Driver to drive?

[Clifford Heath]

Since a car can build up static electricity, it must have a
fairly high impedance to ground. Thus if it is fitted with an
positive ion emitter (like the ion generators for home and office
use, but for +ve ions), it would build up a -ve charge from the
excess electrons. This is the stated operating principle of the
auto anti-corrosion devices, which have been pretty controversial.

I don't see why they shouldn't work. Can anyone come up with a
strong argument either way?

Clifford.

 

[Genome]

"Genome" <ilike_spam@yahoo.co.uk> wrote in message
news:H5ttd.1$g4.0@newsfe4-win.ntli.net...

IN THE MEANTIME

I'd just like to point out that a CUK converter doesn't suffer a transport
delay and it doesn't suffer from a right half plane zero.

Ken Smith and ChrisGibboGibson are blowing it out of their collective
Assholes.

DNA

Oh, Larry Brasfield is blowing big chunks as well.

DNA

 

[Richard H.]

Jim Thompson wrote:

I understand there's also a "tester" which forces
shunts to close when they didn't when the bulb
failed. Anyone know about where to obtain and how
well it works?

Sounds clever. I haven't seen that, but this one works 100% of the
time. Home Depot sells them.

http://www.amazon.com/exec/obidos/tg/detail/-/B00004WLKP/

It's dead simple - wand it over the dark bulbs to find the last one with
live AC. That's the dead one.

Pre-wired trees are a little harder to trace the string, but it still
works great.

Cheers,
Richard

 

[Richard H.]

"Nicholas O. Lindan" wrote:

Great product design: If the customer is too cheap
to buy a box of replacement bulbs he gets to buy a
whole new string ...

Except... a whole new string is cheaper than replacement bulbs!

 

[Genome]

"Ken Smith" <kensmith@green.rahul.net> wrote in message
news:cp5t5v$2pd$1@blue.rahul.net...

In article <H5ttd.1$g4.0@newsfe4-win.ntli.net>,
Genome <ilike_spam@yahoo.co.uk> wrote:
[...]
IN THE MEANTIME

I'd just like to point out that a CUK converter doesn't suffer a
transport
delay and it doesn't suffer from a right half plane zero.

Yes it does have transport delay as I said including the qualifier about
how you are doing the PWM control[1]. Since you have demonstated that you
don't know that much, I'll let others decide if your word can be trusted
about the RHP zero.

[1] go read my post elsewhere in this thread.

--
--
kensmith@rahul.net forging knowledge

OK Ken, it's a CUK..... not a SEPIC.

I know it's a CUK because he said it was a CUK and a CUK doesn't suffer from
a transport delay or a right half plane zero. Fair enough, a SEPIC does, but
this is a CUK, not a SEPIC.

DNA

 

[Ken Smith]

In article <H5ttd.1$g4.0@newsfe4-win.ntli.net>,
Genome <ilike_spam@yahoo.co.uk> wrote:
[...]

IN THE MEANTIME

I'd just like to point out that a CUK converter doesn't suffer a transport
delay and it doesn't suffer from a right half plane zero.

Yes it does have transport delay as I said including the qualifier about
how you are doing the PWM control[1]. Since you have demonstated that you
don't know that much, I'll let others decide if your word can be trusted
about the RHP zero.

[1] go read my post elsewhere in this thread.

--
--
kensmith@rahul.net forging knowledge

 

[Yzordderrex]

Seems I've gotten a lot of milage out of this post.

I don't think it has a RHP zero either. Just a bunch of poles in
about the same place which drives the transfer function bonkers. Looks
like this model has got some Q as well - some peaky gain where all the
poles are. Gain then drops like a rock. I'll agree the way to get
this thing to behave is to stick another pole in front of the rest of
em and drive the gain/bandwidth down early. I would inviite my
professor here to offer his take on it, but somebody might offend him.
This used to be such a polite place to visit. Heheh.

Meanwhile I will study for final and perhaps spend a few more hours in
the analytical mode here with master Cuk. If I develope a thesis I
will be sure to post.

thanks all
Bob


regards,
Bob

 

[Don Pearce]

On Tue, 07 Dec 2004 20:57:57 -0500, Mike Monett <no@spam.com> wrote:

Ian Stirling wrote:

John B?ckstrand <newsmdhmajs.100.sandos@spamgorumet.com> wrote:

Not very convincing. The streak is constant density all the way across
- looks digitally added to me.

NASA prankster? Not likely, imho. There are literally tons of possible
_natural_ explanations for this one. The small flash looks alot like
something produced in the lens, but the streak I have no good
explanation for. An insect flying by the camera would likely explain
this though, someone on slashdot said the EXIF says flash was fired
(why? No idea), so the flash combined with a insect zooming by would
explain it, however the streak is much too straight to really look like
the path of a flying insect. The flash could probably kill small insects
that are too close to it, Ive scarred plastic stuff by holding them
infront of the flash, on the other hand the flas seems to be fired in
the lowest position.

There are lots of other possible causes: blowing bulb, shadow from a
jetstreak (both?) or a actually, why not a meteor?
(some snipped, exif data)

Tag |Value

Manufacturer |Canon
Model |Canon PowerShot G3
Exposure Time |1/19 sec.
Aperture |f/5.6
Exposure Bias |0.0
MaxApertureValue |73/32
Metering Mode |Pattern
Flash |Flash fired, auto mode, red-eye reduction mode.
Focal Length |9.1 mm

Ok, so the shutter is open quite a long time.
1/19th second.

Apature I make as about 2mm.

At the shutter speed of 1/19th of a second, the flash is
quite adequate to freeze motion.

I'm assuming that the camera fires the flash first.

