magnetic field

Fred Bloggs · Sep 29, 2004

Frank Bemelman wrote:

"Fred Bloggs" <nospam@nospam.com> schreef in bericht
news:3FF0A1C6.4050404@nospam.com...

[snip]

Then you can work a common 5.1V zener into the equation like so:
Use a 2N3906 for the pnp for Vbe,max=6V rating.

Please view in a fixed-width font such as Courier.

6V >---+--------+----------+-------------+
| | | |
| / / |
| 22 51 |
| / / |
| \ \ c
| | | |/
| +----------|-----------| TIP31
| | | |\
| | | e----+--> 5V
| c | |
| \| | pnp |
| npn |--+-----|-------- c e---+
| /| | | \ / |
| e | | ---- |
=== | | | 180 | |
| | | +----/\/\---+ |
| | | | | |
| | | | | |
| | / _/ / ===
| | 1K /^ 5.1v 1.2K 1000U
| | / - / |
| | \ | \ |
| | | | | |
GND>--+--------+----+-----+-----------+------+--> GND

Now you're getting a bit too enthusiastic ;-) With all
these parts, I'd prefer a LM2931 for 27 cents.

http://www.national.com/pf/LM/LM2931.html

True- I am thinking in terms of what Radio Shack has in stock- don't
forget a big jumbo LED in there somewhere to indicate power
applied

-and by their prices -this would be a $10 circuit-LOL.

Robert Baer · Sep 29, 2004

jason@eg3.com wrote:

Archive-name: sci/electronics-search-faq

Electronics Search FAQ - POINTER
http://www.eetoolbox.com/search/index.htm
http://www.cera2.com/search/index.htm
http://www.eg3.com/search/index.htm

Finding Electronic Design Information On The Internet
1998.09.15
------------------------------------------------------------

This FAQ focuses on sources of information useful for electronics
and electronics design. It lists meta resources such as EE search
engines, FAQ's, Web resources, FTP sites, publications, trade
shows, and conferences. It identifies all major EE publications,
and it explains how to use the Internet as a tool for practical
electronic design. Please email suggestions to comments@eg3.com.
Thanks!

Be that as it may, but there seems to be no references for the

following IC (DDR RAM):
Maker: GET (might be a logo or interpreted as G.E.T.).
Part ID: AE25D1284T-6

I am looking for a datasheet on this item, preferably in PDF format
(english also prefered).

Jan Panteltje · Sep 29, 2004

On a sunny day (Tue, 13 Jan 2004 19:32:39 +1100) it happened Russell Shaw
<rjshaw@iprimus.com.au> wrote in <72ncd1-6i4.ln1@main.anatron.com.au>:

IIRC, there's a linux app to resize partitions without data loss. However,
you need it that infrequently that it's just easier to connect the new HDD
to the cable, format, partition, create filesystems, mount it on /mnt, then
cp -a everything onto it (except /proc, /mnt, etc). You could use dd, but
i don't know what happens to the extra space if you copy onto a larger drive.
By using cp -a, any bad blocks are avoided.

I think in modern hard disks the 'bad sectors' are mappen in the firmware of the

disk.
For the OS it seems like one long range of sector addresses of 512 bytes.
The drives perhaps have some flash memory for that?.
As far as the extra space goes, I DID copy cat /dev/hda > /dev/hdb,
and it worked (with hdb bigger a few GB).
You lose the extra space...
Maybe a play with fdisk could be done to create an extra partition in this space,
but I stopped when it was all working (sold that other system), not worth the risk.
JP

Rene Tschaggelar · Sep 29, 2004

Precious Pup wrote:

Rene Tschaggelar wrote:

Input and output reflections are independent of each other,
at least from a certain complexity up.

S12 is never 0. Design equations for simultaneous I/0 match are available.

Splitting hairs ?
I said it was dependent on the complexity. A standard OpAmp
with sufficient gain, sufficient feedback has no coupling between
the two. It ideally has infinite input impedance, zero output
impedance and with some external parts can be made to match whatever
on both sides independently.

Sure, a single transistor looks a bit different.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

Precious Pup · Sep 29, 2004

Rene Tschaggelar wrote:

Precious Pup wrote:

Rene Tschaggelar wrote:

Input and output reflections are independent of each other,
at least from a certain complexity up.

