OT: transparency adapter
I'm on my knees to beg for forgiveness for this off-topic subject.
My father wants to scan some slides with this trusty HP scanner. Needless
to say there is no adapter for that particular type of scanner, so we
decided to build something ourselves. We tried many different kinds of
regular and fluorescent bulbs in a homemade cover which we placed over the
slide. The picture comes out fine, only the colors never match (not even
GIMP can correct this).
We just got hold of an old ISA (?) scanner (US$7 at a fair) and the idea
was to rip out the bulb and simply connect it to a power supply. From the
electronics we could deduct that the bulb runs on AC power (it looks like
the DC is coming from the ISA card, runs through a flip-flop consisting of
two transistors and then is transformed with a small transformer before
going to the bulb). We don't have a clue as to what voltage to use and the
thing came without ISA card so there is no way of checking when the scanner
is in operation.
Any of you have experience/know something more about this? What voltage do
these scanner lamps run on? Anybody ever tried to make a transparency
adapter? Any hints highly appreciated. Thank you. --hans