
On Friday 04 July 2008 03:07:47 pm Chuck Harris wrote:
Well, yes. The Earth expands from the heat, rotation slows,
and we get another leap second - as we watch symptom after
symptom occur while being unable to come to consensus on
what to do.
I say that we take up the issue with the
On Monday 02 June 2008 02:19:52 pm David C. Partridge wrote:
I'm now thinking ahead to the PCB requirement...
http://focus.ti.com/lit/an/scaa082/scaa082.pdf
http://www.ti.com/litv/pdf/scaa082
Application Notes Abstract
High Speed Layout Guidelines
This application report addresses high-speed
Since I am well familiar with the Analog Devices DDS circuits, this has
been my very first idea. The most simple one for that purpose would be a
AD9851 (180 MHz, 32 Bit, built in clock multiplier). But when I used the
DDS design tool available on the AD web pages I received a big warning
On Monday 02 June 2008 02:31:18 pm Patrick wrote:
I have wanted to fabricate my own PCBs for several years now but I have
never made an attempt. I am set up here to do silk screening and I have
ovens and a hot-air soldering iron. Has anyone else tried to fabricate
their own boards or is the
On Monday 02 June 2008 04:53:17 pm [EMAIL PROTECTED] wrote:
Not the cheapest, but great for professional proto's when quality trumps
cost (above 1GHz, one source FR4 is totally different from another sources
FR4...)
Anyone have suggestions for Metal Core Protype Boards?
Used in high power
How do you cope with SMT parts (eg high frequency ADCs) with metal
thermal transfer /ground connections under the package itself?
How to succeed the first time with ultra-small QFN packages
http://www.wirelessnetdesignline.com/showArticle.jhtml?articleID=202800018
On Tuesday 27 May 2008 11:31:49 pm Patrick wrote:
I tried to use a cheap IR thermometer to do some quick, pre-circuit
analysis tests, a couple of years ago on a particular job.
It went bad, the laser did not even line up with the area being
measured, I missed a burning hot capacitor and
Does anyone has some nice software that will easily plot a csv file. I do
need to be able to change the vertical scale rather than have it autorange.
http://ploticus.sourceforge.net/doc/welcome.html
--
http://www.wearablesmartsensors.com/
http://www.softwaresafety.net/
On Wednesday 20 February 2008 11:53:23 am Chuck Harris wrote:
I doubt it, the audience of these two devices is quite different.
The 6805 family could address 64K external RAM/ROM/IO.
Not sure what device you are describing, but it is not a 6805.
I cannot imagine what lesson they needed to
On Monday 28 January 2008 08:19:40 am Patrick wrote:
I rebuild and resell lab instruments. My customers are doing great work
finding cures for diseases. The software to control their instruments
cost between 5-40K and is hyped up garbage that eats up their meager
budgets. I desperately,
On Thursday 13 December 2007 09:47:36 pm Bruce Griffiths wrote:
Matt Ettus wrote:
Can you explain to me the use of fast recovery diodes if you are going
to put capacitors across them?
Even with the snubber networks the reverse conduction time of the fast
recovery diodes is considerably
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
On Sunday 05 August 2007 12:13, Poul-Henning Kamp wrote:
We found the best waveguide experience was in
the range of 300 to 420 MHz, but the distance is very limited,
hundreds of feet at most. The main problem at different
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
On Saturday 04 August 2007 23:54, Thomas A. Frank wrote:
Ah, but what if one used the tunnel itself as a waveguide, and
propagated an RF signal down it?
For many years I designed Coal Mining Equipment, I can
tell you from
); SAEximRunCond expanded to false
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On Friday 03 August 2007 07:22, Pablo Alvarez Sanchez wrote:
At CERN we are considering the possibility of using Ethernet as a real
time field bus.
There are a couple of projects that have already gone down this road,
for
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED]
On Friday 27 July 2007 04:14, Dr Bruce Griffiths wrote:
22GHz,
(15GHz)
(~40.5 GHz) than either the caesium
(9.192GHz) or rubidium
(6.8GHz)
Anything happening in the THz range, that anyone knows of?
--
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED]
On Saturday 30 June 2007 10:15, Dr Bruce Griffiths wrote:
Not true, there's nothing magic about amplifier saturation, any means
that limits the amplifier output whilst dropping the small signal gain
to a low value will have
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED]
These devices are a little noisy below 100Hz.
Rather than constantly battle the there is to much noise, what are
your thoughts on deliberately injecting out-of-band noise?
As an example:
For anyone with interest in C-Max's Time Receiver products,
my Sales Rep. for C-Max forwarded this message
from their boss yesterday:
C-Max filed Chapter 11. Do not sell any longer!!
Their old site:
http://www.c-maxgroup.com/home/index.php
refers to a new site:
http://c-max-time.com
Both
On Monday 30 April 2007 11:00, Brooke Clarke wrote:
I think the crew from what was called Temic has formed a new company called
C-MAX.
Here is their web site:
http://www.c-maxgroup.com/home/index.php
Their parts, and ~$30 evaluation module, are available from
DigiKey.
They do sell a
On Monday 23 April 2007 03:56, Don Collie wrote:
The thing that puzzles me is: why is the plot of
VCO voltage versus time different when locking from below to locking from
the same initial frequency difference when locking from above. It`s a pity
you can`t predict PLL lockup
I await Bob Paddock's circuit with bated breath.
Found a copy of the circuit I had in mind on line, look at figure #25:
http://www.linear-tech.co.jp/pc/downloadDocument.do?navId=H0,C1,C1155,C1001,C1158,P1442,D1594
That circuit has a few problems, it is also based on ten year old parts.
One
On Monday 09 April 2007 01:16, Dr Bruce Griffiths wrote:
The attached table of logic gate propagation delay jitter should prove
somewhat challenging to verify with a time interval counter or similar
device.
Then don't use them.
Does anyone have any other practical method of measuring such
On Tuesday 03 April 2007 21:48, Dr Bruce Griffiths wrote:
An Australian Electronics magazine recently published a circuit for a
GPS disciplined crystal oscillator.
This particular implementation is the worst I've ever seen.
What would you consider the best you have ever seen?
--
On Sunday 01 April 2007 11:30, Chuck Harris wrote:
Metric vs. English has nothing to do with making things easier, but
rather has everything to do with which arbitrary constants you prefer.
Here is a question that has nagged me for years, but first
the background:
When I was in school getting
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