"LS" said:
Hi,
I have one OLD CCD camera JVC TK-850E for microscope.
On the rear there are two connectors:
1) BNC DC IN/VIDEO OUT
2) AUTOIRIS with three holes 1 GND 2 VIDEO 3 DC IN
The DC is 14.5V 9.3W
How I make the dc connection and use the video camera with my pc ? tha
The only reference I can find to the product on the web,
is for a service manual. The JVC site doesn't mention a
user manual, and that tells me that the camera you have,
is part of some bigger kit. Perhaps the kit includes
a power source. JVC does sell cameras separately, so
the fact that there isn't a user manual for your camera,
suggests you don't buy that camera as a separate end-user
part.
If the camera has a separate DC-IN connector, you can
find a power supply at your local electronics store. The
two cameras I own, take 12VDC, and I hooked an unregulated
"brick" to a 7812 regulator IC and made my own regulated
supply. Each camera will have a different spec, and may
use regulated or unregulated power, somewhere between 12VDC
and 24VDC.
If the camera _only_ has a BNC connector, and it said
"DC IN/VIDEO OUT" next to it, that could spell trouble.
There is a technique for sending power-over-coax, such
as this:
http://www.edn.com/archives/1997/092597/20di_01.htm
I'm not showing you that page, to suggest you build the
circuit. That page shows you would need a special box
at the end of the coax, to separate the DC power from
the video signal.
So I sure hope your camera has a DC power connector _and_
a BNC video connector. If it does, the camera hook up will
be a lot easier.
A cheap tuner card, with a BT848/BT878, will get you a
picture, like 640x480 in recording mode. Hauppauge makes
these as "Win-TV" cards, but there are many other small
companies making stuff like that. But to use that tuner
card, you need to have a video only connector on the camera,
as if the BNC carries video and power, the video and power
have to be separated, before the video signal can be used.
Note - if you operate the BT848/BT878 card in a "snapshot"
mode, which is what you would want for a microscope, take
several pictures in a row, then "average" the pictures
together. You can do that in Photoshop (for two pictures),
or cook up your own recipe using the primitives in PBMplus.
I find that averaging just two pictures of the same still
object together, measurably improves the video noise problem.
Try to contact someone at JVC, and see if they can tell
you a little more about the camera.
Just a guess,
Paul
