Quite the masterstroke ;-)

I have some adjustable wall-warts with exchangeable plugs.

The voltage is unregulated of course and not much current, but they work for such stuff that has a regulator on it.


ST

Well, I know for sure what won't work!

I had a 100' spool of 24 gauge solid core wire handy with both ends of
the cable exposed. I stripped off some conductors, spliced it into the
bread board circuit for the SPI wires. No-go, so, now I know!

100 feet - too long for SPI ;-)

Chris

Hmm,

Working alot between my bread board and the programming board for my
project, I got fed up with the mess of wires. I was using the power
supply on my little machine for powering the programming board
(STK500). Feeling cramped and tied up in wires I set out to fix it.

I had a wall wart of the correct voltage/current for the stk500, but
no plug on the end. So, I started searching through my collection
of wall warts, and found the right shaped end to fit the socket on
the stk500. Happily cut it off, soldered it onto the other wallwart
being very careful, using shrink tubing etc. Great job splicing the
wires together and it looks good and works good - job well done!

A couple hours later, I went to clean up my mess and for some reason
decided to look that the voltage/current ratings of the wall wart I
took the end off of. Hmm, that's funny, that is the same brand,
voltage, and current as the one I used for the STK500. Being
confused, I went back in the office, and the one on the stk500 is
the correct one as well! I guess I had two identical wall warts,
one with a plug and one without. Had I only read the lable first :-)

CHris

:-)

I am telling you guys, these are not real messages - they are some
sort of spam, or perhaps some bored kid or something.


--- In Electronics_101@..., "Roy J. Tellason"
<rtellason@...> wrote:

On Sunday 30 April 2006 10:35 am, waqas shafiq wrote:

Hello,
I waqas is the new member of this group i joined this group

for getting

new information and reserch papers kindly anyone of u found

something new

send it to me ...take care ......bye

Research papers? Nope, never saw any of them around here...

Dunno if there's "new" information or not, you might be better

off looking

elsewhere for that.

In the meantime, if you (NOT "u") have any specific questions

feel free to

ask.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that

can

be killed but can't be tamed. --Robert A. Heinlein, "The Puppet

Masters"

-
Information is more dangerous than cannon to a society ruled by

lies. --James

M Dakin

On Sunday 30 April 2006 10:35 am, waqas shafiq wrote:

Hello,
I waqas is the new member of this group i joined this group for getting
new information and reserch papers kindly anyone of u found something new
send it to me ...take care ......bye

Research papers? Nope, never saw any of them around here...

Dunno if there's "new" information or not, you might be better off looking
elsewhere for that.

In the meantime, if you (NOT "u") have any specific questions feel free to
ask.

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

---

Love cheap thrills? Enjoy PC-to-Phone for just 2???/min with Yahoo! Messenger with Voice.

--- "koferong" <koferong@...> wrote:

Does anyone have a suggestion for a commercial-off-the-shelf
development toolkit that takes 5 load cell analog signals as

parallel

inputs and generate a TTL signal whenever each load cell input

falls

under a set value? The load cell output is between 0-200mV. I'm
looking for a experimental toolkit that is pretty much self
contained, with the exception of perhaps the power supply.

I did not see any replies to this by simply looking at the links
below, but the thread may be split -- so this might be redundant (I
am a few days behind here).

I do not know of a COTS product, but it sounds as if you simply want
a device to give you a logic "high" signal when 5 input lines fall
below some threshhold?

Disclaimer: 5 minutes ago, I did not know what a "load cell" was --
I had to look it up. I understand that it is a type of transducer
that converts force (for instance, weight) into a measurable
electrical output (voltage).

Ok, if that understanding holds, then the simple answer is "no, I do
not know of a commercial product."

However, building one might not be that difficult. Looking into my
magic circuit ball, I see a high precision OP-Amp circuit that
scales your 200mV output to 4.5V (to give yourself some hysteresis -
is that the right usage of the word? - in case you exceed 200mV).
Then, I see a precise 5V supply sourcing VERY low current through a
multi-turn trim-pot to set your target threshhold. Then, the outputs
of the OP-Amp circuit and the trim-pot feed into a schmidt trigger
comparitor.

Designing the circuit might take minutes for the other folks on this
list. For me, it might take some trial and error. But, it should be
doable in a few hours. So, you can always build one on your
breadboard, then 5 of these circuits.

Of course, I may be WAY off based on the number of assumptions I am
making here... any other comments?

HTH,

Bob H.

For up/down counters try the CD4029. 4000-series CMOS is real pokey
when it comes to speed. This is good. It simply cannot narrow noise
pulses that would give false counts when using faster IC logic
families.

