9 Jun
2006
9 Jun
'06
6:18 a.m.
On Thu, 8 Jun 2006 20:22:42 +0100 (BST),
If you think how a CCD basically works, it has a series of electrodes
(normally 3 or 4 'phase' drive) on the surface of the chip, by
sequencing
the votlages on these electrodes, you move the accumulated charge
along.
Charge transfer actually occurs as the voltages are changing, which
means
the rise/fall time, and to a lesser extent the shape of the
rising/falling edge matters. Too steep can be a problem. I spent
many a
late night looking at the 'scope and adding low-value series
resistors to
slow things down a bit.
Alas, the world has moved on : check out <http://
pdf1.alldatasheet.com/datasheet-pdf/view/47490/SONY/ILX508A.html>gt;.
The clock generators are built in - you input a read-out gate, and a
clock to move things around. There is a sample-and-hold (built in).
Nothing really critical like in the old days playing with Reticon
sensors. I ran across a bunch of 2088 pixel chips and had one beast
running in less than 15 minutes... These sensors are over 10 yo.
CRC
ard at p850ug1.demon.co.uk (Tony Duell) wrote:
I would
assume it's a linear (as opposed to area) CCD. Now, I
spent many
years playing tricks with CCDs, and one thing that's burnt into
my memory
is that the drive pulses are critical. Not mild;y critical, but
_very_
critical.
OK, scratch that idea, then :-) 
13 Jun
13 Jun
9:59 p.m.
On Friday 09 June 2006 02:18 am, CRC wrote:
Alas, the world has moved on : check out <http://
pdf1.alldatasheet.com/datasheet-pdf/view/47490/SONY/ILX508A.html>gt;.
The clock generators are built in - you input a read-out gate, and a
clock to move things around. There is a sample-and-hold (built in).
Nothing really critical like in the old days playing with Reticon
sensors. I ran across a bunch of 2088 pixel chips and had one beast
running in less than 15 minutes... These sensors are over 10 yo.
I stopped using alldatasheet.com when they started "branding" their datasheets
with a page (!) added to the end of each one saying where it'd been
downloaded from. Where the heck do they get off doing that?! Wasting my
download time, my disk space...
There are other sites out there that don't do this.
--
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
14 Jun
14 Jun
5:04 a.m.
I stopped using alldatasheet.com when they started
"branding" their
datasheets
with a page (!) added to the end of each one saying
where it'd been
downloaded from. Where the heck do they get off doing that?! Wasting my
download time, my disk space...
There are other sites out there that don't do this.
Lemesee...some nice guys set up a system which stores some thousands (or
milions) of datasheets, index it, make it avaiable on the net, pay for the
band use...and just add one page to the datasheet, and you complain?
How much did you paid for the service?
Greetings from Brazil
Alexandre Souza, always grateful of www.alldatasheet.com ,
www.datasheetarchive.com and others who asks no money but a bit of attention
for something so valuable.
5:29 a.m.
On Wednesday 14 June 2006 01:04 am, Alexandre Souza wrote:
Yup!
I stopped
using alldatasheet.com when they started "branding" their
datasheets with a page (!) added to the end of each one saying where it'd
been downloaded from. Where the heck do they get off doing that?!
Wasting my download time, my disk space...
There are other sites out there that don't do this.
Lemesee...some nice guys set up a system which stores some thousands
(or milions) of datasheets, index it, make it avaiable on the net, pay for
the band use...and just add one page to the datasheet, and you complain? How much did you paid for the service?
Greetings from Brazil
Alexandre Souza, always grateful of www.alldatasheet.com ,
www.datasheetarchive.com and others who asks no money but a bit of
attention for something so valuable.
I think it's datasheetarchive (though I'm tired at the moment and it could be
a different one) that offers both "branded" and what they call
"commercial-free" downloads, though you're limited to so many a day of the
latter category. Other places don't do this at all.
And I don't *think* that I have any of those branded sheets up on my parts
pages...
(http://www.classiccmp.org/rtellason/parts-index.html if you're curious.)
--
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
1:11 p.m.
At 12:04 AM 6/14/2006, Alexandre Souza wrote:
Lemesee...some nice guys set up a system which
stores some thousands (or
milions) of datasheets, index it, make it avaiable on the net, pay for the
band use...and just add one page to the datasheet, and you complain?
