Chip with simple program for Toy

[John Fields]

On Thu, 25 Oct 2007 15:48:26 -0400, Bill S. <NoSpam@OnMe.com> wrote:

In article <omn1i3ls0e1colgb3t029to85fvinug13t@4ax.com>,
jfields@austininstruments.com says...
Tantalum capacitors are also electrolytic.

That is true.

Other tantalum constructions exist

---
Really? As far as I've been able to find out the only types of
capacitors that use tantalum in their construction are electrolytic.
Am I missing something?
---

as well as electrolytics other than aluminum,

---
Well, there _are_ EDLC's and aerogel capacitors:

http://en.wikipedia.org/wiki/Electrolytic_capacitor#Variants
---

but I didn't feel the need to nit-pick,
rather contented myself to common usage within the apparent
scope of the OP's question...

---
Interestingly, the OP never brought up capacitor construction and,
unfortunately, _not_ nit-picking common usage such as: "Are they
tantalums or are they electrolytics?" helps to propagate the
erroneous belief that tantalum capacitors aren't electrolytic, as
supported by your statement that: "32 Volts is getting a bit out of
the wheelhouse for tantalum, so electrolytic is probably a fair
choice."


--
JF

 

[Daniel Mandic]

Jamie wrote:

Hats off to you sir!

Graham

Sir!

Maybe that's so with you, where one clepes sir to the other, and he
pulls out the sh.. from you and pulls it in his face.

We say Sir here...



Best regards,

Daniel Mandic

 

[Jamie]

Daniel Mandic wrote:

Jamie wrote:


Hats off to you sir!


Graham



Sir!

Maybe that's so with you, where one clepes sir to the other, and he
pulls out the sh.. from you and pulls it in his face.

We say Sir here...



Best regards,

Daniel Mandic
Hmm, Not sure how to interpret that

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[Daniel Mandic]

Jamie wrote:

Well, it's better to be pissed off than pissed on!
Or, Maybe you like that kinky stuff?

hello?

--

 

[Daniel Mandic]

Jamie wrote:

Hmm, Not sure how to interpret that

Private Paula! )))

I didn't know you can staple shit so high.

--

 

[Jamie]

Daniel Mandic wrote:

Jamie wrote:


Hmm, Not sure how to interpret that


Private Paula! )))

I didn't know you can staple shit so high.

You really should examine the translation.



--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[Lord Garth]

"terryS" <tsanford@nf.sympatico.ca> wrote in message
news:1194473345.881600.92210@i38g2000prf.googlegroups.com...
On Nov 3, 3:36 pm, Rich Grise <r...@example.net> wrote:

On Fri, 02 Nov 2007 19:02:41 +0100, Qweertz wrote:

my teammates and I need to develop some device on one of our collage

^^^^^^^

courses.

Would this be for electromechanical placement of the appliqués? ;-)

Good Luck!
Rich

This is a technical subject! No need to be able to spell!
That will come later when it is necessary to make presentations to
management groups and investors?


Apparently, properly formed interrogatives are also low on your list!
Is your last sentence a statement or a question?

 

[Ken Fowler]

On 7-Nov-2007, francesco.messineo@gmail.com wrote:

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From: francesco.messineo@gmail.com
Newsgroups: sci.electronics.basics,sci.electronics.repair
Subject: Re: troubleshooting method for micro-controller board ?
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On 7 Nov, 20:40, "robb" <s...@where.on.net> wrote:
...

i am a bit perturbed by this event and am not looking forward to
removing all ICs and then i have to worry with ROMs too

although i am an amateur i understand your point. but, i do not
realize the significance due to my lack of experience

so 73 Ohms is not a short where 0 Ohms would be
but my amateur question would be... is 73 Ohms good value between
5V and 0v reference ? i had presumed not good


As someone else pointed out, 73 ohms at 5V means a static draw of 5/73
= (about) 68 mA, which for a digital circuit sounds reasonable imho.
It is definitely not a short. What's the fuse rating on the 5V rail?

Regards
Francesco

Careful. He didn't say 73 ohms at 5V. If the 73 ohms is a DVM
measurement, it was probably made with a low voltage applied. When the
circuit is powered up with 5 V, other parts of the ICs are turned on and
the current may be much more than 68 mA. The best use of the ohmeter
measurement is to compare it to a good board. And yes, 73 ohms sounds low
to me.
Ken Fowler

 

On Nov 12, 1:12 pm, rebratted <surej...@gmail.com> wrote:

I think this is a good ebook site. You can search for any ebook title.

http://dl.mazudi.com

worth to try

 

[Jim Thompson]

On Wed, 14 Nov 2007 11:30:45 -0500, "Tam/WB2TT"
<t-tammaru@c0mca$t.net> wrote:

"karthikbalaguru" <karthikbalaguru79@gmail.com> wrote in message
news:1195041202.932226.122340@z24g2000prh.googlegroups.com...
Hi,

Why is WR (Write) active low and RD(Read) is high ?