S12 is never 0. Design equations for simultaneous I/0 match are available.

Splitting hairs ?

Not really.

I said it was dependent on the complexity. A standard OpAmp
with sufficient gain, sufficient feedback has no coupling between
the two. It ideally has infinite input impedance, zero output
impedance and with some external parts can be made to match whatever
on both sides independently.

He is likely talking about an RF/microwave preamp. He didn't mention an op-amp.

Sure, a single transistor looks a bit different.

yeah, a "bit."

H. Dziardziel · Sep 29, 2004

On Fri, 23 Jan 2004 17:44:47 GMT, "kansas_ray"
<kansas_ray@hotmail.com> wrote:

Hi all,

If so, by how much? Can anyone point me to any info on the subject or pass
on any personal experience?

We can re-layout a board to use an OMRON G5V-2-H-24VDC relay in a normally
de-energized position but I wonder if it's worth the effort.

Regards,
Ray

It keeps the spring components under constant tension.

H. Dziardziel · Sep 29, 2004

On 24 Jan 2004 21:04:06 GMT, Wim Lewis <wiml@underhill.hhhh.org>
wrote:

snip

By completely failing to mention the liquid crystal itself, it suggests
that it's not terribly toxic or dangerous. But who knows.

http://home.jeita.or.jp/device/lirec/english/enviro/influence.htm
http://www.umweltbundesamt.de/uba-info-daten-e/daten-e/lcd.htm

Dbowey · Sep 29, 2004

Re: "> My oldest daughter just turned 42 :-("

This gets to be a great puzzle. My older son is 47, but I believe I am about
26. He should play at becoming 20.

I don't know when or if I shall become old.

Don

Frank Bemelman · Sep 29, 2004

"Jim Thompson" <thegreatone@example.com> schreef in bericht
news:d3kt10tkk52ccu6laninceu6cc9jeso0a9@4ax.com...

Anyone have an idea how one might output their PC clock information
though the serial (or USB) port?

My PC clock is NIST-synchronized and it would be nice to have a wall
clock with that accuracy.

You'd have to write a small program that spits out the message...
and build a clock that understands it... Or buy a clock with a
serial link of some sort, and use the provided software that
no doubt comes with it.

--
Thanks, Frank.
(remove 'x' and 'invalid' when replying by email)

WEBPA · Sep 29, 2004

Anyone have an idea how one might output their PC clock information
though the serial (or USB) port?

My PC clock is NIST-synchronized and it would be nice to have a wall
clock with that accuracy.

Any discount store...$30 or less for a "radio-controlled" or "atomic"
clock...they are also "NIST synchronized." Wall or nightstand size for about
the same price. Most are good to +/- 0.1 second or better (sometimes MUCH
better). If you're only going to read the numbers visually, few people can SEE
a 0.1 sec difference. Don't understand what you'd gain by obtaining a sync
pulse from a PC...motherboard overhead (for RS232) and that plus OS overhead
for USB may make it less accurate than your WalMart atomic clock. Unless the
computer is dedicated to running your clock. If so...

webpa

Jim Thompson · Sep 29, 2004

On 02 Feb 2004 23:24:14 GMT, webpa@aol.com (WEBPA) wrote:

Anyone have an idea how one might output their PC clock information
though the serial (or USB) port?

My PC clock is NIST-synchronized and it would be nice to have a wall
clock with that accuracy.

Any discount store...$30 or less for a "radio-controlled" or "atomic"
clock...they are also "NIST synchronized." Wall or nightstand size for about
the same price. Most are good to +/- 0.1 second or better (sometimes MUCH
better). If you're only going to read the numbers visually, few people can SEE
a 0.1 sec difference. Don't understand what you'd gain by obtaining a sync
pulse from a PC...motherboard overhead (for RS232) and that plus OS overhead
for USB may make it less accurate than your WalMart atomic clock. Unless the
computer is dedicated to running your clock. If so...

webpa

I actually designed such a chip for Bowmar, maybe 30 years ago.

My problem is I'm down in a rock-pile mini-canyon and the 60KHz isn't
strong enough.

