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server
Guest

Wed Sep 29, 2004 4:25 pm   



message unavailable

Jamie
Guest

Wed Sep 29, 2004 4:25 pm   



look at PIC chips.
www.microchip.com
they have very small 8 pin types that would be
more than enough for that.
you need a programmer from them to write the
code in it.. its not hard to do and its fun to
learn, after you see what can be done with these
programmable integrated chips you will wonder why
you never looked there before!


Berrie wrote:
Quote:
Dear Reader,

I'm looking for information (quotation for production quantity's)
for a little chip in a toy.

The only thing that this chip has to do is pick a RANDOM number (10th of a
second) between 1 and 24 seconds and then change the direction of a
motor.

eg; 1.4 seconds to the left
3.1 seconds to the right
12.4 seconds to the left
8.3 seconds to the right

etc...etc..

Any help in this matter would be greatly appreciated.

Thanks!

Berrie


gswork
Guest

Wed Sep 29, 2004 4:25 pm   



"Howard Chu" <XYZ.hyc_at_highlandsun.com> wrote in message news:<n4yKa.22139$Fy6.7947_at_sccrnsc03>...
Quote:
"CBFalconer" <cbfalconer_at_yahoo.com> wrote in message
news:3EFA6D18.CCC720D8_at_yahoo.com...
Arrogance doesn't help. Sometime a quiet suggestion does.

Positive knowledge may often be taken for arrogance.

Sad but true. People who don't know better often assert "this is open to
interpretation" about points that are cut-and-dry facts. When faced with
someone who *does* know better, they respond with "how arrogant" when they
themselves are simply being aggressively ignorant.

Reminds me of a time 7 years ago, talking to the DJ at a friend's wedding.
We were talking about music by the Chieftains, and he was pronouncing the
first syllable as in "chef" (sh-schwa sound) instead of as in "chief"
(ch-long e). He was going on and on about how he loves the "chef-tens" and I
finally said "you know, it's pronounced 'Chieftains'."

-- Howard Chu

Chief Architect, Symas Corp. Director, Highland Sun

^^^ Chef Architect ?

Only Kidding! ;)

Quote:

http://www.symas.com http://highlandsun.com/hyc

Symas: Premier OpenSource Development and Support


Richard Heathfield
Guest

Wed Sep 29, 2004 4:25 pm   



Paul Burke wrote:
Quote:

Howard Chu wrote:
it's pronounced 'Chieftains'." He answered "well,
I've heard it pronounced both ways." Since I had just performed with them a
few months earlier I said "They pronounce it 'Chieftains' - I know, I've
played with them."

Well I don't think that's arrogant, it's highly impressive! How many
others in this group play Irish music to any standard?

I play Irish music to an appalling standard.

Quote:
What do you play?

Guitar, keyboards, both well enough to convince a non-musician that I
can play, and both badly enough to convince a musician that I can't.

I'm better at guitar than at keyboards, I guess, which is why I often
tell the computer to play the keyboards on my behalf.

Quote:
I play flute and a bit of pipes, but the best name I can drop is that
I played with Cathal McConnel at a festival many years ago! (Oh, and I
vaguely knew old Des Donnelly- Dezi's uncle- before he died)

Hmmm. I once danced with Maddy Prior at a Steeleye Span concert. Does
that count? :-)

--
Richard Heathfield : binary_at_eton.powernet.co.uk
"Usenet is a strange place." - Dennis M Ritchie, 29 July 1999.
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html
K&R answers, C books, etc: http://users.powernet.co.uk/eton

Howard Chu
Guest

Wed Sep 29, 2004 4:25 pm   



"Richard Heathfield" <binary_at_eton.powernet.co.uk> wrote in message
news:3EFB3FB9.A8A7A081_at_eton.powernet.co.uk...
Quote:
Paul Burke wrote:

Well I don't think that's arrogant, it's highly impressive! How many
others in this group play Irish music to any standard?

I play Irish music to an appalling standard.

Lol... I didn't know there *was* a standard...

Quote:
What do you play?

Fiddle mostly, some mandolin, anything else tuned the same... I've wandered
all over Ireland but I focus on Donegal repertoire.

Quote:
Guitar, keyboards, both well enough to convince a non-musician that I
can play, and both badly enough to convince a musician that I can't.

I'm better at guitar than at keyboards, I guess, which is why I often
tell the computer to play the keyboards on my behalf.

Heh. Cheap trick. Though I've been thinking of getting a Zeta MIDI-fiddle
for a while.

