Driver to drive?

[Dave VanHorn]

I keep reading the AVRs have a cleaner internal design.

Indeed, they do.

No holes or pages in the ram.
Vectored ints
No pages in I/O
Three 16 bit pointer registers.
16 "W" register equivalents
16 more registers that aren't quite as nice.
Most instructions in happen in one clock.

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR

 

[Rich Grise]

On Tuesday 05 October 2004 12:23 am, John Woodgate did deign to grace us
with the following:

I read in sci.electronics.design that Rich Grise <null@example.net

It sounds so mundane, but I actually think they picked them because they
were the next letters in sequence to designate arbitrary stuff, much the
same way that they use Q for transistors, and U for ICs. E is volts, F is
Farads, G is conductance, H is hysteresis or Henrys or something to do
with the black magic of magnetics, I is duh, so J and K were next.

I think it's much more likely that they are just one of the
mathematicians' favoured pairs of symbols for variables. They are
particularly used as subscripts for array variables and indexes for
summations. R and S are another such pair and there is an R-S inside the
J-K, so the choice of another such pair to describe the more complex
configuration seems logical.
--

I was assuming that the "R" was "Reset" and the "S" was "Set." But what
could "J" and "K" stand for?

Thanks,
Rich

 

[John Woodgate]

I read in sci.electronics.design that John S. Dyson <toor@iquest.net>
wrote (in <ck3cpq$okr$1@news.iquest.net&gt about 'The Rational Mind of
Fred Bloggs', on Thu, 7 Oct 2004:

Actually, I am NOT doing a reverse anything, but simply being rational.
It is amazing that the mentally illness and unreasonable attitudes are
so clearly exposed by political discussion.

(Hint: it is okay to be for/against a candidate, but when hatred and
other kinds of semi-sanity start being exposed, then the Dems and their
supporters like Bloggs and Win start exposing their relative amounts of
(in)sanity. Frankly, psychiatrists who are starting their practices
should take a look at Dems posting on the various groups as potential
patient referrals.)

This bit of your post could have been written by Fred, in his mildly
rabid mode, with the minor edit I have made:

However, the hatred that
is obviously manifested by obviously mentally ill, politically
active people does show that yet another category of misfits or
dysfunctional people (neurotic or even psychotic people) are
constituents of the XXX party.

--
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

 

[John Woodgate]

I read in sci.electronics.design that Winfield Hill
<Winfield_member@newsguy.com> wrote (in <ck3d5e0ckh@drn.newsguy.com&gt
about 'The Rational Mind of Fred Bloggs', on Thu, 7 Oct 2004:

You can take you Hint and shove it up your ass.

Win, don't demean yourself. Rise above it. Take lessons from Rich. (;-)
--
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

 

[Dirk Bruere at Neopax]

Rich Grise wrote:

On Thursday 30 September 2004 04:39 pm, Paul Burridge did deign to grace us
with the following:


AIUI, Fawlty Towers is popular (or was) in Germany, but they never
released the episode entitled 'The Germans' which is a shame, as it's
actually self-deprecatory towards the Brits and makes us look
seriously *stoopid*. Even John Cleese thought witholding it was daft.
--

Withholding _anything_ with John Cleese in it is daft.

Ever see any of the marketing stuff he did with Video Arts?
Great.
http://www.dailyllama.com/bibliog/video/video.JCVA.html

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[Joerg]

Hi Getelec,

Usually they are just treated as separate opamps hooked up the the same supplies, the same nodes.


Regards, Joerg

http://www.analogconsultants.com

 

[John Woodgate]

I read in sci.electronics.design that John S. Dyson <toor@iquest.net>
wrote (in <ck3eut$okr$3@news.iquest.net&gt about 'The Rational Mind of
Fred Bloggs', on Thu, 7 Oct 2004:

Hatred is
problematic.

No, it's not 'problematic'. That's 'touchy-feely' woolly-mindedness.
Hatred is a manifestation of evil, and the simplest way to explain what
the concept of 'evil' is.

Hatred does no good to anyone, and in particular it distorts the
thinking of the hater, while either having no effect on the hatee or
resulting in assaults on him/her or his/her interests.
--
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

 

[John Woodgate]

I read in sci.electronics.design that Fred Bloggs <nospam@nospam.com>
wrote (in <41653DFC.2050606@nospam.com&gt about 'The Rational Mind of
Fred Bloggs', on Thu, 7 Oct 2004:

This is not quite true- and you should shut your damned mouth when you
don't have a hint in hell what's going on here.