Mariss

--- In Electronics_101@..., "Daniel Nicoson"
<A6intruder@...> wrote:

A very knowledgeable person has suggested that I uses a CMOS binary

counter

to set up a circuit used to test my SMPS.

I need to take a look at Digi-Key or Mouser and select a binary

counter.

I think your basic commodity grade might work.

Any favorite IC's ?

I am working with 80kHz signal if that is a selection factor.

I will read up on the use of these things but if you guys are using

these

you might know what is reliable item.

Thanks,

Dan Nicoson

--- In Electronics_101@..., "lcdpublishing"
<lcdpublishing@...> wrote:

Hi Guys,

Having lost enough hair trying to get i2C working with BASCOM, I
dropped it and switched to the SPI interface. Got that working
within a couple of minutes as opposed to countless hours getting
nowhere with i2C.

Anyway, being new to SPI, I don't know what the limitations are for
it. I would like to have the SPI master in a sepperate cabinet from
some of the SPI slaves. I am guessing the total cable length would
be about 3 feet - shielded cable if that maters.

I will try a test on the breadboard (yes, I am doing this on a
breadboard :-)). But I would also like to hear if there are any
cautions etc.

Thanks guys

SPI as implemented by the micro is still a 5v logic signal although it
does have active pull-up. Cable capacitance didn't improve with the
change in protocol so I wouldn't expect it to run at longer distances,
at least not a lot longer. The thing with SPI is that it wants to run
a lot faster than I2C. This is going in the wrong direction for using
long lines.

So, you will have to watch the speed and look at the signals with a
scope. Long rise times will be just as much of a problem with SPI as
it is with I2C.

I2C can be a bear to debug. However, there are bus buffers available
- at least one of which will extend I2C to one mile. But, it is
another component, more board space, etc.

I haven't implemented it but I do like the ROBIN protocol for RS485
over at BDMicro - That may be out
of the question for Basic. It's probably not a coincidence that both
of the current BD Micro boards have RS485 drivers with ATmega128 chips.

Richard

Chris

:-) Glad to hear the woodworking went well for you! Too bad you
don't live around here, I could have actually repaid one of my many
debts to you and helped out!

Chris


--- In Electronics_101@..., "Stefan Trethan"
<stefan_trethan@...> wrote:

The printers are on a lan printserver. But i was thinking about

getting a

LPT from the PC to the electronics bench for micro programming. It

works

fine with 2 extensions right across the room, but i'm not sure it

would be

OK to make a permanent cable that would need to take a longer way.

Not

really a problem.

Serial is great in terms of cable length, no problems there. But i

really

didn't expect USB to be acting up with only a few meters more.

BTW i'm writing to you from the electronics bench! Still the 15"

screen

but the keyboard and mouse are wired up and the drawer for them

is

installed under the table. The woodworking went better than

expected,

managed to follow a straight line with the jigsaw by wearing a

faceshield

which allowed me to actually see where i'm going close up.

Anyway, learnt my lesson today about cable length. I used to use

just

about anything for just about any signals (including unshielded

telephone

wire to make a VGA cable!), but this was the first time that it

would

actually just not work at all.

ST


On Sat, 29 Apr 2006 22:36:52 +0200, lcdpublishing
<lcdpublishing@...> wrote:

To get around all that, I have all of my printers that are not

on my

desk (3 on the desk) connected to lan. Those printers are on a

different level in the building so running parallel cables was no

option at all. Serial wasn't an option either - 1 is a color

laser,

1 is a high-speed duplexing laser, and the other is the ink jet

plotter. The two lasers require a substantial amount of data

transfer.


Chris

开云体育

On Saturday 29 April 2006 08:30 am, Shawn Upton wrote:

alldatasheet.com, that's what it is--it is a link on my work computer, not
something I remember off the top of my head.

I've used them a lot. But recently they decided that they were going to add a
page to each datasheet, making the indicated size and page count wrong, so
that means more time to download, more space taken up with the same stupid
nonsense over and over again... I hate it when they do that!

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

On Saturday 29 April 2006 04:28 am, Stefan Trethan wrote:

Hwo on earth decided a table is a good idea to put on a table saw? it is a
prime surfact for cluttering up!

:-)

Sounds a lot like here, where every horizontal surface tends to accumulate
"stuff"...

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

On Thursday 31 May 2001 07:01 am, Giuliani wrote:

Roy,
I have saved the data sheet, then printed, scanned and compressed the first
page. I think it is still readable. It is 150kB. If you want I can send it
to your e-mail, and, if you think it is OK, I can make the same for the
remaining six pages.

