On Fri, Nov 25, 2011 at 1:21 PM, Robert Atkinson robert8...@yahoo.co.ukwrote:
Hi,
Microchip cerainly condone using input protection diodes of PIC devices as
clamps. There are application notes for zero-crossing detection which
connect the input to the 115V AC line via a resistor. Note that
In message cabbxvhvnsaxbx5uorjtqesttd50yedyavkgxh52bpspuayt...@mail.gmail.com
, Chris Albertson writes:
One question: How does one avoid using electrolytic caps if you need
(say) 1,000uF or even 100uF. Those would be some mighty big film caps.
One detail, often overlooked, is that
If you do a test, let us know your findings.
I think the answer will depend upon how good the location is. If the
limitation is ionosphere delays, two units near each other should have
similar errors. If the limitation is multipath, being near each other
probably won't help much.
---
Hal,
Those sure look like GNU plot graphs :)
Sorry, i didn't mean to change subjects but i do like gnu plot.
Steve
On Sat, Nov 26, 2011 at 4:20 AM, Hal Murray hmur...@megapathdsl.net wrote:
If you do a test, let us know your findings.
I think the answer will depend upon how good the
- Forwarded Message -
From: Robert Atkinson robert8...@yahoo.co.uk
To: Orin Eman orin.e...@gmail.com
Sent: Saturday, 26 November 2011, 12:21
Subject: Re: [time-nuts] Clocking a PIC16F628A from a Rubidium Standard
Hi,
Absolute max I understand, but even at 10% of Abs max you have
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
Hi Justin,
You are not the only one! I have a Thunderbolt and a couple of iPaqs. The
program looks great. I'm considering gutting a unit and building it into the
case with my T-Bolt. They are available used at minimal cost.
Thank you for making this avialable.
Robert G8RPI.
Thanks Robert.
Another fellow also replied privately with the enclosure idea. That sounds
like a good idea, but make sure you leave some way to punch the reset
button on the bottom of the iPaq from outside the case. Before I got
shutdown working, that was the only way to get the serial port
On 11/25/11 9:56 PM, Steve . wrote:
I'm curious as to what folks are doing with PC's that require micro second
accuracy for days or weeks or what have you.
Any examples?
not microseconds, but milliseconds...
Running multi-day tests in a spacecraft testbed where you've got
PC-based test
Hijacking my own thread back here :)
Thanks for tip - I did know about Skycraft, and I think there was another in
the Orlando area, but I wasn't able to make the trip over that way before I had
to leave town.
Back on topic though, if anyone has an old catalog, or some other source of
info on
Quoting Poul-Henning Kamp p...@phk.freebsd.dk:
Has any of you played with this:
http://www.sparkfun.com/products/8238
www.gpscreations.com/Products_GPS1A.html looks like a version you can
still purchase. But for the $500 they want I'd spend a little more and
get a real SDR
On Nov 25, 2011, at 3:55 PM, Justin Pinnix wrote:
A while back, I scored an old Compaq iPaq Pocket PC for cheap at an
auction. Recently, I wrote a program for it that reads the time and health
information from a Thunderbolt and displays it in real-time. More info
available here:
I was going to ask a similar question as I have a Fujitsu Siemens LOOX 420
pocket PC. Wouldn't probably make more than £10 on EBay, so it's worth more
to me to do something like this with it.
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com
Come on, folks. never hook anything directly to the power line. The
source is just too stiff. Use an opto. I used fiber optic isolation with
my big DC power supply.
Don
Orin Eman
On Fri, Nov 25, 2011 at 1:21 PM, Robert Atkinson
robert8...@yahoo.co.ukwrote:
Hi,
Microchip cerainly condone
Off topic: Actually, you can make almost anything withstand almost
any conditions TEMPORARILY - it depends on the packaging too. If you
wrap a circuit that can work at 100 deg C in a water jacket wrapped
in high temperature insulation, you can keep it going until most of
the water has boiled
On Nov 26, 2011, at 10:36 AM, Don Latham wrote:
Come on, folks. never hook anything directly to the power line. The
source is just too stiff. Use an opto. I used fiber optic isolation with
my big DC power supply.
I don't disagree on isolation. I will say that Atmel's (and presumably
On Fri, Nov 25, 2011 at 9:56 PM, Steve . iteratio...@gmail.com wrote:
I'm curious as to what folks are doing with PC's that require micro second
accuracy for days or weeks or what have you.
The way you get the reliability is easy, it just cost money. You set
up multiple servers each with its
How did such a trivial circuit function for a one-unit application
trigger such a large philosophical discourse? I guess I'll put my
one-cent's worth in too. If you were designing to make a
mission-critical item, or millions of units, then every part and
every penny would count, so the finesse
On Fri, Nov 25, 2011 at 10:36 PM, Raj vu2...@gmail.com wrote:
How about this way: Amplifying capacitance.. (Base/Ground cap * Beta)
http://sound.westhost.com/project15.htm
The above actually uses several quite large electrolytic. It is a
good example of why you NEED to use them.
