Driver to drive?

[Bob Stephens]

On Thu, 21 Oct 2004 07:59:05 -0700, Mark Fergerson wrote:
<snip - o - la>

Including using up precious bandwidth by unnecessarily
quoting a long post...

Mark L. Fergerson

Which of course, you did...

 

[Jim Yanik]

Jonathan Kirwan <jkirwan@easystreet.com> wrote in
news:2sken0pep4njh3dacp9q7igbm8u7a65ieu@4ax.com:

On 20 Oct 2004 18:50:42 GMT, arthurj@aol.comet.net (James Arthur)
wrote:

Jon, the keyword you seek was there, posted just a tad below...

With your new prodding I decided to just search for "1971" and found
it! Thanks!

Searching the transcript for "videotape" will call up the relevant
remarks.

The _3rd_ instance (sorry 'bout that) will take you to the text:
"MEET THE
PRESS, April 18, 1971," where John Kerry's comments are transcribed.


Either this, or perhaps his 6/30/71 debate with John O'Neill:
rtsp://video.c-span.org/project/c04/c04_rwh081504.rm

I don't (and won't) install real-audio/video on my machine here.
This will either have to wait until I can set up a different machine
for this task. If you can put in the text, that would be great, but
I'd understand if that's not
reasonable.

Googling for "kerry cavett debate transcript" yields a number of
useful
sites, the first of which is:

http://ice.he.net/~freepnet/kerry/index.php?topic=KerryONeill

Skimming past Mr. Cavett's introduction, O'Neill begins registering
his
complaints
shortly into his opening remarks.

I can see that things are somewhat clearer here. I also see that the
'modern' Kerry is saying that there was a good deal of anger, and less
accuracy, in words he used earlier. Perhaps understandable, given his
age then and far more limited perspective at the time. And as he
pointed out on the April 18th, 2004 interview (on the exact
anniversary of his 1971 Meet the Press interview, I note), his use of
the exact term "War Criminal" was applied to those who ordered and
signed off on things, more than others. Waffling? Perhaps.

My own feeling about this is that Kerry was obeying orders, as should
anyone unless they are absolutely clear that it violates their oath to
the US to obey it. It's deadly serious to do otherwise. A life or
death kind of thing. The taint of "war crimes" inures more to those
who give such orders, as Kerry noted in his reply. Soldiers in the
field simply don't have the perspective or the authority to change or
disobey orders.

Thanks! Much better case that the earlier posters were able to
muster! I respect your contribution here and it does make a modest
case.

Jon

Funny how people are SO forgiving of such things when it's KERRY,but if it
were Bush,things would be much different.Look at the stuff that's been
pulled about Bush's Reserve service,for example.(CBS and their 'documents')
Where's the outcry about that? Even DemocRATs should be calling for CBS to
fire some of their people.(like Rather)

--
Jim Yanik
jyanik-at-kua.net

 

[Rich Grise]

On Sat, 16 Oct 2004 00:02:01 +0000, Mark Borgerson wrote:

In article <608b6569.0410151444.3088dd5d@posting.google.com>,
larwe@larwe.com says...
IIRC nasa does something like this, with a data stream on a couple of lines
of the video. They float it across the screen, so that it never consistently

It's not really related at all - the OP was talking about putting an
LCD in the field of view, which is very different from replacing video
lines with data lines. The latter method is impossible given my design
constraint - don't modify the camera. It would be impossible to

I agree wholeheartedly with your desire to keep the camcorder intact.
This is as a result of a few attempts to repair VCRs----which are
mechanically much larger. The idea of loosening a screw on the

I think a similar approach would work on an audio recorder---but
probably at a lower baud rate. I used an SX chip from UBICOM as a
modulator/demodulator. For lower baud rates, a PIC would probably
do the job with less power dissipation.

OK, since you put it that way - we're back to "how to put telemetry

on an audio tape." Remember, it's a camcorder, so it might have pretty
good audio response - probably better than 10 KHz. How much telemetry
is there in a sub, for heaven's sakes? How fast are you expecting
stuff to change? Just make an ascii stream and put it through a 9600
BPS modem chip in half-duplex. Do you really need more than 960
characters per second of data?

