Driver to drive?

[Jim Thompson]

On Mon, 04 May 2009 10:44:10 -0500, flipper <flipper@fish.net> wrote:

On Mon, 4 May 2009 09:56:19 -0500, "marcodbeast" <its@casual.com
wrote:

Eeyore wrote:
Archimedes' Lever wrote:

Jim Thompson wrote:

Success!

See...

http://analog-innovations.com/SED/TROLLFEEDER.jpg

Had to resort to NewsProxy until Agent gets a "References:" filter.

Will now just add, to Agent...

999 Delete: Subject:TROLLFEEDER

Then I won't even see the "TROLLFEEDER" tag.

Someone tell NymNuts, it _is_ universal, presently covering NymNuts,
Eeyore and Slowman follow-ups.

So, as far as I'm concerned, these "folks" don't exist anymore ;-)

...Jim Thompson

JimBob Brainlees Fart's head finally exploded.

It has been quite enjoyable watching him sink deeper and deeper
into his stupidity based seclusion desires.

Have fun being a net recluse. That has to be one of the most
retarded acts ever performed.

I have to agree with you.

The USA claims to be so in favour of 'free speech' yet it's the
Americans here who don't want to hear views that are contrary to
their own.

That's how they retain their cockeyed worldview. The right wing lie
aquariums (Fox, CNS, Newsmax, WND, etc.) their keepers built for them have
one universal feature - they're designed from the bottom up to make them
think that any other info sources, where they might hear actual facts, are
out to get them. There is literally no right wing k00khaus that doesn't
expend quite a bit of effort demonizing what they call the Mainstream Media,
can't have the dupes finding out they are in a fantasy world. =)


Congratulations on the near perfect emulation of a dog barking at his
own reflection.

But "marcodbeast", et al, _do_ provide a constant reason for laughter.

Why can't any of these nutcases understand that Freedom of Speech does
NOT require me to listen? Nor does it protect these whiners from
being offended... or that "offense" is a self-inflicted wound?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Stormy on the East Coast today... due to Bush's failed policies.

 

[James Arthur]

legg wrote:

On Sat, 2 May 2009 17:15:50 -0700 (PDT), Mark-T
MarkTanner50@gmail.com> wrote:

DId anyone here see the problem presented in
the Science section of NY Times last week?
Quite startling, to see something so sophisticated
in a 'general readership' publication.

Is it solvable without a calculus of variations approach?

At least it makes more 'sense' than the duck and the fox.

There's no reason for the duck to leave the pond.

The only problem I see with the elaborate solution is the assumption
that the obviously ill 'killer' rabbit will react in any way to the
presence of suits around the pond's periphery. After all, a rabbit
with any sense wouldn't be in the middle of a pond in the first place.

RL

In real life, the rabbit leaps from the pond and slaughters all
concerned with his "big, nasty teeth," despite Tim the Enchanters'
best efforts to warn them.

Tragic, really.

James Arthur

 

[keithw86@gmail.com]

On May 4, 12:46 am, alertj...@rediffmail.com wrote:

Based on trends in mask and design costs for standard cells, vs. FGPA
capabilities, do
you believe the number of new designs per year executed in standard
cells will increase
or decrease in the future as compared with a baseline of 2007 ?

I think it will increase, what do you think ?

I think you're nuts, but you can ignore history at your peril.

 

[Jan Panteltje]

On a sunny day (Mon, 4 May 2009 08:28:19 -0700 (PDT)) it happened Tim Williams
<tmoranwms@gmail.com> wrote in
<fcb2ca0a-407b-48cd-9a50-67b1890f83b1@z7g2000vbh.googlegroups.com>:

On May 4, 6:52 am, Jan Panteltje <pNaonStpealm...@yahoo.com> wrote:
I have exactly that here, made it for strobe tests.
White LED too, uses an 8 pin PIC, and 2 transistors to get some high curr=
ent.
Want the asm source? Could perhaps still find it.

A PIC for blinking an LED? Not even LED*s*, but *an* LED?

You are scum among engineers!