He forgot to complain about the download speed, too. :-)
- John
1:46 p.m.
On Wednesday 14 June 2006 09:11 am, John Foust wrote:
At 12:04 AM 6/14/2006, Alexandre Souza wrote:
That's because the bottleneck on the download speed was on my end...
Though of course there's the point of getting to where you can actually
download something, and the point about them "naming" all of the stuff the
same (as in "datasheet.pdf" or whatever), so that you gotta tell it what you
wanna name it, etc. I like my setup much better -- it's way simpler. :-)
--
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
Lemesee...some nice guys set up a system which
stores some thousands
(or milions) of datasheets, index it, make it avaiable on the net, pay
for the band use...and just add one page to the datasheet, and you
complain?
He forgot to complain about the download speed, too. :-) 
11:03 a.m.
Roy J. Tellason wrote:
I stopped using alldatasheet.com when they started
"branding" their datasheets
with a page (!) added to the end of each one saying where it'd been
downloaded from. Where the heck do they get off doing that?! Wasting my
download time, my disk space...
There are other sites out there that don't do this.
I agree it's irritating, but sometimes such sites are the only ones that carry
the datasheet you need - I'm certainly not going to complain at an extra page
if it means I can have the datasheet at all.
It *might* be useful having a record of which site a datasheet came from,
anyway, in case at a later date other sheets from the same IC family are
needed. Too often I find myself needing to refer to related information of
some info that I already have (that may be several years old), and find myself
having no clue where I actually got the original from!
These cover sheets tend to be pretty much form pages - free from noise and
highly compressible. I doubt they add much to the total download size at all
(I'd check, but I can't be bothered going through my downloaded datasheets to
find one with the cover sheet :-)
Can't do much about the bandwidth, but you can always strip the cover sheet
out of the downloaded PDF if it's that much of a problem.
cheers
Jules
10:54 a.m.
On Wednesday 14 June 2006 07:03 am, Jules Richardson wrote:
Roy J. Tellason wrote:
True. But I'm still working my way through that, and finding out...
I stopped using alldatasheet.com when they
started "branding" their
datasheets with a page (!) added to the end of each one saying where it'd
been downloaded from. Where the heck do they get off doing that?!
Wasting my download time, my disk space...
There are other sites out there that don't do this.
I agree it's irritating, but sometimes such sites are the only ones that
carry the datasheet you need - I'm certainly not going to complain at an
extra page if it means I can have the datasheet at all. It *might* be useful having a record of which site a
datasheet came from,
anyway, in case at a later date other sheets from the same IC family are
needed. Too often I find myself needing to refer to related information of
some info that I already have (that may be several years old), and find
myself having no clue where I actually got the original from!
I don't really have any record of where I got most of the datasheets that I
have on hand here, some of the sites I've used aren't around any more (Dial
Electronics for one, which now refers to you to someplace else), and having
been collecting these for a couple of years it's a bit late for me to want to
start. :-)
These cover sheets tend to be pretty much form pages -
free from noise and
highly compressible. I doubt they add much to the total download size at
all (I'd check, but I can't be bothered going through my downloaded
datasheets to find one with the cover sheet :-)
I did take note of the fact that a great many of the ones that I had that were
branded were between 5-10K larger in size than the ones that weren't, though
some of the replacements were actually larger (maybe 1 in 20 or so).
Can't do much about the bandwidth, but you can
always strip the cover sheet
out of the downloaded PDF if it's that much of a problem.
What tools would you use to do this? I did get a hold of a package that
should let me do that, and may look into it if it gets to the point where I
can't find any replacements, but that's also an awful lot of time to spend.
And at this point there ain't enough hours in a day...
--
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
4:32 p.m.
On 6/14/2006 at 6:54 AM Roy J. Tellason wrote:
What tools would you use to do this? I did get a hold
of a package that
should let me do that, and may look into it if it gets to the point where
I can't find any replacements, but that's also an awful lot of time to
spend. And at this point there ain't enough hours in a day...
Ghostscript+GSView, both available free on the web. Lots of other
interesting conversions, such as PS->GIF (for OCR scanning). If you use GS
and the redirection tool on Windoze as a printer, making PDFs turns out to
be child's play.
Cheers,
Chuck
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