Thanks,
Rich

 

[Clarence]

"Anders F" <af-spam@hi5.dk> wrote in message
news:2tpa29F22p8f4U1@uni-berlin.de...

"Frank Bemelman" <f.bemelmanx@xs4all.invalid.nl> wrote in message
I'm surprised that one exists. Small package too, 7mm x 4mm. It
looks challenging to get rid of the heat, even at 95% efficiency.

Say 8A @ 30mR (didn't check the actual value) - that's under 2W...
And powerplanes/copper fills are quite effective heat-spreaders (try solder
a plane with a tiny tip ;-)

/Anders

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

The App note shows 16 components external and it is a sole source part.

At least the alternate with external Power switches did not take so many
additional parts and there are other sources for a similar component.

Price comparisons?

 

[Joerg]

Hi Winfield,

So it's fair to say the '2369 transistor is well and thriving nicely.
The production quantities are *massive* -- not a hobbiest-only part!


That looks like the 2369 is still very much alive and kicking. Nice to

see that, it was one of my favorites long time ago before most
everything went to FETs. Now with logic supply voltages trending ever
lower FETs aren't that hot anymore and bipolar becomes more suitable again.

I am still wondering whether there is anything with a baker clamp that
can do higher voltages, like 60V or above. But I guess there isn't and
so the Schottky has to be added externally.

Regards, Joerg

http://www.analogconsultants.com

 

[Nicholas O. Lindan]

Let's start a cascade

 

[Winfield Hill]

Joerg wrote...

I am still wondering whether there is anything with a baker clamp
that can do higher voltages, like 60V or above. But I guess there
isn't and so the Schottky has to be added externally.

Low capacitance Schottky diodes are not common, I like the SD101A,
which is 2.2pF at 0V, and 1.0pF at 15V reverse voltage, not too bad.
But it's only rated for 60V total.


--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)

 

[Rene Tschaggelar]

Fox zhou wrote:

I need a 100MHz or 1GHz high accurate clock as the time base. I hope
it is a one chip solution with low jitter (<10ps). Who knows this kind
of product? Please tell me. Thank you.

This single chip can only be a quartz oscillator.
There are 100MHz Xtal osc available.
10ps rms jitter should be no problem for a quartz based oscillator.
You need -80dBc/rtHz@10Hz, -100dBc/rtHz@1kHz.. -100dBc/rtHz@100kHz

For something else, it is almost unreachable.

In case you'd allow a Quartz plus some other chip there may be more
choices, such as PLL multipliers and so.

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

 

[ChrisGibboGibson]

Hello again Joerg

If you provide some LC, just a little, maybe you don't need a picosecond.

LC at that power level? Think about the size.

Refer to the above and show me one at reasonable cost that will pass 1000
amps
with less voltage drop than the mosfet body diodes for long enough to blow
the
fuse.


It's been too long ago that I used big Schottkys. One was I believe from
Ixys' DSS series. A monster of a diode that came in a flat pack and
needed to be bolted down. I think it was 400A and had two diodes. But it
may be too expensive here.

But think about that. It's not even *close* to being big enough.

How much current would a diode have to pass connected directly across a large
battery bank with a 1000 amp slow blow fuse in line in order for the voltage
across the diode never to reach more than say 0.4 volts? Not even for a pico
second. 10,000 amps? 20,000 amps?

I don't know if this can be done: A crowbar solution around the LTC4412
power path controller?

Controlling what? Another bank of mosfets 4 times the size of the one already
in the inverter?

The challenge would be to supply it fast enough
though and that alone might rule it out in an inverter.

I don't believe it would be possible to control it fast enough. It would have
to go forwards in time in order to do so

Ok, how about this low-tech solution: A sizeable automotive relay. Wrong
polarity - no turn on. It could even light an LED, telling the user that
it would be nice to swap the leads A few hundred amps over a relay is no
big deal and they aren't even that voluminous. It should beat the
Schottky in terms of cost.

Yeah that's been done. ASP in Sweden used that solution. Problem is the no load
current draw of the inverter goes from 0.1 amps in idle mode to 0.7 amps.
Messes up the marketing.

