Driver to drive?

[keith]

On Mon, 17 Jan 2005 20:59:52 -0600, John Fields wrote:

On Mon, 17 Jan 2005 20:18:17 -0500, keith <krw@att.bizzzz> wrote:

The record shows that she wasn't a top-poster, so you have a lot of
learning before you're worth a that nickel (it is *nickel*, twat).

---
The element is 'Nickel', the coin a 'Nickle'.

Sorry. :-(

Umm, not according to Mr. Webster (though your spelling is listed as a
deviant ;-):

http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=nickel&x=0&y=0

2 a (1) : the U.S. 5-cent piece regularly containing 25 percent
nickel and 75 percent copper (2) : the Canadian 5-cent piece b : five
cents

--
Keith

 

[Kryten]

"Reg Edwards" <g4fgq.regp@ZZZbtinternet.com> wrote in message
news:cshtd3$jjm$1@sparta.btinternet.com...

Or move to Dudley.

If it's good enough for Lenny Henry, it can't be too bad.

Then again he didn't live there once he'd made it!

 

[Kryten]

"Jim Thompson" <thegreatone@example.com> wrote in message
news:dkvou0tl4l3f73ovum6flbv2ilel590fit@4ax.com...

It's so warm here this week I may have to turn on the air conditioning
;-)

It's so miserable here this week I may have to watch the tsunami news to
remind me there are people with bigger housing problems than me.

;-(

 

[Mac]

On Mon, 17 Jan 2005 18:18:31 +0000, Joerg wrote:

I had to redesign a few video circuits because they would occasionally
become unstable. To tell you the truth, I kicked the opamps out of
almost all of them and replaced them with transistors of the 10 cent
category.

This is very interesting. How many transitors and in what configuration?
Do you rely on relatively high voltage rails (like +/- 12) or can it be
done easily with, say, +/- 5?

Regards, Joerg

http://www.analogconsultants.com

--Mac

 

[Kevin]

On Mon, 17 Jan 2005 18:28:34 -0500, Mark Jones <abuse@127.0.0.1>
wrote:

Hmmm... 10mS is not a long time at all... and the EEPROM has a
1-million write cycle life... is that not good enough? If not, cycle
through the EEPROM bytes as they are being written and it could last
for hundreds of millions of cycles.

Well, I was thinking of the possibility of a power glitch or sag in
which the Vcc to the PIC fails while it is writing EEPROM. If this
happens, then the byte currently being written is now corrupt. Also
I'm guessing it probably isn't good for the EEPROM to have the power
fail while writing (I was thinking that the high voltage needed to
generate the erase voltage is generated by the on-chip charge pump
using Vcc. What happens if Vcc fluctuates or droops while writing?
Does this affect EEPROM reliability in some way or does it just
corrupt the EEPROM byte being written to?)

Probably for quite awhile, but don't forget about internal
resistances. The cap would probably go dead on its own accord long
before a 99.2% sleeping PIC would kill it.

Will add some supercaps to the next parts order - I always wanted to
play around with them anyway ;-)

Kevin.

 

[Kevin]

On Mon, 17 Jan 2005 09:22:45 -0500, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

Another possibility the OP should look at is to tack an external
serial (I^2C or SPI) FRAM memory onto the micro. Fast write,
nonvolatility without batteries or long write cycles, and a lot more
storage capacity than the very limited PIC RAM.

Just had a quick look at Ramtron's FM25040 - 4Kbit FRAM Serial Memory
(SPI interface) - looks real nice!

It appears to be fast, SPI interface, low power, and most important of
all, virtually unlimited writes.

Which means that it's probably expensive and not available in DIP ;-)

What's the cost of these things in small quantities? (Digikey isn't a
ramtron distributor ;-(

For what I'm tracking I don't really need a lot of ram storage space
(internal PIC ram is fine). So maybe this FM25040 is an option.

Kevin.

 

[Rick Thompson]

On Tue, 18 Jan 2005 00:23:43 GMT, "Kryten"
<kryten_droid_obfusticator@ntlworld.com> wrote:

Well I can point you to my online CV for a fuller story if you mail me your
email address.