(Obligatory ;-) included, since *I hope* you chose a PIC for timing
reasons or something.)

Tim

Well, yes, timing reasons and low part count.
Actually I looked up the little board, only one transistor..
and the PIC 12Fsomething.. just put it away again.
Indeed I wanted to see for myself if I could get better brightness from a white LED
with short very high current pulses, then with just DC.
It is not better,
I wanted the pulses to be at about mains frequency, or at least
faster then when you would see flashes.
555 timer could do it, but I have a load of those 12Fsomething PICs, and
no 555s, so why not use the PIC?
In my view the times of analog MVBs is over, big capacitors are more expensive then chips (PICs),
and you need to keep them in stock.
Sure you can do the same with 2 or 3 transistors... But not with the same
stability.

I do not see what people have against PICs, programmable logic, you see
people here make huge complex circuits with 7400 series or even CD400 series,
or whatever, as solutions to some question.
Was it you who did a z80 setup to just display some 7 segment data while
a PIC<-- could do it faster cheaper and better?
Just a few lines of asm in a micro (I am not married to PIC either), will do away with all
but one of the chips usually.
So when you have the assembler, the programmer, the PIC, and the knowledge how to write the code,
why go out an buy something you no longer need?
Even for the simplest thing,

 

[Jan Panteltje]

On a sunny day (Mon, 4 May 2009 08:54:02 -0700 (PDT)) it happened mj
<elucify@gmail.com> wrote in
<80fce343-a875-4050-9a22-6618d7b264fa@s28g2000vbp.googlegroups.com>:

On May 4, 7:52 am, Jan Panteltje <pNaonStpealm...@yahoo.com> wrote:

I have exactly that here, made it for strobe tests.
White LED too, uses an 8 pin PIC, and 2 transistors to get some high curr=
ent.
Want the asm source? Could perhaps still find it.

Actually, it's the circuit to pump current through those LEDs that I
need. My code works already. It works, but the light is feeble. The
asm source wouldn't do me much good, since I'm using AVR. (Now, there,
I'm going to get called scum again!)

But I would love to try out your circuit!

Dank je wel!

--Mark

Hi mark, I looked it up, it is very simple, a BCsomething switches the LED from
12V via a resistor to ground,.
Probably not advanced enough for when you want high efficiency.
The PIC drives the transistor via a base resistor, it was only one transistor I see now.
The PIC gets 5V via a 7805...

Het beste!

 

[Jan Panteltje]

On a sunny day (Mon, 4 May 2009 08:57:05 -0700 (PDT)) it happened mj
<elucify@gmail.com> wrote in
<2d72c583-6321-4879-8c6e-c0993947faf9@g20g2000vba.googlegroups.com>:

14 amps, well now that ought to do it. :{)

Can someone explain to me why a MOSFET would be better here than a
bipolar? Seems I should be getting enough current through the LED with
my 2n2222 darlington arrangement, but my transistor design skills have
always been modest. And when I learned it, MOSFET drivers were still
exotic, believe it or not. We did only bipolars.

MOSFETs (special ones with low gate threshold voltage) interface nicely to
micros without drawing much current from the output pin.
At least for the low speeds that you are using.
MOSFET input capacitance can be as big as a few nF, so at higher speeds
switching get compromised (bad rise and fall times), say above a few kHz
for a pin that can source / sink 10 mA.
C.U = i.t

 

[Bob Eld]

"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:49FE534C.A53AB854@hotmail.com...

In the mean time the Arctic, Greenland and the Antarctic keep melting
and
ice breaking up. Explain that. Me thinks you are "out to lunch."

No, the Arctic ice is recovering, can't say much about the others but
these
things happen normally all the time. Temps go up and down without human
intervention. AGW is treating the planet as if it should be in stasis.

