magnetic field

[Wim Lewis]

In article <98bf1ac8.0410201358.67d02eb7@posting.google.com>,
Michael Bails <bailsybro@gmail.com> wrote:

Hello Group,

Could someone please advise me on creating a spice3 output file
(through the unix format) which prints a given output with no spaces
or page breaks.

I haven't tried it, but the options "nobreak" or "nopage" sound like they
do what you're asking for.

Alternatively, you could run the output file through something to remove
the page-breaks, e.g. fgrep -v, sed, or tr.

--
Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1

 

[kay & wand]

anyone got a link to these leds?

leslie

 

[Bernd Felsche]

chump@pobox.com (Chump) writes:

I'm looking to make a steering angle sensor for my data acquisition
system in my race car. I basically need to translate the movement of
the steering wheel into voltage read by the logger unit.

The logger provides a 5v reference signal so I figured I could send
that signal through a potentiometer then back to the unit.

most commerical units available ($$$) use a system of pulleys driven
off of the movement of the steering shaft itself.

some questions -

what type of pot would be good for this application. I understand
audio ones are not linear enough?

You could linearise with a microcontroller; if the potentiometer
has _repeatable_ non-linearity.

Anyone have any idea where I can get different sized pulleys to go on
the end of the pot?

any other tips advice or different ways of doing it?

Optical or reluctance encoding off the steering shaft.

You could also do it "indirectly" by measuring the linear
translation of the steering rack, with potentiometer, linear encoder
using optical, potentiometer, inductive, or capacititative
measurement.
--
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
\ / ASCII ribbon campaign | I'm a .signature virus!
X against HTML mail | Copy me into your ~/.signature
/ \ and postings | to help me spread!

 

[Richard Crowley]

"Daniel Kelly (AKA Jack)" wrote ...

I recently saw an advert for some LED lights for filmmaking. They looked
perfect - very efficient, flicker-free, dimable from 0-100% etc. The
problem is that they're extortionately priced. So now I want to make my
own
LED lights for use on film...

Has anyone tried this?

From news:alt.binaries.schematics.electronic....

"Jeff" wrote ...
While on the subject, where's the best current place to buy bright,
white LED's?

"Watson A.Name - wrote ...

http://www.whitelightled.com a dollar apiece and postage. Just a
satisfied customer, bought a few hundred from him.

 

[BEVERNON]

Another quick question.

Are you interested in the steering wheel angle or the angular displacement of
the wheels on the ground?
Brad

 

[Gerard Bok]

On 22 Oct 2004 19:04:34 -0700, chump@pobox.com (Chump) wrote:

I'm looking to make a steering angle sensor for my data acquisition
system in my race car. I basically need to translate the movement of
the steering wheel into voltage read by the logger unit.

The logger provides a 5v reference signal so I figured I could send
that signal through a potentiometer then back to the unit.

Wouldn't go that way. Potmeters are just not suitable for neither
the job nor the environment.

Other options:
- Magnet on the steering wheel axis and some hall sensors.
- Slit disk mounted / coupled to the steering wheel and 2 optical
detectors.

any other tips advice or different ways of doing it?

Drive carefully

--
Kind regards,
Gerard Bok

 

[Tony Morgan]

In message <10nkqu21d3hag05@corp.supernews.com>, Richard Crowley
<rcrowley7@xprt.net> writes

Just recieved in email from Video Systems Newswire... (Additional
online content at:
http://videosystems.com/mag/video_litepanels_lighting_kits/)

Snipped....

Very interesting - thanks for that Richard.
--
Tony Morgan
http://www.camcord.info

 

[CWatters]

"Al" <no.spam@wanted.com> wrote in message
news:no.spam-F1A561.10410023102004@news.verizon.net...

In article <edb4ee52.0410221804.26461908@posting.google.com>,
chump@pobox.com (Chump) wrote:


Try this. Print out a strip of paper with alternating black bars on it.
It should be long enough to fit around your shaft. You need two sets of
bars which are shifted by 90 deg from each other.

or just strap a mouse to it.

 

[BEVERNON]

Subject: Re: Steering angle sensor
From: "CWatters" colin.watters@pandoraBOX.be
Date: 10/23/04 1:11 PM Eastern Daylight Time
Message-id: <Rgwed.287712$E63.14665790@phobos.telenet-ops.be


"Al" <no.spam@wanted.com> wrote in message
news:no.spam-F1A561.10410023102004@news.verizon.net...
In article <edb4ee52.0410221804.26461908@posting.google.com>,
chump@pobox.com (Chump) wrote:


Try this. Print out a strip of paper with alternating black bars on it.
It should be long enough to fit around your shaft. You need two sets of
bars which are shifted by 90 deg from each other.

or just strap a mouse to it.

LOL..... don't let the ASPCA find out about that.
Brad

 

[Norm Dresner]

"Clarence" <no@No.com> wrote in message
news:yrxcd.31711$QJ3.26469@newssvr21.news.prodigy.com...

"Jean T?r?metz" <jean.teremetz@free.fr> wrote in message
news:8216c56.0410170757.22cd5644@posting.google.com...


What the hell is this, Its not readable nor of any value when translated.

Oh, it's "readable". It looks like pure "crap", but it's readable
enough.

Norm

 

[Ken]

On 24 Oct 2004 23:55:35 -0700, adidaxjigx@yahoo.com (Jig Wong) wrote:

Which is the future of television: crt, plasma,
lcd, rear projection, front projection?

I know that the new plasma and LCD screen's aren't exactly built
to last like the old CRT tubes, yet they are way more costly.
What do you think is going to be the TV of the future?

I think one of this: Plasma, LCD or OLED.