Afraid I'm not employing! And I'm sick of CVs.

one hi-tech agency covering Cambridge (www.ecmselection.co.uk)

I found ECM promote themselves as only dealing with 'top' talent (i.e. those
easy to place and earn fattest commission). Which is fair enough but they
are rather dismissive if you are not.

I'd forgotten they were a bit snotty. I got some CVs from them a few
months ago and they were all pretty upmarket. The best CVs I got, in
terms of long-term potential, were from Positive Selection in Norwich;
might be worth giving them a go.

I mean, if you meet a girl and she isn't all you hoped for, you don't drop
the smile, say "Sorry, not interested" and walk off.

You'd be crazy to get a room in Arbury.

It does seem to have a good share of crazies, drunks, druggies, dealers,
murderers etc.

Anything off Mill Road should be the same price

That room was off Mill Road. On Devonshire road, near the Devonshire
Arms(!).
Handy if you are looking for some Caribbean atmosphere.
Or want to roll your own.

At least you're never short of a take-away..

My guaranteed income (excludes contract work) is Ł132/wk, enough for food
and rent.
So Ł400 pcm would leave Ł40/week between contracts

Surprising; maybe real incomes have dropped. I was in your position
from about '82 till about '95. I don't think I was ever once short of
money; sometimes you'd spend money just for the sake of it, even in
the early 90's (the last major bust before 2001).

Milton Rd, exc. Arbury, nr the Science Park.

I heard Milton had some problems with its Traveller community.

I wouldn't go to Milton itself - Milton Rd south of the Science Pk.
Apart from anything else, you're within half a mile of a landfill, not
to mention a sewage works.

Cheers

Rick

 

[Mr. T]

"Arny Krueger" <arnyk@hotpop.com> wrote in message
news:27udnahabtYAvnbcRVn-3g@comcast.com...

IOW the AP test equipment does not have 20-20K THD+N residuals that are 10
dB better than the best audio interfaces.

Of course not, unless you can operate it near absolute zero

MrT.

 

[Stuart Brorson]

In sci.electronics.cad Chuck Harris <cf-NO-SPAM-harris@erols.com> wrote:
: Problems/complaints:

: 2) The schematics in the examples are all composed of main pages with
: the transistors and diodes being subpages. There is no obvious (to me
: the new user) way of making the link so the transistors appear on the
: schematic. Examples are presumably meant for new inexperienced users,
: and as such should work flawlessly.

Please help me improve the linkage between these schematics. Is your
point that you can't open the lower-level schematics from the top
level schematic via "Hierarchy -> Down Schematic"? If so, it was a
bug in the examples; I have just fixed it.

If you want, try the fix. Edit your gafrc (living in the RF_Amp
directory), and add the line (on a new line):

(source-library ".")

Then, open MSA-2643.sch, double click on Q1, and add the following
attribute to it:

Attrbute name: source
Attribute value: Q1.sch

Do the analogous thing for Q2. Then you should be able to use
"Hierarchy -> Down Schematic" in the top menu bar to dive into the
models for Q1 & Q2.

Please let us know if this works for you.

Thanks,

Stuart

 

[Kryten]

"Rick Thompson" <nospam@nospam.com> wrote in message
news6mpu0ph5kghoqef24i2a5nrugqsdn4e72@4ax.com...

were a bit snotty.

Yes, that was the word I was going to use.

Positive Selection in Norwich;

Thanks for the tip.

That room was off Mill Road.
At least you're never short of a take-away.

Yes, splendid substantial eats to be had on Mill Rd.
The Curry Queen for instance.

Surprising; maybe real incomes have dropped.

Well, that is for a part time job. On average I bring in significantly more
but I took that job to guarantee food and rent. Many people prefer to see
regular wage slips than irregular contract invoices. Hence I currently do
1.5 jobs. It also leaves me free during the day to do the contract work.

I was in your position from about '82 till about '95.
I don't think I was ever once short of money

I'm not short either, but I do save as much as I can for the eventual house
purchase.
I make a point of living within my income not savings, that's all.