And I love you, too, Fred. Do Democrats support free speech? Even
allegedly uniformed free speech?
--
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

 

[Joerg]

Hi Marco,

I'd consider a nice DDS chip. Since you need sine wave it should be
followed by switchable low passes. The switching can be done with SD5400
or with PIN diodes if you take those with a really long carrier
lifetime. PIN diodes may be a challenge at the 1MHz limit but look at
the Agilent HSMP series if interested in that approach. I have used
those as low as 3MHz, maybe lower is possible but I never needed that.

Regards, Joerg

http://www.analogconsultants.com

 

[John Woodgate]

I read in sci.electronics.design that Dirk Bruere at Neopax
<dirk@neopax.com> wrote (in <2sku50F1lhop8U3@uni-berlin.de&gt about
'Whmisy: If This NG Were a Zoo, WHere Would ou Be?', on Thu, 7 Oct 2004:

I think I'll go for rat.

White in the petting zoo or brown in the sewer?
--
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

 

[Nicholas O. Lindan]

"Mike Monett" <no@spam.com> wrote in message

John Larkin wrote:
On Wed, 06 Oct 2004 15:39:12 -0400, Mike Monett <no@spam.com> wrote:
Another issue is that you can't take n-bit data and digitally
correct it to n-bit data without nasty artifacts, missing codes
and ghastly differential linearity.

I'm not sure I understand. A sensor produces analog signals. You
digitize this to whatever accuracy needed, then use a polynomial or
lookup table to get the corrected value. The output is monotonic and
within whatever error tolerance you determine. There are no nasty
artifacts, missing codes or differential nonlinearity problems. So
where's the problem?

If the input data is 8 bits, say, and it is linearly expanded to a 16-bit
then only every 256th output value will have any data. Imagine 8 bit raw
A?D thermocouple readings over the range 0->1000F being converted to .001F
display: 39.062F jumps immediately to 42.969F.

If the resolution of the input and the output are about the same then there
is no problem.

This crops up in digital photography when a limited color/tonal range is
expanded to increase contrast. You end up with a 'picket-fence' distribution
of pixel values and the output looks posterized - quantized to the cognessetti,
but it was just as quantized in the input data, one just didn't see it.

If the input signal has exactly 1 bit measuring quantization of noise then the
problem can be mitigated by simply filtering the expanded signal. A very
poor man's sigma-delta high-res conversion, so to speak.

A good use of this technique is an asynchronous V/F converter. The sampling
interval during which one counts transitions is sliding past the V/F output
and so the output value is modulated via PWM of the last bit. The trade-off
is trading temporal for temperature resolution, say.

--
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/

 

[mike]

Wouter van Ooijen (www.voti.nl) wrote:

For "real chips", it depends on the logic family. 74xxx families
tend to trigger on the negative edge or level, for noise immunity
reasons. CD40xx stuff tends to trigger on the positive edge or level.
There are many exceptions (not to mention the newish part numbers like
74HC4013 which mix both part numbers together!). Maybe more exceptions
than agreements... the most popular TTL D-flip-flops work on positive
levels/edges.

The "bare part" is a hopeless quest because the real bare parts are
transistors and resistors and diodes, not "flip-flops".

You really need the truth table/state table for the flip-flop in question.


I think you misunderstand my question. I want to know the
interpretation of the symbol. A square with a wedgie in it, with a
line going into the wedgie. Is that supposed to denote a
positive-edge-triggered thingie or a negative-edge-triggered thingie?
Or does the answer depend on the kind of thingie, D or JK FF? Or dies
it also depend on old-style versus IEEE symbol?



Wouter van Ooijen

-- ------------------------------------
http://www.voti.nl
Webshop for PICs and other electronics
http://www.voti.nl/hvu
Teacher electronics and informatics

It's interesting to debate the standards. But in the end, the only way
to know for sure is to look up the vendor data on each specific part.
The fact that the part symbol fits the standard 99.99% of the time is
small consolation when your circuit doesn't work.
mike

--
Return address is VALID.
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Wanted GPIB Card for PC.
Bunch of stuff For Sale and Wanted at the link below.
http://www.geocities.com/SiliconValley/Monitor/4710/

 

[John Woodgate]

I read in sci.electronics.design that Mark <Mark@?.?> wrote (in
<nieam09thhf22ius6ce1dgd91qukfb7sen@4ax.com&gt about 'Amplifier
Oscillating Help Please', on Thu, 7 Oct 2004:

I also have a 1Mfd cap on the
output.