I was planning on synchronizing maybe once an hour.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice

480)460-2350 | |
| E-mail Address at Website Fax

Charles W. Johnson Jr. · Sep 29, 2004

I actually designed such a chip for Bowmar, maybe 30 years ago.

My problem is I'm down in a rock-pile mini-canyon and the 60KHz isn't
strong enough.

I was planning on synchronizing maybe once an hour.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

What type of clock? How far from the computer to the clock? Any walls
between the clock and computer? How much free floating RF in the house? Are
you wanting a major piece of software to interface it or just a simple on
off single to the clock for signalling it's the top of a new hour? Do you
want it to report back when it has to reset?

Charles

Jim Thompson · Sep 29, 2004

On Tue, 03 Feb 2004 03:22:21 GMT, "Charles W. Johnson Jr."
<qrus19@oneimage.com> wrote:

I actually designed such a chip for Bowmar, maybe 30 years ago.

My problem is I'm down in a rock-pile mini-canyon and the 60KHz isn't
strong enough.

I was planning on synchronizing maybe once an hour.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

What type of clock? How far from the computer to the clock? Any walls
between the clock and computer? How much free floating RF in the house? Are
you wanting a major piece of software to interface it or just a simple on
off single to the clock for signalling it's the top of a new hour? Do you
want it to report back when it has to reset?

Charles

480)460-2350 | |
| E-mail Address at Website Fax

Robert C Monsen · Sep 29, 2004

"Jim Thompson" <thegreatone@example.com> wrote in message
news:7obu10tp0j1s65coa13miq87667qn85grs@4ax.com...

On Tue, 03 Feb 2004 03:22:21 GMT, "Charles W. Johnson Jr."
qrus19@oneimage.com> wrote:

I actually designed such a chip for Bowmar, maybe 30 years ago.

My problem is I'm down in a rock-pile mini-canyon and the 60KHz isn't
strong enough.

I was planning on synchronizing maybe once an hour.

If you are simply looking for accuracy, you can just build a simple receiver
for 60Hz power line emissions, and use that for the timing.

I've seen schematics on the web, but I'm sure you can come up with something
better with one lobe tied behind your back.

Regards,
Bob Monsen

CWatters · Sep 29, 2004

Take a look at the LCD panels that the case modders use to display things
like CPU temp. Most of these connect via RS232 and I'm sure some of them
must have a time display.

Jim Thompson · Sep 29, 2004

On Tue, 03 Feb 2004 05:55:01 GMT, "Robert C Monsen"
<rcsurname@comcast.net> wrote:

"Jim Thompson" <thegreatone@example.com> wrote in message
news:7obu10tp0j1s65coa13miq87667qn85grs@4ax.com...
On Tue, 03 Feb 2004 03:22:21 GMT, "Charles W. Johnson Jr."
qrus19@oneimage.com> wrote:

I actually designed such a chip for Bowmar, maybe 30 years ago.

My problem is I'm down in a rock-pile mini-canyon and the 60KHz isn't
strong enough.

I was planning on synchronizing maybe once an hour.

If you are simply looking for accuracy, you can just build a simple receiver
for 60Hz power line emissions, and use that for the timing.

I've seen schematics on the web, but I'm sure you can come up with something
better with one lobe tied behind your back.

Regards,
Bob Monsen

480)460-2350 | |
| E-mail Address at Website Fax

Charles W. Johnson Jr. · Sep 29, 2004

It's for the pizzazz ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Use preset counters to store the time. Then every 24 hours have your
computer send a single bit to trigger a reset of the counters. Works best if
you do a reset a 23:59:59 hrs . Details of the clock flipflop/counter
network not available at printing.

Charles

Mike Harrison · Sep 29, 2004

On Thu, 05 Feb 2004 11:04:54 -0600, El Meda <gomerem@hotmail.com> wrote:

testing_h@yahoo.com (Andre) wrote:

Hi,
Be aware that there is a good possibility that the TIP122 devices you
buy are counterfeit! I just got a bad batch that were not even 122's,
they were PNP darlingtons with internal resistor and diode.

The suspect devices have markings which are unusually large compared
to a genuine ST part, and come off with acetone. You may see a very
faint set of markings just above the fake ones; it appears that the
original markings have been abraded off. Possibly "R6403"

Also the suspect devices are marked as follows,

7 91
TIP122

A "real" device has the markings embossed whereas these appear
"blurred" as you would expect if they had been screen printed.