Thx in advans,
Karthik Balaguru

Never seen that, except as in R/W*.

Tam

It's been a long time since I've designed an HD controller chip but,

IIRC, some chips had separate Read and Writebar capability, but with
the most common use as tied together.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

 

[ian field]

<francesco.messineo@gmail.com> wrote in message
news:93c88014-5860-4492-8dd3-19290c5d3a0c@n20g2000hsh.googlegroups.com...

I'm reading this thread with some interest, but I'm more puzzled as it
goes on, there should be something we are (and the OP is) missing.

AIUI the OP is trying to find which/how many 5V rail devices on a heavily
populated logic board are S/C after a short between 36V & 5V feeds.

A slightly risky strategy would be to use the 5V O/P from an old (pre-3.3V)
AT PSU, which typically can supply 200A or more via progressively lower
current limiting resistors, at some point the current will be high enough to
distinctly heat any S/C components enabling rapid identification, obvious
pitfalls are S/C Unobtainable Logic Arrays, firmware ROMs the supplier
refuse to sell as spares, the risk of blowing circuit traces (unrepairable
in multi-layer boards) and the risk to eyesight from exploding S/C
capacitors!

 

[RP]

On Nov 17, 4:55 pm, "Green Xenon [Radium]" <gluceg...@excite.com>
wrote:

Hi:

Southern magnetic energy is emitted from the side of a magnet taking in
the lines of force. Northern magnetic energy is emitted from the side of
the magnet giving out the lines of force. This is analogous to the fact
that negative electrodes give out electrons and positive electrodes take
in electrons in a circuit. The current flows from negative to positive
because electrons are negatively-charged. Similarly, the south side of a
magnet is positive while the north side is negative.

Regards,

Radium

Magnetic lines of force are only a conceptual tool. There is nothing
moving along those lines. The forces are actually directed
perpendicular to those lines, which makes them not lines of force at
all, they are just imaginary lines that serve as angular references.
The allow determination of the direction that the force will act on a
charge moving relative to the magnet. A simple cubical grid (Cartesian
coordinate system) could serve the same purpose, but the math would be
a bit more complicated.

 

[Eeyore]

"Green Xenon [Radium]" wrote:

Hi:

Southern magnetic energy is emitted from the side of a magnet taking in
the lines of force. Northern magnetic energy is emitted from the side of
the magnet giving out the lines of force.

Magnetic 'lines of force' are notional and are most certainly NOT energy.

Go back to school. You're not competent to post in these groups.

Graham

 

[Green Xenon [Radium]]

Eeyore wrote:

Magnetic 'lines of force' are notional and are most certainly NOT energy.

Why are the lines always depicted as pointing from north to south?

 

[Dan Bloomquist]

RP wrote:

" <gluceg...@excite.com
wrote:
Hi:

Southern magnetic energy is emitted from the side of a magnet taking in
the lines of force. Northern magnetic energy is emitted from the side of
the magnet giving out the lines of force. This is analogous to the fact
that negative electrodes give out electrons and positive electrodes take
in electrons in a circuit. The current flows from negative to positive
because electrons are negatively-charged. Similarly, the south side of a
magnet is positive while the north side is negative.

Regards,

Radium

Magnetic lines of force are only a conceptual tool. There is nothing
moving along those lines. The forces are actually directed
perpendicular to those lines, which makes them not lines of force at
all, they are just imaginary lines that serve as angular references.
The allow determination of the direction that the force will act on a
charge moving relative to the magnet. A simple cubical grid (Cartesian
coordinate system) could serve the same purpose, but the math would be
a bit more complicated.

When I first started on sci.physics I thought the magnetic field was
real. 'The Feynman Lectures' and 'Introduction to Electrodynamics' were
recommended concerning this aspect of physics. It can all be explained*
with the relativistic motion of charge. What turns out to be a very
simple concept once you get the stuff into your head. From what I've
heard, why we don't call it 'electromagnetics' anymore.

Once I ditched my 'cult cargo', physics became so much more interesting
and mysterious.

*There is still the Aharonov-Bohm effect, which I have yet to understand
properly. But the 'B' field does not necessarily come into play other
than mathematically, FWIU.

 

[Jamie]

Eeyore wrote:
As he was looking in the mirror one morning.

Go back to school. You're not competent to post in these groups.

Graham

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[Jamie]

Green Xenon [Radium] wrote:

Eeyore wrote:


Magnetic 'lines of force' are notional and are most certainly NOT energy.