Just to the right of the streetlight, and extending up and down, I
see a ligher area that seems to have two "arms" pointinf up-right and
down-left.
This seems to continue over the light, being washed out by it,
coming to an end just after the light.

It's interesting that approximately normal to the 'arms', and in
line with the extended blob centered over the light is the rest
of the streaks path.

Let's assume it's an insect.
It was happily flying past (climbing, or descending if the flash
fires last) when the flash went off as it started to bring
its wings down, and the flashes light ended with the wings in
the down position.

I make the angular size of the main bright spot (call it the body)
18 pixels across or so.
This is about 1/100th of the picture size, which I make at about
.1r.
So, call it a milliradian.
So, the 'true' size might be half a milliradian, or if the insect
is 1mm across (apature 2mm) maybe a meter away.

Say the streak crosses a third of the picture, so that's .03r/.19s,
or .15r/s, or (if a meter away) 15cm/s.

Not an extreme speed for an insect.

Apature is 2mm, so assuming that it's well inside focal distance,
and the size is 2mm (the blur is not very sharp edged),

Very good!. Sounds quite convincing. You might post your analysis in the
APOD forum at

http://bb.nightskylive.net/asterisk/viewtopic.php?t=249

Best Wishes,

Mike Monett

Come on chaps. Just look at my recreation of the effect at
http://www.donepearce.plus.com/odds/strange_pryde_big_again.jpg and
you will see how easily this was done.

d

Pearce Consulting
http://www.pearce.uk.com

 

Kevin Aylward wrote:

And you seriously suggest I am not aware of all the main shortcomings
of
real devices? Your a joke and a troll dude.

You need to re-read your basics, boy.
And who you callin' a troll, Troll?


Slick

 

[Active8]

I'll repeat this in this thread where it's easier to find:

Are you aware of the fact that this is just Dr. Slick (check the
headers) f*cking with you?

--
Best Regards,
Mike

 

[Paul Burke]

unoriginal_username@yahoo.com wrote:

Hi,

I am trying to make a fan using a stepper motor where the radius of the
rotor is very large, say, 1 meter, and the drive is applied at the
periphery of the fan (the fan will have a rim at the outer
circumference).

I want super high rotational speed. The faster the better. Natuarlly
the atmospheric drag will increase with the rotational velocity, but I
was hoping that I could simply increase the speed by increasing the
power delivered.

You increase the speed of a stepper by increasing the step frequency. It
will have a huge angular momentum, so don't try to accelerate quickly.
But why a stepper motor? Surely you don't need to control the
instantaneous position of a fan? I would have thought a linear induction
motor operating on an aluminium band round the rim would have been a lot
easier.

Paul Burke

 

[Pooh Bear]

Martin Riddle wrote:

Looks like a knat flew in front of the lens.

You mean a gnat ?

Graham

 

[Kevin Aylward]

Active8 wrote:

I'll repeat this in this thread where it's easier to find:

Are you aware of the fact that this is just Dr. Slick (check the
headers) f*cking with you?

Well, I am now

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

 

[Active8]

On Wed, 08 Dec 2004 09:57:44 GMT, Kevin Aylward wrote:

Active8 wrote:
I'll repeat this in this thread where it's easier to find:

Are you aware of the fact that this is just Dr. Slick (check the
headers) f*cking with you?

Well, I am now

So how's that 500W MOSFET amp coming along?

--
Best Regards,
Mike

 

[John Woodgate]

I read in sci.electronics.design that Pooh Bear <rabbitsfriendsandrelati
ons@hotmail.com> wrote (in <41B6C851.C5268514@hotmail.com&gt about
'Strange Streak in Australia', on Wed, 8 Dec 2004:

Martin Riddle wrote:

Looks like a knat flew in front of the lens.

You mean a gnat ?

Graham

A gnat is a million times larger than a knat.

--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk

 

At that time, European cars had positive earth battery systems.

So did many US cars/tractors/trucks up until the 1950's.
Not to mention 6V and 8V electrical systems.

Tim.

 

[Terry Pinnell]

John Woodgate <jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Pooh Bear <rabbitsfriendsandrelati
ons@hotmail.com> wrote (in <41B6C851.C5268514@hotmail.com&gt about
'Strange Streak in Australia', on Wed, 8 Dec 2004:


Martin Riddle wrote:

Looks like a knat flew in front of the lens.

You mean a gnat ?

Graham

A gnat is a million times larger than a knat.

Lyric revision?
'I'm a gnu, how do you do.
'I'm a knat, how about that?'

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Winfield Hill]

Kevin Aylward wrote...

I'm just too aware now of how short our lives are. I dont think that
many actually *really* stand back and *feel* the emotion resulting
from "there will be a time when I no longer exist".

What's the benefit from doing that?


--
Thanks,
- Win

 

[Yzordderrex]

Yes, I think the pole zero pole might be best. I'll give it a try and
see.

thanks again everybody.

regards
Bob

 

[Anders F]

"Mike Monett" <no@spam.com> wrote in message news:41B60C07.1F02@spam.com...

Here's a puzzle. If anyone can solve it, you guys can.

Astronomy Picture of the Day (APOD) has an unusual picture taken just
after a gray streak apparently hit a streetlamp, causing a flash and
some smoke. Investigation showed damage to the housing and the lamp had
failed. Photos taken before and after the flash do not show the gray
streak. The more you study it, the stranger it becomes. Here's the url:

http://antwrp.gsfc.nasa.gov/apod/ap041207.html

Whoops, guess my new plama ray gun do actually bounce off the atmosphere...
But I swear: I /was/ shooting at the little blue men in their space ship ;-)

/Anders (I'm with Don on his theory (all the way) ;-)