Graham

Wrong! The arctic sea ice recovered slightly from the 2006 minimum but as of
April 2009, it was less in area than 1979-2000 average. Furthermore, the
trend line is a downward slope and the Arctic on average has lost 40% of its
pre 1980 ice. Also, new ice formed is now very thin and is vulnerable to the
present melt season. You delude yourself if you think GW does not exist. The
evidence is clear for anybody with half a brain to observe. See
http://nsidc.org/arcticseaicenews/index.html

Just last week a chunk of ice the size of Manhattan broke of one of the
Antarctic shelves and Greenland is melting at an advanced rate. Because of
the loss of ice the earth's albedo is decreasing causing a positive feedback
effect with increased solar absorption.

 

[Martin Brown]

Don Klipstein wrote:

In article <49fd38eb$0$21120$9a6e19ea@unlimited.newshosting.com>,
RFI-EMI-GUY wrote:

Eeyore wrote:
RFI-EMI-GUY wrote:

(snip)
:Visible infrared?

Maybe I meant "near infrared". Indeed it is red and very warm light.
Presumably the optical pass-band of the PVC.
What I am seeing seems to contradict the PVC spectral absorption curve.
See link:

http://www.infraredheaters.com/page12.htm

The PVC curve shown is only shown for wavelengths longer than 2
micrometers.

What you are seeing is certainly much shorter wavelength, likely not far
from 700 nm (one common definition of boundary between visible and IR).

My experience is that if white light from sunlight or tungsten is turned
to a warm-looking red by a non-red object, what I see is wavelengths
from around 590-600 nm through the low, maybe mid 700's of nm.

If it is bright enough, and the sun is plenty bright some people can see
out almost to 780nm IR. Beyond that you need a CCD camera (they will
easily see the 820nm IR from a TV remote as bright).

Wavelengths out past 700nm are faint and do not necessarily look red so
much as grey but they are detectable by a dark adapted eye in some
individuals. You can sort of cheaply emulate the effect by making a pair
of googles with unexposed black slide film. After your eyes dark adapt
the scene comes back into a false colour view not unlike Kodak IR film.

A CD spectroscope will allow you to reference the wavelength against a
red LED.

NB it is dangerous to look at the sun with an IR long wave pass filter.
The visible light is mostly blocked so with the iris wide open looking
at the sun even for a short time can do real damage. There are no pain
receptors in the eye you don't feel anything until much later.

Regards,
Martin Brown

 

[Joerg]

Jasen Betts wrote:

On 2009-05-03, Joerg <notthisjoergsch@removethispacbell.net> wrote:
RFI-EMI-GUY wrote:
In my house attic, I have several 4 inch white PVC vent stacks which are
simply white PVC drain pipe extending from the wall headers through the
attic and the roof. On the roof, these are covered with lead flashing to
prevent water from getting inside the house. I have been doing a lot of
work in the attic, and have noticed that these pipes "glow" quite
noticeably as a result of the sunlight outside. As this often happens
when the sun is at the horizon and thus at an angle below which direct
coupling into the pipe would be possible, I am very curious as to the
reason that the visible infrared portion is so much more visible than
white light spectrum. Has anyone else noticed this? What is going on?

White PVC sticking out the roof? 4"? Wow. White PVC usually becomes
rotten from UV pretty quickly. If it isn't painted it begins to turn
brown within 2-3 years in our area. After some more years you can
sometimes crumble it by hand.

if it's loaded with TiO it'll last several decades exposed.

Contractors typically use the cheapest stuff they can get. Made in China.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.

 

[John Larkin]

On Tue, 05 May 2009 00:13:51 +1000, Bob Larter <bobbylarter@gmail.com>
wrote:

John Larkin wrote:
On Mon, 04 May 2009 17:47:29 +1000, Bob Larter <bobbylarter@gmail.com
wrote:

Eeyore wrote:
John Larkin wrote:
[...]
Here's the box:

ftp://jjlarkin.lmi.net/99A260A1.JPG

ftp://jjlarkin.lmi.net/99A260A3.JPG

ftp://jjlarkin.lmi.net/99S260A.JPG

Seems to work now.
Ah ! Point to point wiring. The toob nuts would be proud of you.
;~)
Well, that's one way to reduce leakage!