I wouldn't go to Milton itself - Milton Rd south of the Science Pk.
Apart from anything else, you're within half a mile of a landfill, not
to mention a sewage works.

I used to work by the Science Park.
Sometimes one did have to close the windows!

 

[Kevin Aylward]

Kryten wrote:

"Kevin Aylward" <salesEXTRACT@anasoft.co.uk> wrote in message
news:OS3Hd.134140$C8.97458@fe3.news.blueyonder.co.uk...
Kryten wrote:
I mean, if you meet a girl and she isn't all you hoped for, you
don't drop the smile, say "Sorry, not interested" and walk off.

Evolution is a maximising game.

I referred to common courtesy. Women _will_ notice a smile vanishing
quickly: it shows you are only nice and friendly when you want
something and not as a matter of course. Besides it indicates you
place no other value on them as a human being.

There is a kind of karma working: if you treat people rudely, they
will moan about it to friends and it will probably backfire on you.
One ex boss left a trail of pissed of people in his wake, eventually
nobody would do business with him and he went bust. For my own part,
if I ever employed people I would give job agencies very short shrift.

You wont get many applicants. Seriously. Agencies are the focal point
for both employer and employee. Its just the way things are done in this
market, today. Sure, on occasions you might be lucky with a direct
application, but this not normal, in my view.

As in the women case, i.e. there are always males willing to have
sex so they can be very choosy, the glut of engineers means agencies
and companies can be very choosy.

Being choosy is one thing, being snotty is another.

Someone said "commerce makes prostitutes of us all".
In which case agents are pimps getting rich off us bitches.

Oh, as far as women go "all one hopes for" is that she is not fat.
That's an absolute no no by my book.

Well not grossly obese as I've seen in the USA, but I've seen some
plump girls with nice curves, nice personality, nice mind etc and
some slim girls with none of those.

Call me mister choosy if you will, but my list of absolute no-nos
includes
Mental illness, genetic defects, infectious diseases, beer belly,
flab. Compulsive drinking / shopping / smoking / nagging / eating /
dieting / cleaning / anything.
Drama queens / proper little madams / snotty bags / drug users /
religious or political extremists / new agers / swingers / married or
spoken for.
Cut the choice down a lot I find!

The last one cuts the choice down to zero. Females are *always* already
taken. You *have* to steal them off someone else.

Kevin Aylward
salesEXTRACT@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.

 

[John Woodgate]

I read in sci.electronics.design that Andrew <xxragexx@gmail.com> wrote
(in <1106056575.788471.81360@f14g2000cwb.googlegroups.com&gt about 'DC
Motor Control - Heat Issue', on Tue, 18 Jan 2005:

The frequency is very low, it is only up to 7.8kHz, not even quite
10kHz. Any suggestions for something to fit these specs?

What is the lowest frequency the inductor will see, and what voltage at
that frequency could appear across it? What is the maximum DC resistance
you can accept? To design the inductor, those figures are necessary, so
I've asked for them. However, I doubt that I will have time to design
the part for you within the next 7 days, so maybe someone else will
volunteer.
--
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

 

[Kryten]

"Kevin Aylward" <salesEXTRACT@anasoft.co.uk> wrote in message
news:WL8Hd.137634$C8.35238@fe3.news.blueyonder.co.uk...

Kryten wrote:
For my own part,
if I ever employed people I would give job agencies very short shrift.

You wont get many applicants. Seriously. Agencies are the focal point for
both employer and employee. Its just the way things are done in this
market, today. Sure, on occasions you might be lucky with a direct
application, but this not normal, in my view.

Agencies seem to be another hurdle in the way then.

Originally you just had to persuade an employer you was worth their time.
I don't find that too difficult.

Now you have to persuade an agent you are worth their time.

I wish some geeks would set up an automated system that registered people's
profiles of what they can offer and correlate them with what profiles were
wanted. The system would then return a list of best matches. Current systems
seem to just look for buzzwords in CVs, they do not know about skill
ratings.

my list of absolute no-nos includes married or spoken for.