The best solution I saw was a large fuse link inside the inverter in the
battery feed that wasn't fitted. It was hidden inside the polystyrene packing.
Hidden in the middle of the text of the owners manual was a note about this
link. Until you read the manual, you didn't know about it and the inverter did
nothing.

But in this case there is very large inductance between the IGBTs and the
output port which thereby slows the voltage rise time as seen by the IGBTs
when
it is backfed.

That isn't the case in a modified sinewave inverter so no matter *how* fast
you
make the sense circuit, the overcurrent on the IGBTs is instant. They blow
at
the same time as the overcurrent circuit senses the problem.


But a little inductance should not cost that much since this is the low
current side. Then again in modified sinewave every penny counts.

It also makes a mess of the output waveform slowing the rise time and giving
overshoot.

Well, I try to treat it with the same respect as my car. I don't throw
that into 2nd gear either when doing 65mph.

I think you're over estimating the intelligence of the average inverter user

Try a *variable speed* electric drill on it. Don't come asking me to help
when
it blows up


Actually, I did run a variable speed Milwaukee Sawzall for quite some
time on a mod-sine unit. I held my breath for the first few seconds but
I had no choice. The only problem was that the overload tripped whenever
I pushed too hard on the blade because the inverter wasn't quite rated
for that big saw.

You were lucky, unless it was a line frequency unit. They're usually ok.

It will remain so as long as customers in general buy the cheap ones. When
they
finally realise that the expensive ones *are* better the prices will fall
even
faster than they already are doing.


The two sides have to meet somewhere in the middle. Then there needs to
be some education in the advertising material, plus other publicity.
That's how Honda or Toyota got to command a much higher price for a
sedan than some other brands. People realized that you do get what you
pay for, that there are no free lunches.

Yeah one day the same might happen in the inverter market.

Gibbo

 

[John Popelish]

rob wrote:

Thanks Guys....we are doing some solar air heating work and would like
to monitor 9 spots...on the cheap.....my idea is to make 8 sensors and
run wires to spot where temperature display unit is located....either
have wires run to switch or hook up manually one by one when readings
are taken....My understanding (limited) is that I can run thermistors
to a volt meter and temps can be calculated from resitance...is this
correct....we would like to eventually log them with a computer but
that is down the road a bit...thanks again.

Rob

You have the right idea. The limitations using DC (immune to the
capacitance of the cable) are that the current that produces the
voltage drop across the thermistor must not heat the thermistor enough
to matter and must not drop enough voltage along the wire to matter.
Thermistors with a room temperature resistance of something like 10k
ohms make the wiring resistance pretty insignificant, and as long as
you pass a fraction of a milliamp through them do not have much self
heating. So if you can come up with a 100 microamp meter movement,
you can make a fair thermometer with only a voltage regulated supply
and some resistors and a multi pole selector switch. You will have to
make a custom meter face that indicates temperature on a nonlinear
scale. Later, a multiplexer and an A/D converter can connect the
thermistors to a computer.



--
John Popelish

 

[Winfield Hill]

Joerg wrote...

Hi Winfield,

Low capacitance Schottky diodes are not common, I like the SD101A,
which is 2.2pF at 0V, and 1.0pF at 15V reverse voltage, not too bad.
But it's only rated for 60V total.

Then there is the MMSD701T1 which is around 0.5pF and goes to 70V.

Ah, yes, very nice. And also the mmbd701 types.

The problem arises when you need more than 70V where it's usually
back to Schottky rectifiers.

Well, those are Schottky diodes... What were you meaning to say?

Capacitance is not such a concern in switchers but recovery time
goes up a lot. Also, they only come in large footprint. Cost is
another matter. A nickel may not be so bad but it is sometimes
too much for use in a baker clamp situation.

--
Thanks,
- Win

(email: use hill_at_rowland-dotties-org for now)

 

[Joerg]

Hi Winfield,

The problem arises when you need more than 70V where it's usually
back to Schottky rectifiers.



Well, those are Schottky diodes... What were you meaning to say?


Yes, they are also Schottky diodes. It's just that manufacturers refer

to the big ones as rectifiers where they often don't spec capacitance.
Somehow there seems to be a gap in what is offered. Either you can
obtain the small fast ones in the 70V or less range, or you can buy the
100V plus types in the big SMT packages which are usually rated at one
amp or higher. There isn't much available if you want small footprint
and higher voltages. I guess there just is no market for them.