This circuit has only one really leakage-sensitive node, and it's not
on the terminal strip. Its insulation is mostly air. The only leakage
is on the body of the opamp (National claims 10 fA typ) and the
polycarb thing I added to the front panel.

Unfortunately, on the LMC6001 the ni input is pin 3, and pin 4 is -5V.

With the kinds of currents you're measuring, I'd be worrying about skin
oil from your fingers on the chip package, terminals, etc. It might be
worth your while to brush everything down with isopropyl alcohol.

The opamp is as clean as I can get it. With better measurement
technique and zeroing out the offset of the opamp (only about 100 uV)
I'm seeing about 30 fA error now.

Hey, I could slip a few mylar shims under the polycarb insulator, lift
it up a hair, and increase the leakage distance of the middle
terminals to the chassis.

John

 

[Tim Shoppa]

On May 3, 8:23 pm, John Larkin
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:

These crappy RatShack terminal posts are actually conductive!

http://www.radioshack.com/product/index.jsp?productId=2103639

A pair of them leak 12 pA to the chassis at +1 volt. If I ground
myself and hold the plastic screw part of one, it goes up to 20.

So I'll have to replace them with some Pomonas or something. What a
nuisance.

Pity; they do look nice.

Certainly the type of plastic they use seems to have a kinda oily
surface as they come out of the Rat Shack blister packs. Dunno if
that's the binder post plasticizer vapor, or some sorta vapor from the
blister pack, or just the environment in the packaging factory/city.

Tim.

 

[flipper]

On Mon, 04 May 2009 08:53:28 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On Mon, 04 May 2009 10:44:10 -0500, flipper <flipper@fish.net> wrote:

On Mon, 4 May 2009 09:56:19 -0500, "marcodbeast" <its@casual.com
wrote:

Eeyore wrote:
Archimedes' Lever wrote:

Jim Thompson wrote:

Success!

See...

http://analog-innovations.com/SED/TROLLFEEDER.jpg

Had to resort to NewsProxy until Agent gets a "References:" filter.

Will now just add, to Agent...

999 Delete: Subject:TROLLFEEDER

Then I won't even see the "TROLLFEEDER" tag.

Someone tell NymNuts, it _is_ universal, presently covering NymNuts,
Eeyore and Slowman follow-ups.

So, as far as I'm concerned, these "folks" don't exist anymore ;-)

...Jim Thompson

JimBob Brainlees Fart's head finally exploded.

It has been quite enjoyable watching him sink deeper and deeper
into his stupidity based seclusion desires.

Have fun being a net recluse. That has to be one of the most
retarded acts ever performed.

I have to agree with you.

The USA claims to be so in favour of 'free speech' yet it's the
Americans here who don't want to hear views that are contrary to
their own.

That's how they retain their cockeyed worldview. The right wing lie
aquariums (Fox, CNS, Newsmax, WND, etc.) their keepers built for them have
one universal feature - they're designed from the bottom up to make them
think that any other info sources, where they might hear actual facts, are
out to get them. There is literally no right wing k00khaus that doesn't
expend quite a bit of effort demonizing what they call the Mainstream Media,
can't have the dupes finding out they are in a fantasy world. =)


Congratulations on the near perfect emulation of a dog barking at his
own reflection.

But "marcodbeast", et al, _do_ provide a constant reason for laughter.

Yes, and I trust you can tell from the nature of my reply that I dern
near spewed my coffee when I read his post.

Why can't any of these nutcases understand that Freedom of Speech does
NOT require me to listen?

Oh I don't think for a minute that Eeyore doesn't know no one 'has' to
listen. That was just typical 'liberal speak' in blabbering nonsense,
knowing it's nonsense but with total disregard for it being nonsense,
simply for the purpose of denigration (or whatever the goal de jour
is).

I'll give you another example. Now, unless you're a prolific C-Span
watcher you won't have seen this because it's so brain dead I don't
think anyone else on the planet covered the event but you know C-SPAN.
They just turn the cameras on and whatever happens happens.