Quote:
I play flute and a bit of pipes, but the best name I can drop is that
I played with Cathal McConnel at a festival many years ago! (Oh, and I
vaguely knew old Des Donnelly- Dezi's uncle- before he died)

Hmmm. I once danced with Maddy Prior at a Steeleye Span concert. Does
that count? Smile

If we're talking festivals and jam sessions, the list gets pretty long. Get
to the Willie Clancy Festival in Clare and you can run into anyone/everyone.
I met and played with Bobby Casey, PJ Hayes, & Junior Crehan there, as well
as taking a workshop with Martin Hayes. I also first ran into Altan there,
at the Crosses of Annagh pub one night. Was just jamming with Alasdair
Fraser last week at a concert here in LA. (Yes, I like Scottish fiddle too.
Scottish strathspeys and Donegal highlands are the ultimate, as far as I'm
concerned...)

And just to tie this into "computing's lost allure" - I used to spend all my
spare time hacking on computers, until I discovered the fiddle. The one
certainly pales in comparison to the other.
-- Howard Chu http://www.highlandsun.com

Roger Johansson
Guest

Wed Sep 29, 2004 4:25 pm   



"Howard Chu" <XYZ.hyc_at_highlandsun.com> wrote:

Quote:
I've also
had to work with people who are faced with an issue and say "I don't know
enough to decide either way." I then tell them "I *know* this is how we
should do it" and they repeat "I don't feel strongly either way." What they
*should* do at that point is just say "OK" and shut up, we've already
established that they are unqualified to make any kind of assertion. But
these people are too clueless to even understand how clueless they are, and
too ignorant to recognize real knowledge and facts when they're confronted
with them.

The problem is in our culture. People are trained to never let anybody
influence their minds, they will fight to the death for their own
opinion, even if they don't have any.
They are taught by the social environment as teenagers to never listen
to advice or accept anybodies arguments, they see other people as
enemies of their state of mind.

The only thing they have respect for is violence.

--
Roger J.

Bill Sloman
Guest

Wed Sep 29, 2004 4:25 pm   



Roger Johansson <no-email_at_home.se> wrote in message news:<d01tfv0t71fpa1mjqvltq3rce0d6n7ohqa_at_4ax.com>...
Quote:
"Howard Chu" <XYZ.hyc_at_highlandsun.com> wrote:

I've also
had to work with people who are faced with an issue and say "I don't know
enough to decide either way." I then tell them "I *know* this is how we
should do it" and they repeat "I don't feel strongly either way." What they
*should* do at that point is just say "OK" and shut up, we've already
established that they are unqualified to make any kind of assertion. But
these people are too clueless to even understand how clueless they are, and
too ignorant to recognize real knowledge and facts when they're confronted
with them.

The problem is in our culture. People are trained to never let anybody
influence their minds, they will fight to the death for their own
opinion, even if they don't have any.
They are taught by the social environment as teenagers to never listen
to advice or accept anybodies arguments, they see other people as
enemies of their state of mind.

The only thing they have respect for is violence.

Don't be silly. Any place I've worked, trying to influence anybody's
opinion by violence would get you instantly fired. I've never seen it
happen, but I have heard a few stories.

What does get their attention, after the disaster, is comments of the
form "This was predicted some time ago, on this basis. Now that we
have verified the negative half of the prediction, can we get on and
try and verify the positive half?"

-------
Bill Sloman, Nijmegen

Spehro Pefhany
Guest

Wed Sep 29, 2004 4:25 pm   



On 29 Jun 2003 10:07:41 -0700, the renowned bill.sloman_at_ieee.org (Bill
Sloman) wrote:

Quote:
Don't be silly. Any place I've worked, trying to influence anybody's
opinion by violence would get you instantly fired. I've never seen it
happen, but I have heard a few stories.

One of my classmates in Uni worked in a brick factory one summer. He
did something on machine A, while other old unionized workers did
other stuff downline. If he worked too fast, resulting in too much
work for the downline workers, they would lob bricks at his head. He
soon got the message to slow down and take it easy. ;-)

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

Don Kelly
Guest

Wed Sep 29, 2004 4:25 pm   



"Kevin Aylward" <kevin_at_anasoft.co.uk> wrote in message
news:Zu9Ma.9$eG4.1318_at_newsfep2-gui.server.ntli.net...
Quote:
Don Kelly wrote:
"Kevin Aylward" <kevin_at_anasoft.co.uk> wrote in message
news:yCQLa.20$oB5.15_at_newsfep3-gui.server.ntli.net...
Don Kelly wrote:
It is not semantics

It is in this example.

you are simply measuring the voltage between two
points- what the cause of this voltage is not determined from this
measurement alone.
You are reading the voltage across the coil which has both
resistance and inductance and is Ri +Ldi/dt -

In principle this is correct, but imo, this small issue, is not what
the poster is asking about.

If the resistance of the coil is small (as is often the case), then
you essentially see Ldi/dt which is the "counter-emf" produced. This
will be true for any excitation waveform, not just sinusoidal.

That is, you now agree, that the "counter-emf" is indeed essentially
the same as the voltage across the inductor.