Why are the lines always depicted as pointing from north to south?
Its a reference.

Same thing as the old Left and right hand rule..

Got to start some where.!

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

 

[Eeyore]

"Green Xenon [Radium]" wrote:

Eeyore wrote:

Magnetic 'lines of force' are notional and are most certainly NOT energy.

Why are the lines always depicted as pointing from north to south?

It's merely a convention as it is with the 'direction' of conventional current
flow.

You can find ALL this stuff in BASIC books on electromagnetism, which I suggest
you study. Alos, if you have BASIC questions then post them in BASIC groups.

Graham

 

[Autymn D. C.]

On Nov 17, 6:41 pm, Dan Bloomquist <publi...@lakeweb.com> wrote:

*There is still the Aharonov-Bohm effect, which I have yet to understand
properly. But the 'B' field does not necessarily come into play other
than mathematically, FWIU.

http://google.com/groups?q=Autymn+AB-effect

 

[RP]

On Nov 17, 8:41 pm, Dan Bloomquist <publi...@lakeweb.com> wrote:

RP wrote:
On Nov 17, 4:55 pm, "Green Xenon [Radium]" <gluceg...@excite.com
wrote:
Hi:

Southern magnetic energy is emitted from the side of a magnet taking in
the lines of force. Northern magnetic energy is emitted from the side of
the magnet giving out the lines of force. This is analogous to the fact
that negative electrodes give out electrons and positive electrodes take
in electrons in a circuit. The current flows from negative to positive
because electrons are negatively-charged. Similarly, the south side of a
magnet is positive while the north side is negative.

Regards,

Radium

Magnetic lines of force are only a conceptual tool. There is nothing
moving along those lines. The forces are actually directed
perpendicular to those lines, which makes them not lines of force at
all, they are just imaginary lines that serve as angular references.
The allow determination of the direction that the force will act on a
charge moving relative to the magnet. A simple cubical grid (Cartesian
coordinate system) could serve the same purpose, but the math would be
a bit more complicated.

When I first started on sci.physics I thought the magnetic field was
real. 'The Feynman Lectures' and 'Introduction to Electrodynamics' were
recommended concerning this aspect of physics. It can all be explained*
with the relativistic motion of charge. What turns out to be a very
simple concept once you get the stuff into your head. From what I've
heard, why we don't call it 'electromagnetics' anymore.

Once I ditched my 'cult cargo', physics became so much more interesting
and mysterious.

*There is still the Aharonov-Bohm effect, which I have yet to understand
properly. But the 'B' field does not necessarily come into play other
than mathematically, FWIU.- Hide quoted text -

- Show quoted text -

The Aharonov-Bohm effect is easily explained in the context of
Weberian electrodynamics. The field outside of an ideal solenoid is
not nulled by superpostion of the fields of the current elements ds
around the loop. The law of Biot-Savart is simply incorrect. By
reducing the solenoid to current elements "ds", and then further
breaking these down into positive and negative components of charge
and then integrating over the components of charge in the elements,
the symmetry assumed by Maxwell simply isn't there. The positive
charges remain stationary while the negative charges are drifting
along the conductor. This motion of the electrons wrt an external
point charge in itself produces an "effective" increase in the Coulomb
charge of the drifting electrons. (see Purcell for essentially the
same model that Weber published, but disregard his equal and opposite
flow of positve charges, or in other words Maxwell's assumed
symmetry).

The increase in the effective charge of the drifting electrons is
velocity dependent, rising to maximum when the external charge is
moving counter to the flow that is occuring at the near side of the
coil. The electrons drifting along the opposite side of the coil do
not cancel this force because these electrons are also moving wrt the
point charge, thus they appear to have a greater Coulomb charge as
well. The coil appears to be net negative wrt an external charge,
regardless of the motion of the external charge, but the magnitude of
the effective increase in Coulomb charge is dependent upon the
direction of motion of the external charge and upon its speed, i.e. it
is a velocity dependent effect which gives rise to an illusion that a
magnetic field is acting outside of the solenoid when in fact the
field isn't a magnetic field. It is instead a velocity dependent E
field. The protons also extend a velocity dependent E field, but due
to the assymetry in the relative motions its contribution is less and
due to the geometry of the
relativistic force produced by this component of charge cancels out
leaving an apparent net negative charge of the solenoid as a whole.

By placing a solenoid between the two slits of a diffraction grating
the phase of the passing electron is shifted simply because the
rotational sense of the drifting electrons within the coil are not
symetric wrt the slits. The force will be greater on the electron as
it passes through the slit in which the drifting electrons closer to
it are moving counter to the motion of the electron passing through
the slit. The force on the passing electron will be less through the
other slit. The interference pattern is thus shifted to the right or
left depending upon orientation of the solenoid.