The last one cuts the choice down to zero.
Females are *always* already taken.

Attractive people are taken most of the time.
There's always plenty of unattractive people who are not taken.
But they were not a choice in the first place eh?

You *have* to steal them off someone else.

Damn my own integrity for closing this option.


Hmm, that people to vacancy correlating system might also correlate people
to people.


It would replace the world's human dating/job agencies with one automated
matching system.

I'd like to name it Robopimp but it might offend the prudish..

 

[John Larkin]

On Tue, 18 Jan 2005 14:50:20 GMT, "Kryten"
<kryten_droid_obfusticator@ntlworld.com> wrote:

It would replace the world's human dating/job agencies with one automated
matching system.

Interestingly, dating services don't work very well. If two peoples'
objective profiles are matched - height, weight, careers, interests,
all that usual stuff - it doesn't at all indicate that anything will
click when they meet. It's far more effective to let them just sniff
one anothers' used t-shirts; HLA antigen matches (or, actually,
mismatches) are what makes for romance.

John

 

[Andrew]

John,

The frequency is always 7.8kHz.

The voltage range is roughly 0-26V.

As far as DC resistance, the lower the better. This would be a DC
Motor choke inductor, to be used on the PWM output of the motor driver.
The PWM output is driving two DC motors with resistance 0.312ohms
each, and inductance of 80uH each. I'm not sure what resistance will
start to mess up the motor?

By "design" you mean research available components? I can do the
research, I have looked any many companies, but I think that I am
having two problems: I'm not sure EXACTLY what I need, and from what I
think that I need, the current ratings on almost every inductor I have
found is much too low. A suggestion on companies to look into would be
helpful.

A selection from a big company like digikey or allied would be great,
if possible. Something like this:
http://rocky.digikey.com/WebLib/Hammond/Web%20Data/153%20thur%20159%20Series.pdf
on digikey seems alright, for, say, two 1mH 10A rated inductors in
parallel, but the weight at 1lb. each is a bit heavy for this
application. Also, this is not a stock part.

Any thoughts?

Thanks again,
Andrew Czop

John Woodgate wrote:

I read in sci.electronics.design that Andrew <xxragexx@gmail.com
wrote
(in <1106056575.788471.81360@f14g2000cwb.googlegroups.com&gt about 'DC
Motor Control - Heat Issue', on Tue, 18 Jan 2005:

The frequency is very low, it is only up to 7.8kHz, not even quite
10kHz. Any suggestions for something to fit these specs?

What is the lowest frequency the inductor will see, and what voltage
at
that frequency could appear across it? What is the maximum DC
resistance
you can accept? To design the inductor, those figures are necessary,
so
I've asked for them. However, I doubt that I will have time to design
the part for you within the next 7 days, so maybe someone else will
volunteer.
--
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

 

[Kryten]

"John Larkin" <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX> wrote in
message news:uc9qu0d3k7gtsecbsll9iktpqsnsrvsnqt@4ax.com...

Interestingly, dating services don't work very well.

That's because they are very primitive.
They just have a few dozen tick boxes.

One survey found that agencies would often just send back whoever lived
nearest to you (ignoring everything else) or send you matches that lived all
over the place.

If two peoples' objective profiles are matched -
height, weight, careers, interests,
all that usual stuff - it doesn't at all indicate that anything will
click when they meet.

I think it does maximise the chances.

It will cut out the bulk of people who you expressly do not want.

Such as obese, smokers, shopaholics etc.

It's far more effective to let them just sniff
one another's used t-shirts; HLA antigen matches (or, actually,
mismatches) are what makes for romance.

I find that hard to believe. Where did you read it.

If it is true, maybe the system would sift out people you wouldn't get on
with for sure, then send you scratch-n-sniff cards for the shortlisted
candidates.

Maybe it does play a part in long term bonding, but the sense of smell has
declined over time. We hardly have any sense of smell compared with most
animals.

However, some people do have smells even I can detect. One girl I met smelt
very strongly of sweat, but clean so not as bad as it sounds. OTOH, one of
my geeky workmates often smells of sweat, but rancidly. I'll have to
politely suggest he bathe more often.