At any rate, during the 'Social Security Privatization' debate a
gaggle of Congressional Democrats came trotting down the steps to a
press microphone and announced they had 'discovered' the 'hidden
secret' to the President's plan. You see, when you take your up to 3%
out of the SS trust fund and invest it in your 'private' account then
you get the interest from the private account but... but... but...
here's the 'secret' the President won't tell you... you do NOT get
interest from the SS trust fund you took the money out of!!!

My jaw dropped. No kidding? You don't get interest from an account you
don't have the money in? That's the 'secret'? Naw, I couldn't have
heard that right. But, fortunately, each and every one of them got
their turn at the mic telling the same story.

Now, I have to either think each and every one of them are certifiable
idiots, eeehhh could beeee, or that they knew darn good and well
they were babbling nonsense but babbled it anyway because, hey, if it
works....

Nor does it protect these whiners from
being offended... or that "offense" is a self-inflicted wound?

Well, I disagree that all 'offense' is 'self inflicted' but being
'offended' has certainly become an all too convenient excuse.

The world could use a bit more manners and grace.

> ...Jim Thompson

 

[marcodbeast]

flipper wrote:

On Mon, 4 May 2009 09:56:19 -0500, "marcodbeast" <its@casual.com
wrote:

Eeyore wrote:
Archimedes' Lever wrote:

Jim Thompson wrote:

Success!

See...

http://analog-innovations.com/SED/TROLLFEEDER.jpg

Had to resort to NewsProxy until Agent gets a "References:"
filter.

Will now just add, to Agent...

999 Delete: Subject:TROLLFEEDER

Then I won't even see the "TROLLFEEDER" tag.

Someone tell NymNuts, it _is_ universal, presently covering
NymNuts, Eeyore and Slowman follow-ups.

So, as far as I'm concerned, these "folks" don't exist anymore ;-)

...Jim Thompson

JimBob Brainlees Fart's head finally exploded.

It has been quite enjoyable watching him sink deeper and deeper
into his stupidity based seclusion desires.

Have fun being a net recluse. That has to be one of the most
retarded acts ever performed.

I have to agree with you.

The USA claims to be so in favour of 'free speech' yet it's the
Americans here who don't want to hear views that are contrary to
their own.

That's how they retain their cockeyed worldview. The right wing lie
aquariums (Fox, CNS, Newsmax, WND, etc.) their keepers built for
them have one universal feature - they're designed from the bottom
up to make them think that any other info sources, where they might
hear actual facts, are out to get them. There is literally no right
wing k00khaus that doesn't expend quite a bit of effort demonizing
what they call the Mainstream Media, can't have the dupes finding
out they are in a fantasy world. =)


Congratulations on the near perfect emulation of a dog barking at his
own reflection.

....says the serial liar.

 

[marcodbeast]

Jim Thompson wrote:

On Mon, 04 May 2009 10:44:10 -0500, flipper <flipper@fish.net> wrote:

On Mon, 4 May 2009 09:56:19 -0500, "marcodbeast" <its@casual.com
wrote:

Eeyore wrote:
Archimedes' Lever wrote:

Jim Thompson wrote:

Success!

See...

http://analog-innovations.com/SED/TROLLFEEDER.jpg

Had to resort to NewsProxy until Agent gets a "References:"
filter.

Will now just add, to Agent...

999 Delete: Subject:TROLLFEEDER

Then I won't even see the "TROLLFEEDER" tag.

Someone tell NymNuts, it _is_ universal, presently covering
NymNuts, Eeyore and Slowman follow-ups.

So, as far as I'm concerned, these "folks" don't exist anymore
;-)

...Jim Thompson

JimBob Brainlees Fart's head finally exploded.

It has been quite enjoyable watching him sink deeper and deeper
into his stupidity based seclusion desires.

Have fun being a net recluse. That has to be one of the most
retarded acts ever performed.

I have to agree with you.

The USA claims to be so in favour of 'free speech' yet it's the
Americans here who don't want to hear views that are contrary to
their own.