I see no disagreement in my statements.

Er... I stated from the outset "In principle this is correct"
------

Yes you did. I had no problem with that.
------------
Quote:

There is no indication of the
relative resistance of the coil and any series resistance of the R-L
circuit and nothing to indicate whether Ri or Ldi/dt is dominant so I
initially noted that, as the coil has its own resistance, the coil
voltage will also reflect this.
That is why I chose to give the general voltage across the coil and
then to qualify it for negligable coil resistance.


When a novice talks about an inductor, I usually assume that they are
talking about an ideal inductor. That is they are trying to understand
the basic principles. The most basic of principles is e=-Ldi/dt.
Resistance is a second order effect.

I have re-read the original text, and I still believe that introducing
the coil resistance was not really that relevant to what wanted. e.g. a
simple R/C circuit. Of course, this is just a matter of opinion, so
we'll leave it at that.


Kevin Aylward
salesEXTRACT_at_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.

--------

No problem- . I recognise your points and cannot disagree with them. My
approach is tempered by my background which is mainly low frequency stuff
where resistance is not necessarily negligable.
--
Don Kelly
dhky_at_peeshaw.ca
remove the urine to answer

Precious Pup
Guest

Wed Sep 29, 2004 4:25 pm   



Terry Pinnell wrote:
Quote:

Precious Pup <barking_at_wrongtree.org> wrote:

[snip earlier material]

If you really want simple (low parts), here's a very simple one off the top-o-my-head that might work if you
can get the time constants properly aligned:


+---------R5--+
| |
| +V +V | +V
| | | | |
+V | R3 C3 | R4
| | | | | |
| | +---+ +--+----O Vo
R1 | | | |
| | Q1c | Q2c
+-C1-+--Q1b +---Q2b
| | Q1e Q2e
O R2 | |
/ | GND GND
/ GND
0
|
GND

Some top-o-my-head notes:

[] R5 is insufficient to latch Q1; it simply helps snap the circuit once the threshold has been reached.
Could be either touchy or not yield much.
[] Vo won't quite reach +V due to R5.
[] R2*C1 >> R3*C3, R2 >> R1, R2*C1 roughly sets the pulse width
[] R3*C3 is the noise filter (can it be good enough?). Waving the hands, I'd say the two time constants would
need to be separated by factors on the order of 100 to 1000.
[] power dissipation through R1? Not a low NC power design.

Thanks. I probably didn't get the component values right, as you can
see at
http://www.terrypin.dial.pipex.com/Images/NCSwitchPrecious1.gif
but I couldn't get this working.

I'm not surprised (not your fault). Just stick with what works, even if it's a bit more complicated. Nice
work again.

Levi Kudrna
Guest

Wed Sep 29, 2004 4:25 pm   



"grahamk" <g.knott_at_ntlworld.com> wrote in message
news:KWaMa.667$nP.463_at_newsfep4-winn.server.ntli.net...
Quote:


Have a look at
Beginners and Intermediate Electronics
http://homepage.ntlworld.com/g.knott/index26.htm

"Chris" <imustberich7_at_wmconnect.com> wrote in message
news:122c716d.0306301624.7a4b5cb3_at_posting.google.com...
I am a beginner in basic electronics. I've just done my first 555
timer project with electrnics learning lab. I couldn't understand very
well how the 555 timer worked. I have just followed the book to put
the 555 timer project together. I am also looking for a freeware
professional electronics calculator to download online that can
calcuate from ohm's law all the way down to binary numbers. I also
need to find out as much info about the 555 timer as possible.


The 555 timer can be wired in several different ways to do a variety of

things.

LK

Tom Biasi
Guest

Wed Sep 29, 2004 4:25 pm   



"Chesucat" <chesucat_at_freeshell.org> wrote in message
news:Pine.NEB.4.33.0306302248280.5970-100000_at_norge.freeshell.org...
Quote:
On Mon, 30 Jun 2003, Tom Biasi wrote:

Hi,
The circuit that you provided is a fun little circuit. It will do what
it
says it will do. Don't expect narrow band and range though, it wasn't
designed for that. By the time you modify that circuit you can make a
new
design based on a chip. The range and specs are FCC controlled so pay
attention
Regards,
Tom

edit> F**k the FCC! Long lived Pacifica!;-)

Do that if you like, but she has sharp teeth. As far as I know Pacifica and

all sister stations are FCC legal.
Tom

DarkMatter
Guest

Wed Sep 29, 2004 4:25 pm   



On Sun, 29 Jun 2003 05:53:08 GMT, "Lord Garth" <LGarth_at_tantalus.com>
Gave us:

Quote:

"DarkMatter" <DarkMatter_at_thebarattheendoftheuniverse.org> wrote in message
news:dt1sfvkqnlljugrk6rdrojq6965otfeh5g_at_4ax.com...
Hey guys, I have generated and posted the ultimate axial resistor
decoding guide over in alt.binaries.pictures.misc

If you want a good page to laminate a few of for your students or
yourselves, this is better than any I was able to find on the net.