So if you want to do a baker clamp in a 100V switcher application this
may no be possible since the package for the diode might be almost as
big as the inductor. That much real estate often isn't in the cards.

Regards, Joerg

http://www.analogconsultants.com

 

[Spehro Pefhany]

On Thu, 21 Oct 2004 18:45:30 GMT, the renowned Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Hi Spehro,

Hot air. You can even use a $25 heat gun from Home Despot, though a
$100 electronically-controlled one is better and requires less skill.


Where do you get those $100 versions? Or did you mean the big ones,
similar in size to the $25 Home Depot heater?

The professional stuff from Weller and Metcal starts well above $500.

Yes, similar to the cheap ones but more sophisticated. Here's some
different kinds, made by Steinel (there are probably cheaper ones,
especially with the sad state of the US dollar at the moment, but I
know Steinel is good). Made for a much broader market:

http://www.howardelectronics.com/steinel/steinelhotairguns.html

No problem unsoldering a PQFP-80, should it find itself soldered in at
90/180/270 degree rotation..


That situation usually invokes some rather strong words. The kind that
is caught by the beep chips on TV. I have also seen engineers on the
verge of a tantrum, especially if some buried traces became open.

"Mistakes were made", move on, rinse but do not repeat. ;-) So long
as it isn't intentional- like that so-and-so we had that deliberately
wrecked stuff to get laid off after the minimum for unemployment had
passed. That makes me mad.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

 

[Joerg]

Hi Spehro,

Yes, similar to the cheap ones but more sophisticated. Here's some
different kinds, made by Steinel (there are probably cheaper ones,
especially with the sad state of the US dollar at the moment, but I
know Steinel is good). Made for a much broader market:

http://www.howardelectronics.com/steinel/steinelhotairguns.html


Those are the big ones. Now I wish they made some kind of flexible hose

accessory where you can insert small nozzles for IC work. That would
relieve us from the high prices of the pro stations at least for the
occasional solder/unsolder job.

"Mistakes were made", move on, rinse but do not repeat. ;-) So long
as it isn't intentional- like that so-and-so we had that deliberately
wrecked stuff to get laid off after the minimum for unemployment had
passed. That makes me mad.


Wow, I have never had that experience. I guess that guy doesn't even

realize how toast his career will be after that.

Regards, Joerg

http://www.analogconsultants.com

 

[normanstrong]

Fred Bloggs <nospam@nospam.com> wrote in message
news:<416E92E2.60807@nospam.com>...
Bush has made several characteristics of his leadership style
clear: 1)
he refuses to acknowledge reality, 2) he refuses to acknowledge
that he
made *any* mistakes whatsoever.

All that means is that Bush is a politician. Politicians never
"acknowledge mistakes" until they're out of office and writing their
memoirs. The best you can hope for is "the challenge has changed and
therefore our response must change to meet it." This is the way
politicians acknowledge mistakes.

Norm

 

[Terry Given]

Joerg wrote:

Hi Spehro,

Yes, similar to the cheap ones but more sophisticated. Here's some
different kinds, made by Steinel (there are probably cheaper ones,
especially with the sad state of the US dollar at the moment, but I
know Steinel is good). Made for a much broader market:
http://www.howardelectronics.com/steinel/steinelhotairguns.html


Those are the big ones. Now I wish they made some kind of flexible hose
accessory where you can insert small nozzles for IC work. That would
relieve us from the high prices of the pro stations at least for the
occasional solder/unsolder job.

"Mistakes were made", move on, rinse but do not repeat. ;-) So long
as it isn't intentional- like that so-and-so we had that deliberately
wrecked stuff to get laid off after the minimum for unemployment had
passed. That makes me mad.

Wow, I have never had that experience. I guess that guy doesn't even
realize how toast his career will be after that.

Regards, Joerg

http://www.analogconsultants.com

would it? in the litigious states, does anyone dare breath a
non-positive word about an ex-employee?

we once had a guy show up for an interview who seemed quite good. we
checked his references, and they lauded him. We then noticed he had
worked (about 2 years back) for a guy we knew, but didnt list him as a
reference. So we rang the guy, who vehemently warned us against hiring
the guy, whom he referred to as a "dangerous, bungling fool." Turns out
the glowing reference from his current employer was a ruse to get rid of
him.