Maybe
Maybe you can figure out for use how long one must average the data to
get down to a given position accuracy. The fact that you have a poor
location is good. You are generating real-world numbers.If I use
my GPS I find the location never moves more then a few inches at most.
I have a roof
Hi,
Runs OK on both my HP iPaq H2200 (Pocket PC 2003 Ver. 4.20)and Compaq iPaq 3950
(Pocket PC 2002 Ver. 3.0)
Robert G8RPI.
From: Kevin Rosenberg ke...@rosenberg.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent:
Come on, folks. never hook anything directly to the power line. The
source is just too stiff. Use an opto. I used fiber optic isolation with
my big DC power supply.
Don
I used to agree, until actually tried it myself. Now this is how
I do my picPET 60 Hz data logging:
Simple 60 Hz AC Mains
Gee. I have an old Jornada palm with windows CE. Might work if i gan
generate a serial interface?
Don
Robert Atkinson
Hi,
Runs OK on both my HP iPaq H2200 (Pocket PC 2003 Ver. 4.20)and Compaq
iPaq 3950 (Pocket PC 2002 Ver. 3.0)
Robert G8RPI.
From:
well, grudgingly. only need the 1 meg to the hot side of the line, no
connection to the neutral needed, with 1 meg in there, normal ground
connections are going to supply the low side...It still lurks...
Don
Tom Van Baak
Come on, folks. never hook anything directly to the power line. The
source
Hi Don:
Not a good idea. There are a number of fault conditions that can cause Neutral to be tens of volts above ground. Tom's
circuit with a Meg in both the Hot and Neutral lines is much safer for you equipment.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Maybe you can figure out for use how long one must average the data to get
down to a given position accuracy. The fact that you have a poor location
is good. You are generating real-world numbers.
I'll be glad to provide lots of crappy data if anybody wants to play with it.
--
On 25 Nov, 2011, at 21:56 , Steve . wrote:
I'm curious as to what folks are doing with PC's that require micro second
accuracy for days or weeks or what have you.
Any examples?
Curious,
Steve
I have a PCI-X board with an FPGA which implements a clock running
at 320 MHz. The 320 MHz can
On 11/26/11 11:13 AM, Chris Albertson wrote:
On Fri, Nov 25, 2011 at 10:36 PM, Rajvu2...@gmail.com wrote:
How about this way: Amplifying capacitance.. (Base/Ground cap * Beta)
http://sound.westhost.com/project15.htm
The above actually uses several quite large electrolytic. It is a
good
This area (SW Pennsylvania) we do not have galvanic ground distribution. So
when a neutral is damaged all the load is forced back to the ground near
the source. After some time the ground rod is completely corroded and does
not provide a reliable earth sink.
At this point there is no earth, and
Sorry, Brooke-I was not clear. I meant to not connect anything to
neutral at all, but rather to depend on the ground connection already
made in the equipment for the low side of the signal, rather than a 1
meg to neutral at the plug. Sorry.
Don
Brooke Clarke
Hi Don:
Not a good idea. There are
Hi Justin,
Great stuff. I have several iPaqs and a Thunderbolt so I will be giving
this a try. I've been saving several iPaqs for just such a possibility.
I'm not very adept at programming but I did manage to program a simple
calculator for my iPaq using MS eMbedded several years ago just to
Hi Guys,
Several questions here about models. I'll do my best to answer.
I'm using an iPaq 3825, so I know for sure it works there.
Robert reports success on the iPaq 2200 and 3950. Thanks Robert!
I looked up the Fujitsu Siemens LOOX 420. It's an ARM type processor, so I
suspect it would
On Sat, Nov 26, 2011 at 2:35 PM, Hal Murray hmur...@megapathdsl.net wrote:
Pure brute force would compute the center of mass and then scan all the data
points computing the distance... That's an N-squared process which might
take too long with a large clump of data. For offline research like
As long as you are willing to use a micro controller, I think the best
way to make a status display is to have to controller maintain a web
page. Then just about any pock device you own can look at the status
page. Sometimes it makes sense to put an LCD on a device. I
think only if the user
Or an alcohol sensor !
BillWB6BNQ
Chris Albertson wrote:
snip
GPS is never going to be exact. Or I should say you don't know the
exact lat. long. for every place you want to go. So to find something
like a bear bottle in your refrigerator you need vision
Chris Albertson
Redondo
Hi Justin:
Unsure about the Jornada - there were numerous models. If you don't
have a
serial port, that's going to be a problem. Perhaps you do and it's a
matter of cabling? Which model number is yours?
I have a 568, and there is a serial cable, also USB for sync.
I can try it out when I
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