The other giveaway is that the top corners are straight whereas on a
genuine device these corners are chamfered.

-A

Thanks for the warning. I've found several counterfeit parts myself,
they can be seen at:

http://transfal.tripod.com/

The page is written in spanish, but it has lots of pictures.

---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.

It amazes me that someone would bother doing this with such a cheap part...

Nitro · Sep 29, 2004

Hi,

Sorry If this is a repeat as I came into the posting late.

I would recomend DFsee as a great disk tool.
It has clone resize, fdisk and recover functions and supports most filesystem
formats.
It will run from DOS off a 1.4M floppy.

It has a 30 day free trial. Download it from hobbes (search for dfsee)
http://hobbes.nmsu.edu

(I have no affiliation with DFsee except as a user.)

Good luck,
Bart

On Tue, 13 Jan 2004 13:43:03 GMT, Jan Panteltje wrote:

On a sunny day (Tue, 13 Jan 2004 19:32:39 +1100) it happened Russell Shaw
rjshaw@iprimus.com.au> wrote in <72ncd1-6i4.ln1@main.anatron.com.au>:

IIRC, there's a linux app to resize partitions without data loss. However,
you need it that infrequently that it's just easier to connect the new HDD
to the cable, format, partition, create filesystems, mount it on /mnt, then
cp -a everything onto it (except /proc, /mnt, etc). You could use dd, but
i don't know what happens to the extra space if you copy onto a larger drive.
By using cp -a, any bad blocks are avoided.

I think in modern hard disks the 'bad sectors' are mappen in the firmware of

the
disk.
For the OS it seems like one long range of sector addresses of 512 bytes.
The drives perhaps have some flash memory for that?.
As far as the extra space goes, I DID copy cat /dev/hda > /dev/hdb,
and it worked (with hdb bigger a few GB).
You lose the extra space...
Maybe a play with fdisk could be done to create an extra partition in this
space,
but I stopped when it was all working (sold that other system), not worth the
risk.
JP

Andre · Sep 29, 2004

Mike Harrison <mike@whitewing.co.uk> wrote in message news:<nv75209mlfpq1t1r2h2mud8hk1dsp0eeeh@4ax.com>...

On Thu, 05 Feb 2004 11:04:54 -0600, El Meda <gomerem@hotmail.com> wrote:

testing_h@yahoo.com (Andre) wrote:

Hi,
Be aware that there is a good possibility that the TIP122 devices you
buy are counterfeit! I just got a bad batch that were not even 122's,
they were PNP darlingtons with internal resistor and diode.

The suspect devices have markings which are unusually large compared
to a genuine ST part, and come off with acetone. You may see a very
faint set of markings just above the fake ones; it appears that the
original markings have been abraded off. Possibly "R6403"

Also the suspect devices are marked as follows,

7 91
TIP122

A "real" device has the markings embossed whereas these appear
"blurred" as you would expect if they had been screen printed.

The other giveaway is that the top corners are straight whereas on a
genuine device these corners are chamfered.

-A

Thanks for the warning. I've found several counterfeit parts myself,
they can be seen at:

http://transfal.tripod.com/

The page is written in spanish, but it has lots of pictures.

---
Ing. Remberto Gomez-Meda <gomerem@hotmail.com
http://ingemeda.tripod.com/
INGE - Ingenieria Electronica.
Puerto Vallarta, Jalisco, Mexico.

It amazes me that someone would bother doing this with such a cheap part...

Well, its not that cheap, the genuine devices are about 60p each. Plus
they seem to be used a lot in a number of consumer products such as
plasma lamps, also some fluorescent lanterns to name a few.

-A

magnetic field

Fred Bloggs

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Robert Baer

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Jan Panteltje

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Rene Tschaggelar

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Precious Pup

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H. Dziardziel

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H. Dziardziel

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Dbowey

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Frank Bemelman

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WEBPA

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Jim Thompson

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Charles W. Johnson Jr.

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Jim Thompson

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Robert C Monsen

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CWatters

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Jim Thompson

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Charles W. Johnson Jr.

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Mike Harrison

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Nitro

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