I too have seen sabotage at work, building large ac drives. It all
started after a christmas departmental lunch. R&D had a 3-hr lunch
break, and came back half-pissed. marketing went to lunch at 11:30 and
never came back. The big drives assembly line (they invited the prod mgr
but he wouldnt come) took 1.5hrs not the 1hr they were allocated, so the
prod mgr told the supervisor Freddie he was going to dock everyone
0.5hrs pay. Freddie basically said "im responsible, dock me" so the prod
mgr DID! almost 2 days pay. what an asshole! Next day at work and for
the following week, our fail-on-test rate skyrocketed - half a dozen big
drives (200kW+) dead in one week, whereas we normally had < 1 per month.

in the next mgmt meeting our R&D mgr blamed the prod mgr for the
failures - the workers are directly responsible for the products
reliability, so dont piss them off.

do you think the prod mgr learned his lesson? nope. Next year, R&D took
1/2 days annual leave for our dept lunch - this went a long way to
healing the (inevitable) rift between production & R&D staff.

Cheers
Terry


it was also interesting that we could tell when new staff were added -
big drives invariably started blowing up.

 

[Rich Grise]

On Thu, 21 Oct 2004 21:46:43 +0000, Jonathan Kirwan wrote:

huge difference between someone who uses their born with a silver spoon
in mouth position (which, no matter what you try and say to me, I am
fairly certain he *did* use it) to take privileges that few of us are
able to afford and ... Kerry. I felt it was also very wrong for the
rich in the Civil War to be able to buy their way out by paying someone
else to take their place, as well.

This brings up a thought - did the slaves do anything during that war?
If a southern slave-owner ordered his slaves to go fight for the
Confederacy in his place, would that be a dilemma? Did (m)any of them run
away or just turn collaborator and fight for the Union?

I wonder about weird stuff. ;-)

Thanks,
Rich

 

[Fred Bloggs]

Tom Seim wrote:

It's been that way for some time now.

And you have been a liar for all of your life- that's an even longer time.

Compare that to the libs demand that
DeLay resign as Majority Leader because of an "admonishment" by the
ethics committee.

Not quite true-criminal investigations are being pursued. The Majority
Leader is supposed to set an example- even an admonishment is too much
of a bad example- he should go.

Then take the case of Trent Lott, who made the fatal
sin of praising a man who had been a racist, Strom Thurmond. No
apology by Lott could placate the libs, who smelled blood in the
water. Only a resignation would do. And the bastards got it!

That's because he went a little bit further than praise Thurmond- he
said something along the lines of America being a better place if
Thurmond's racial agenda had gone through. Lott got what he deserved,
and it was not just a Democrat thing- even Bush disowned him after that.
Hehe.

Libs are not bothered in the least by an obvious, blatant lack of
balance in their statements and positions. This is the way it is, get
used to it because it ain't gonna change.

And you don't seem to let little things like *facts* get in the way of
your bullshit. Do ya' now, fatarse?

 

Try this place: http://www.phaselink.com/results.asp?terms=pll502

On 21 Oct 2004 08:40:14 -0700, fox@pub.xaonline.com (Fox zhou) wrote:

I need a 100MHz or 1GHz high accurate clock as the time base. I hope
it is a one chip solution with low jitter (<10ps). Who knows this kind
of product? Please tell me. Thank you.

 

[Guy Macon]

Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> says...

"Mistakes were made", move on, rinse but do not repeat. ;-) So long
as it isn't intentional- like that so-and-so we had that deliberately
wrecked stuff to get laid off after the minimum for unemployment had
passed. That makes me mad.

I read about a fellow who decided to do that, but instead of damaging
something important he kicked in the locked door to the executives-only
washroom and vandalized it.

When I worked at Perkin-Elmer, some Pointy-Haired-Boss told the folks
building the new plant to put "the most expensive fixtures available"
in the executive WC. Thet did; stainless steel mirrors, stainless
steel toilets with no lid, TP dispensers built like a battleship,
teflon stall doors/partitions, Tile walls/floor/ceiling, etc.

It looked like a prison.