 

[mike]

Kevin wrote:

On Mon, 17 Jan 2005 09:22:45 -0500, Spehro Pefhany
speffSNIP@interlogDOTyou.knowwhat> wrote:


Another possibility the OP should look at is to tack an external
serial (I^2C or SPI) FRAM memory onto the micro. Fast write,
nonvolatility without batteries or long write cycles, and a lot more
storage capacity than the very limited PIC RAM.


Just had a quick look at Ramtron's FM25040 - 4Kbit FRAM Serial Memory
(SPI interface) - looks real nice!

It appears to be fast, SPI interface, low power, and most important of
all, virtually unlimited writes.

Which means that it's probably expensive and not available in DIP ;-)

What's the cost of these things in small quantities? (Digikey isn't a
ramtron distributor ;-(

For what I'm tracking I don't really need a lot of ram storage space
(internal PIC ram is fine). So maybe this FM25040 is an option.

Kevin.

Sanity Check.
Over the decades I've seen engineers go to great lengths to fix problems
that don't exist. Might be a good time to re-examine your priorities.
I'm to lazy to reread the whole thread, but as I recall, you don't have
to log while the power is off. So...
How often does the power go off?
How long does it stay off?
What are the consequences of losing a data sample?
If you do nothing, how does the probability of losing a sample compare
to the probability of system failure due to other casues?
What additional failure modes are created by the "fix"? Does the
reduced reliability of the system create more problems than it solves?
Is cost no object?
If it's a manned mission to the moon, you should behave differently than
if it's logging temperature in your back yard.

What if you sensed power failure and copied RAM to Flash? That solves
the write cycle limitation and long term storage problems.
How much energy does that take? Multiply that by how many times it
might happen.
How does that affect your mAH requirements over the life of the device?
Could you manage it with a simple capacitor? If you put your energy
reservoir at the input of the regulator, you get much longer holdup per
farad...and you don't need any diodes or fets or external RAM.

Sometimes it's more productive to be clever than to try to be perfect.
mike
--
Return address is VALID.
Wanted, PCMCIA SCSI Card for HP m820 CDRW.
FS 500MHz Tek DSOscilloscope TDS540 Make Offer
http://nm7u.tripod.com/homepage/te.html
Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
Bunch of stuff For Sale and Wanted at the link below.
http://www.geocities.com/SiliconValley/Monitor/4710/

 

[Andrew]

John,

Thanks alot for your time and help!

Unfortunately, a custom part for this application wouldn't go over well
with the project. The project calls for widely available parts.
Custom parts in this application are frowned upon, as they are no
longer available commercially-off-the-shelf. This is reason for using
the motor driver that we are, as opposed to designing one ourselves.
It is becoming more clear, however, that it may be necessary to design
a custom h-bridge for this application!

Thanks again for your time, but I really don't think a custom inductor
would suit our needs.

Sincerely,
Andrew Czop

 

[Pig Bladder]

"Kevin Aylward" <salesEXTRACT@anasoft.co.uk> wrote in message

You *have* to steal them off someone else.

Apparently, Mr. ailwierd is of the "Women are property" school of naziism.
--
The Pig Bladder From Uranus, Still Waiting for
Some Hot Babe to Ask What My Favorite Planet Is.

 

[Rich The Philosophizer]

On Tue, 18 Jan 2005 07:08:49 -0800, John Larkin wrote:

On Tue, 18 Jan 2005 14:50:20 GMT, "Kryten"
kryten_droid_obfusticator@ntlworld.com> wrote:

It would replace the world's human dating/job agencies with one automated
matching system.


Interestingly, dating services don't work very well. If two peoples'
objective profiles are matched - height, weight, careers, interests,
all that usual stuff - it doesn't at all indicate that anything will
click when they meet. It's far more effective to let them just sniff
one anothers' used t-shirts; HLA antigen matches (or, actually,
mismatches) are what makes for romance.

Or, one could undeny one's feeling-sense, and simply _know_.

Good Luck!
Rich