ard at p850ug1.demon.co.uk
Thu Jun 8 14:22:42 CDT 2006
> > 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 :-)
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.
> > Anyway, there is the other problem that if I do get the scanner, what the
> > heck do I store the data from it on. I am not using multiple 8" disks per
> > page :-)
> You know, I did almost raise that question - but I figured that you've
> probably got some old mini laying around with a reasonably large-capacity
> full-height SCSI disk in it :-)
My minis have RK05s and the like. 2,5M on a pack is not a lot of use for
this. OK, I have a couple of RK07s, but they're 'only' 28MBytes, and I
don't have that many packs for them (enough to use, bot enough to use for
> > Do you know of a CD burner that comes with a service manual?
> For starters I'd want to be able to trust CDs as a good storage medium, so
> let's not go there ;)
No, but I am told CD-ROMs are useful for sending said scanned manuals to
places like Bitsacers.
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