 

[Nicholas O. Lindan]

"Jig Wong" <adidaxjigx@yahoo.com> wrote

What do you think is going to be the TV of the future?

Silence is golden ... So is a blank bit of wall.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com

 

[Nicholas O. Lindan]

"Chump" <chump@pobox.com> wrote

I'm looking to make a steering angle sensor for my data acquisition
system in my race car. I basically need to translate the movement of
the steering wheel into voltage read by the logger unit.
The logger provides a 5v reference signal so I figured I could send
that signal through a potentiometer then back to the unit.

If the data logger has an analog input this may be the easiest way.

There are special potentiometers for just this purpose. They are normally
1-turn units (300 degrees or so) and that will set the requirements for
the pulley/belt/gearing. A standard 10-turn pot will also work,
though they are not made for this application. Search the Newark or
Arrow electronics sites.

Most potentiometers are linear. Non linear ones are used for volume
controls on radios and such.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

 

[CWatters]

"Roy Szweda" <szweda@gmail.com> wrote in message
news:64249a23.0410191255.672f6d37@posting.google.com...

This is the kind of technical explanation I was hoping for - I have
been using various Walkmen type gadgets such as a neat MP3/Wav/VCD
player I got from EBay which has its own batteries which you can
recharge in situ...

Do you know what technology they are? It usually has it marked on there
somewhere.

when I put other cells in such as alkaline MN1500s

Some data if you are interested..
http://www.duracell.com/oem/primary/alkaline/alkefftemp.asp

they don't last as long it seems

Alkaline cells have a higher voltage than most rechargables so if you see
reduced run time with those it isn't a voltage issue.

nor do the other rechargeables I have used OK with other portables etc.

So I wondered if the
electronics in the Walkman was overly sensitive... It is always
amazing that they can make these things work at all at a measly 3 V!

Ha!

http://www.electronicstalk.com/news/nat/nat241.html
"National Semiconductor has developed a Boomer stereo headphone amplifier
designed to operate from a one-cell battery".

I'll leave you to work out how to protect the amplifier from a battery
inserted backwards. Hint: Can you afford to loose 0.7V by adding a diode

 

[petrus bitbyter]

"Goran" <goransd@yahoo.com> schreef in bericht
news:b9f17f5b.0410260928.141e2522@posting.google.com...

I am taking a portable massager (you know, the ones that look similar
to hair dryers and with different attachments) from USA to Europe.
Now, it vibrates AND heats. The manual states it uses 10W. What kind
of voltage converter should I get? The one for heating (ebay is full
of those '1600W') or the one for electronics (ebay: usually '50W')?

You do not mind voltage and frequency. Voltage is the most important because
if a 120V appliance is connected to a 220V mains it will be fried very
quickly. But connecting a 60Hz appliance to 50Hz mains can be fatal as well.
Inductances in the massager will saturate every 10ms which explains both
vibration and heating. So the converter you need will have to convert both
voltage and frequency. Even then, you canot be sure of good adaption. A lot
of adapters, especially cheaper ones, do not deliver pure sine wave but
blocks or so called modified sine wave. Maybe your massager does not have a
problem with that but you can't be sure unless you've tried. As for the
power, 50W will be good enough for a 10W appliance. But even then the
covertor may be more expensive then a new massager.

petrus bitbyter


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.778 / Virus Database: 525 - Release Date: 15-10-2004

 

[tango4]

For curiousity sake.... how much do these commercial units go for? Why?

Lots - several thousand dollars to 10's of K ( Formula 1 style )

Small market. Heavy environment.

How linear is linear enough? What are the design requirements for data
accuracy? How often is the data sampled?

There are lots of ways to do this that don't involve pulleys (dark ages?)

Regards,
Brad

 

[John Fields]

On 22 Oct 2004 19:04:34 -0700, chump@pobox.com (Chump) wrote:

I'm looking to make a steering angle sensor for my data acquisition
system in my race car. I basically need to translate the movement of
the steering wheel into voltage read by the logger unit.

The logger provides a 5v reference signal so I figured I could send
that signal through a potentiometer then back to the unit.

most commerical units available ($$$) use a system of pulleys driven
off of the movement of the steering shaft itself.

some questions -

what type of pot would be good for this application. I understand
audio ones are not linear enough?

Anyone have any idea where I can get different sized pulleys to go on
the end of the pot?

any other tips advice or different ways of doing it?

---
You might want to consider a cable pot.

--
John Fields

 

[John Larkin]

On 28 Oct 2004 15:34:27 -0700, alanh_27@yahoo.com (Alan Horowitz)
wrote:

Is there a place in modern technique for regeneration (Q-multiplication)?

Rarely, if ever. Gain and selectivity are cheap nowadays, and
regeneration trades them for stability.

John

 

[Joerg]

Hi John,

Is there a place in modern technique for regeneration (Q-multiplication)?



Rarely, if ever. Gain and selectivity are cheap nowadays, and
regeneration trades them for stability.


So after trying to mimick tube amps via algorithms the next big thing

would be the emulation of a Q multiplier on a DSP

Regards, Joerg

http://www.analogconsultants.com

 

[Guillaume Soro]

"Alan Horowitz" <alanh_27@yahoo.com> wrote in message
news:1e3670a7.0410281434.70887cc7@posting.google.com...

Is there a place in modern technique for regeneration (Q-multiplication)?

Yes, there are some kits available to build, seen them somewhere on the net.
There is also quenched regen. which works better than just regeneration.
Regen has the best sensitivity, but poor selectivity
It was popular in the first radios 1910 to 1925, then the superhets came
in, with better stability, but cost more.