That's how they retain their cockeyed worldview. The right wing
lie aquariums (Fox, CNS, Newsmax, WND, etc.) their keepers built
for them have one universal feature - they're designed from the
bottom up to make them think that any other info sources, where
they might hear actual facts, are out to get them. There is
literally no right wing k00khaus that doesn't expend quite a bit of
effort demonizing what they call the Mainstream Media, can't have
the dupes finding out they are in a fantasy world. =)


Congratulations on the near perfect emulation of a dog barking at his
own reflection.

But "marcodbeast", et al, _do_ provide a constant reason for laughter.

....says the serial liar.

 

[flipper]

On Mon, 4 May 2009 12:09:59 -0500, "marcodbeast" <its@casual.com>
wrote:

flipper wrote:
On Mon, 4 May 2009 09:56:19 -0500, "marcodbeast" <its@casual.com
wrote:

Eeyore wrote:
Archimedes' Lever wrote:

Jim Thompson wrote:

Success!

See...

http://analog-innovations.com/SED/TROLLFEEDER.jpg

Had to resort to NewsProxy until Agent gets a "References:"
filter.

Will now just add, to Agent...

999 Delete: Subject:TROLLFEEDER

Then I won't even see the "TROLLFEEDER" tag.

Someone tell NymNuts, it _is_ universal, presently covering
NymNuts, Eeyore and Slowman follow-ups.

So, as far as I'm concerned, these "folks" don't exist anymore ;-)

...Jim Thompson

JimBob Brainlees Fart's head finally exploded.

It has been quite enjoyable watching him sink deeper and deeper
into his stupidity based seclusion desires.

Have fun being a net recluse. That has to be one of the most
retarded acts ever performed.

I have to agree with you.

The USA claims to be so in favour of 'free speech' yet it's the
Americans here who don't want to hear views that are contrary to
their own.

That's how they retain their cockeyed worldview. The right wing lie
aquariums (Fox, CNS, Newsmax, WND, etc.) their keepers built for
them have one universal feature - they're designed from the bottom
up to make them think that any other info sources, where they might
hear actual facts, are out to get them. There is literally no right
wing k00khaus that doesn't expend quite a bit of effort demonizing
what they call the Mainstream Media, can't have the dupes finding
out they are in a fantasy world. =)


Congratulations on the near perfect emulation of a dog barking at his
own reflection.

...says the serial liar.

mirror bark bark bark bark

 

[Tim Williams]

On May 4, 6:52 am, Jan Panteltje <pNaonStpealm...@yahoo.com> wrote:

I have exactly that here, made it for strobe tests.
White LED too, uses an 8 pin PIC, and 2 transistors to get some high current.
Want the asm source? Could perhaps still find it.

A PIC for blinking an LED? Not even LED*s*, but *an* LED?

You are scum among engineers!

(Obligatory ;-) included, since *I hope* you chose a PIC for timing
reasons or something.)

Tim

 

[Raveninghorde]

On Mon, 4 May 2009 09:21:41 -0700, "Bob Eld" <nsmontassoc@yahoo.com>
wrote:

"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in message
news:49FE534C.A53AB854@hotmail.com...

In the mean time the Arctic, Greenland and the Antarctic keep melting
and
ice breaking up. Explain that. Me thinks you are "out to lunch."

No, the Arctic ice is recovering, can't say much about the others but
these
things happen normally all the time. Temps go up and down without human
intervention. AGW is treating the planet as if it should be in stasis.

Graham

Wrong! The arctic sea ice recovered slightly from the 2006 minimum but as of
April 2009, it was less in area than 1979-2000 average. Furthermore, the
trend line is a downward slope and the Arctic on average has lost 40% of its
pre 1980 ice. Also, new ice formed is now very thin and is vulnerable to the
present melt season. You delude yourself if you think GW does not exist. The
evidence is clear for anybody with half a brain to observe. See
http://nsidc.org/arcticseaicenews/index.html

Just last week a chunk of ice the size of Manhattan broke of one of the
Antarctic shelves and Greenland is melting at an advanced rate. Because of
the loss of ice the earth's albedo is decreasing causing a positive feedback
effect with increased solar absorption.