In fact, it is a compilation of information I found while looking
for a good one. I used the format that was used in at least one of
the guides I did find on the net, but it is still all original art,
done on Quark.

Enjoy!

Why not post it on alt.binaries.schematics.electronic?



There is now an updated version posted. It is a little better. :-]

AC/DCdude17
Guest

Wed Sep 29, 2004 4:25 pm   



X-No-Archive: Yes

John Jardine wrote:

Quote:
Traditionally, in industry, 'power factor correction' has been the unique
preserve of the power factor correction *capacitor*. Industrial plant and
equipment and even large office blocks invariably have a naturally less than
100% power utilisation factor because of too many -inductive- loads, such as
large plant motors or the huge numbers of 'chokes' used in flourescent
lighting fittings. The solution has always been to locally (after the leccy
meter!), switch in and out (manually or automatically) banks of large, mains
rated capacitors running in shunt with the incoming supply voltage. (whole
rooms full of 'em) in an effort to trim the electrical load to look 100%
'resistive'. Switch too many capacitors in and the power usage factor starts
falling off again but in the other direction.

Parallel connected capacitor can compensate for lagging power factor by applying
leading current to it. It's only effective in cos theta correction.

Quote:
In a product such as a switched mode power supply (or even a Triac
controlled dimmer), it also has a 'power utilisation factor' but this is not
caused by inductance, nor is it caused by capacitance, it is just the same
0-100% value that says how efficiently the available power is being used by
the power supply and is simply related to the duty cycle of the on/off power
switching devices.

It is caused by a high crest factor(ratio of peak current vs RMS current).
Anything that depends on rectifier and bulk storage capacitor suffers from this
problem.

The problem is caused by the way capacitor operates. When you use a large
capacitor with a bridge rec. on AC 120V line, the capacitor will charge to
171V DC, which is the peak votlage of sinusoidal 120V AC. Except when the AC
waveform is at the peak, the load depends on capacitor charge to operate. The
charge depletes as the AC voltage sways from the peak. If you let it drop to
165V, the capacitor will not start charging until mains voltage goes up to
165V. At 165V, it abrubtly loads the mains and charges up from there to peak.



Quote:
In these cases it just happens that an inductor and a
carefully controlled fast 'switch' is the best found electronic means to try
and obtain the wanted 100% operating efficiency.

This method is called boost rectifier active power factor correction and works
well for fixed and dynamic loads.

You can also use calculated series inductors on input side to correct power
factor with a fixed load. The property of inductor slows down the current rise,
lowers the harmonic distortions and increases power factor.

It is more reliable than active PFC, but the effectiveness isn't as well, it's
heavy and buzzes somewhat.

http://jeremyc17.tripod.com/ball.html

Scroll down a bit. What you see above the duplex outlet is the power factor
correction inductor used in a two 40W lamp electronic ballast. The
inductor(actually there are two coils on one core) alone weighs 3/4 lbs


Quote:
It is a clever, design
technique only and could also be implemented in other ways, such as
switching capacitors or mixtures of caps and L's.
regards
john


AC/DCdude17
Guest

Wed Sep 29, 2004 4:25 pm   



X-No-Archive: Yes

John Jardine wrote:

Quote:
We still have the load taking 100watts and we still have 42watts of waste
heat being generated and the electricity company as sure as death and taxes
will still be billing you for consuming 142watts.
BUT ... That 50% power usage figure (0.5 power factor), means that the power
supply is taking its power in (1/.5) X 142watts=284watts gulps,

0.5 power factor doesn't necessarily mean 50% duty cycle and it is incorrect to
put 284W in your equation.

It is 284VA (Vrms x Irms=VA), 142W

power factor=real power (W) over apparent power(VA). In the olden days when
power factor was a sole fuction of phase shift, power factor equaled cosine of
degrees of shift in phase between V and I.



Quote:
Who cares? about this power factor thing. one asks. The 50%PF power unit
works equally as well as the >95% one and I'm still only being charged for
the correct 142watts, the same applies no matter what the PF is!.

Residential customers are not penalized for low power factor. Commercial and
industrial customers are assessed a low power factor penalty by the utility
company if the average power factor over the billing cycle is below a set limit.

Quote:
One proud PC owner = Not many problems.
Lots of PC owners = Laws need to be made.


Electronic ballasts are just like any other switching power supplies, but they
must have a power factor >0.95 and THD <20% to be code compliant for use in
commercial and industrial buildings. Unfortunately for the power company,
there's no such legislation for computer power supplies.

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