Bye.
Giuliano

Thanks for the offer, but Shawn Upton sent it to me via email and I can read
it all just fine. Something about me and the connection to that site, I
don't know what the problem was...

----- Original Message -----
From: Roy J. Tellason
To: Electronics_101@...
Sent: Saturday, April 29, 2006 7:27 AM
Subject: Re: [Electronics_101] datasheet
I normally use alldatasheet.com, or perhaps one or two others. Nobody
seemed to have it, but datasheetarchive.com did list it. However I've
been spending an absurd amount of time here trying to download it, and not
been successful at it -- the site lists that datasheet as being 4628.53KB
in size (a bit large, to be sure) and I get partway through that and at
different points both ends seem to decide that the transfer is done and it
stops. And the best I've been able to do is 1,160,869 bytes so far. And
I've got other things to do, so I'm giving up on it for now. I've emailed
to the address listed on that page, we'll see if I get a response...

--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin

The printers are on a lan printserver. But i was thinking about getting a LPT from the PC to the electronics bench for micro programming. It works fine with 2 extensions right across the room, but i'm not sure it would be OK to make a permanent cable that would need to take a longer way. Not really a problem.

Serial is great in terms of cable length, no problems there. But i really didn't expect USB to be acting up with only a few meters more.

BTW i'm writing to you from the electronics bench! Still the 15" screen but the keyboard and mouse are wired up and the drawer for them is installed under the table. The woodworking went better than expected, managed to follow a straight line with the jigsaw by wearing a faceshield which allowed me to actually see where i'm going close up.

Anyway, learnt my lesson today about cable length. I used to use just about anything for just about any signals (including unshielded telephone wire to make a VGA cable!), but this was the first time that it would actually just not work at all.

ST

Daniel Nicoson wrote:

A very knowledgeable person has suggested that I uses a CMOS binary counter
to set up a circuit used to test my SMPS.
I need to take a look at Digi-Key or Mouser and select a binary counter.
I think your basic commodity grade might work.
Any favorite IC's ?
I am working with 80kHz signal if that is a selection factor.

At that low a clock frequency, the 4000 series CMOS is plenty fast and operates with a supply ranging from about 3 to 18 volts. Some counters you might use are:

Isn't that strange :-(

It used to be you would use a serial interface because it allowed
for greater cable lengths. Parallel interfaces like the printers
were problematic over 10 feet whereas RS232 serial is good up to 100
feet (and in reality 1000 feet with good cables and ports).

The longest I ever got a printer cable to work good with my lasers
(using the parallel interface) is 9 feet. The next extension cable
increment took me up to 16 feet (if I remember correctly) and all
sorts of problems started popping up :-(.

To get around all that, I have all of my printers that are not on my
desk (3 on the desk) connected to lan. Those printers are on a
different level in the building so running parallel cables was no
option at all. Serial wasn't an option either - 1 is a color laser,
1 is a high-speed duplexing laser, and the other is the ink jet
plotter. The two lasers require a substantial amount of data
transfer.

Chris



--- In Electronics_101@..., "Stefan Trethan"
<stefan_trethan@...> wrote:

Just learnt the hard way there really isn't much more in it than 5

meters.

9 or 10 meters did not work any more, so don't even try it, even

with the

old slow USB.

Solved the problem by putting the HUB in between. Not nice, not

what i

would have preferred, but works.

PS2 had no problem with 10m total.

I guess there is no point in even trying to run the LPT for 8 or

9

meters...

Strangely it seems i extended that USB camera with some simple

phone cable

for at least 10 meters and it still works nicely, but the hub is

not

recognized any more.

ST

Hi Guys,

Having lost enough hair trying to get i2C working with BASCOM, I
dropped it and switched to the SPI interface. Got that working
within a couple of minutes as opposed to countless hours getting
nowhere with i2C.

Anyway, being new to SPI, I don't know what the limitations are for
it. I would like to have the SPI master in a sepperate cabinet from
some of the SPI slaves. I am guessing the total cable length would
be about 3 feet - shielded cable if that maters.

I will try a test on the breadboard (yes, I am doing this on a
breadboard :-)). But I would also like to hear if there are any
cautions etc.

Thanks guys

Chris

A very knowledgeable person has suggested that I uses a CMOS binary counter
to set up a circuit used to test my SMPS.

I need to take a look at Digi-Key or Mouser and select a binary counter.

I think your basic commodity grade might work.

Any favorite IC's ?

I am working with 80kHz signal if that is a selection factor.

I will read up on the use of these things but if you guys are using these
you might know what is reliable item.

Thanks,

Dan Nicoson