The antartic ice is above long term trend:

http://arctic.atmos.uiuc.edu/cryosphere/iphone/images/iphone.anomaly.antarctic.png

 

[Tim Williams]

On May 4, 9:56 am, Anon <a...@domain.invalid> wrote:

Some very basic calculus is helpful.  A solution is given at
http://www.mathrec.org/old/2003jul/solutions.html

Riddle:

There is a rabbit in the middle of a perfectly circular pond. An
agent is trying to get the rabbit. The rabbit swims exactly away from
the agent. After a few seconds, the agent's head explodes. Why?



Ya know, if the agent always seeks the closest path (with no
underlying intelligence to escape the following scenario), the rabbit
(if it were more intelligent) could follow a zig-zag path. As soon as
it moves somewhat to the right, the agent sees this and moves in that
direction. The rabbit, noticing the reduced distance, changes
direction immediately. As it crosses the diameter the agent is
standing on, the agent reverses direction. The opposite then happens,
ad nauseum, until the rabbit reaches the shore safely.

Theorem 1: The rabbit can reach the shore regardless of the agent's
relative speed.
Theorem 2: Either the agent's head explodes, or the Church-Turing
Theorem is false.

Theorem 2 follows from taking the limit as delta x approaches zero
(that is, the width of the zig-zag). In the limit, the rabbit appears
to proceed in a straight line, exactly opposite the agent (this also
works if the rabbit simply moves in exactly this path, with no
infinnitessimal shaking). The agent cannot decide which direction to
go, because his distance-o-meter is saying both directions are equal.
In terms of angle, sign(tangent(theta)) is undefined (where sign(x) is
+1 when x > 0, -1 when x < 0, and either 0 at x = 0, although sign(0)
may sometimes defined as +1). So now it's an undecidable problem, and
if the agent somehow succeeds, a lot of theorems (including those
about decidability) are wrong, or the agent's head simply
explodes. ;-)

Tim

 

[Rich Grise]

On Sun, 03 May 2009 22:46:44 -0700, alertjean wrote:

Based on trends in mask and design costs for standard cells, vs. FGPA
capabilities, do
you believe the number of new designs per year executed in standard
cells will increase
or decrease in the future as compared with a baseline of 2007 ?

I think it will increase, what do you think ?

Frankly, I think this sounds suspiciously like a homework question.

Good Luck!
Rich

 

[mj]

On May 4, 11:28 am, Tim Williams <tmoran...@gmail.com> wrote:

On May 4, 6:52 am, Jan Panteltje <pNaonStpealm...@yahoo.com> wrote:

I have exactly that here, made it for strobe tests.
White LED too, uses an 8 pin PIC, and 2 transistors to get some high current.
Want the asm source? Could perhaps still find it.

A PIC for blinking an LED?  Not even LED*s*, but *an* LED?

You are scum among engineers!

(Obligatory ;-) included, since *I hope* you chose a PIC for timing
reasons or something.)

Tim

Hah! Now I must defend my honor! (Though I must admit to being scum in
other contexts.)

Actually, I'm actually doing this for a dozen LEDs at once. A rotating
transparent disk has [A-Z0-9 ] printed just inside the circumference
around the circle. A motor spins the disk at 20-50 RPM (controlled by
the MCU with PWM). An IR photo-Q watches for a black mark on the
bottom of the disk, and through a Schmitt trigger, interrupts the
processor once per rev. The 12 LEDs are arranged radially below the
row of letters flashing by, and since the MCU knows where the disk is
at all times, it can flash to display a specific character at a
specific position. Shifting the character positions lets you scroll a
character at a time, slight delay or advance on the clock gives smooth
scrolling, alternating between one character and another provides
dissolve, etc. Plus another photo-Q will receive text messages from a
tiny IR keyboard (Targus). I may also network-enable it so it can show
RSS feeds.

Kind of like a POV toy, but strobing spinning characters instead of
drawing the characters with finely-spaced LEDs.

Flashing a single LED, indeed! Harrumph!

:{)