That sounds like a problem to me. What do you mean 'on the output'? If
you have '1 uF plus a low resistance' connected to ground, the op-amp
will very likely oscillate.
--
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

 

[John Woodgate]

I read in sci.electronics.design that Don Taylor <dont@agora.rdrop.com>
wrote (in <H5CdnUh-nYFT5fjcRVn-pg@scnresearch.com&gt about 'safe
electronic brain stimulator', on Thu, 7 Oct 2004:

There are published results in the journals out now that show much lower
levels of magnetic fields, thousands of times lower or even smaller,
have observable effects on the brain.

Please give specific citations. If true, this is very important. But I
suspect it is fantasy.
--
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

 

[Dirk Bruere at Neopax]

John Woodgate wrote:

I read in sci.electronics.design that Dirk Bruere at Neopax
dirk@neopax.com> wrote (in <2sku50F1lhop8U3@uni-berlin.de&gt about
'Whmisy: If This NG Were a Zoo, WHere Would ou Be?', on Thu, 7 Oct 2004:


I think I'll go for rat.


White in the petting zoo or brown in the sewer?

Brown - in the petting zoo.

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[Dirk Bruere at Neopax]

John Woodgate wrote:

I read in sci.electronics.design that John S. Dyson <toor@iquest.net
wrote (in <ck3eut$okr$3@news.iquest.net&gt about 'The Rational Mind of
Fred Bloggs', on Thu, 7 Oct 2004:

Hatred is
problematic.


No, it's not 'problematic'. That's 'touchy-feely' woolly-mindedness.
Hatred is a manifestation of evil, and the simplest way to explain what
the concept of 'evil' is.

No it isn't.
That's just dualistic Xian crap.

Hatred does no good to anyone, and in particular it distorts the
thinking of the hater, while either having no effect on the hatee or
resulting in assaults on him/her or his/her interests.

If that were really true evolution would have weeded it out long ago.

--
Dirk

The Consensus:-
The political party for the new millenium
http://www.theconsensus.org

 

[Nicholas O. Lindan]

"Mike" <comixnewb@yahoo.com> wrote

Well alot of the things they repeat are off the ball things that I say
and do

Yes, well, that is a bit off the ball. You are just going to have to resign
yourself to being the creator of new sayings, such as such classics as:

o 'One swell foop'
o 'Dad, do you want the destructions?' : Christmas morning when assembling a
....

People will repeat these things because they have some value - they are
amusing and appropos. Nothing you can do about it. You are a bit of a
natural born comic.

Try to think about what you are saying - say the words slowly to yourself in
your head before speaking them. It is like typing: s p e l l out the words as
letters in your head as you press the keys and you will not make many typos.

There is no need to get paranoid. And for God's sake don't let other
kids think you are paranoid, they will make a real play on that.

OnT:

Checking for bugs with a radio is called 'howling'. Any old radio
will work: when the radio is tuned to the bug's transmit frequency there
will be feedback loop from the radio's speaker to the mike back to the
radio and out the speaker ... It will be a _real_ howl. As the radio
gets closer to the mike the howling will get a whole lot louder.

Most FM mikes work just outside the FM broadcast band. Find an old
mechanically tuned radio where the tuning goes past the limits, it
should pick it up.

Remember: Your friends can rile you a lot better (and far more
easily) by making you think you are bugged than by bugging you.

--
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/

 

[Nicholas O. Lindan]

"john jardine" <john@jjdesigns.fsnet.co.uk> wrote

I'd love to reread and actually *understand* what Poul was on ...

I don't know what it was, but I am sure you can buy it in Denmark.

--
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/

 

[John Larkin]

On 7 Oct 2004 12:31:43 -0700, soar2morrow@yahoo.com (Tom Seim) wrote:

Mr. Kerry is now promising to negotiate directly with North Korea in
hopes of signing another such deal. As it happens, within 48 hours of
Mr. Kerry's one-on-one negotiating pledge last Thursday, the North
Korean government called off all nuclear discussions with South Korea.
It's pretty clear whom Kim Jong-il is waiting to sit down with.

So, what's Al Queda's optimum strategy prior to the election? Probably
maximum terrorism in Iraq and none in the USA.

John

 

[Nicholas O. Lindan]

"Le Chaud Lapin" <unoriginal_username@yahoo.com> wrote

For the traditional method of type encoding on a 32-bit machine using
one bit per position to indicate type of an object, you get 32
positions for 32 different types:

GIRL = 1 << 7, BOY = 1 << 8, ...and so on.

But if you use Godel factoring:

THING = 1, PERSON = 5, GIRL = PERSON * 17, BOY = PERSON * 23

Good Godel!

Given 32 bits I have my choice of 4.3 billion phrases. That's more
unique phrases (4e9) than man has concepts (3e0, by the last VP debate).

One can always shift knowledge from the decoding algorithm to the data.
The ultimate is to send one bit: 'create universe'.

--
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/