Technology
Also the basics of the 740k modification are derived from the
great work of Steve Chambers
and the colleagues at QCUIAG
COPYRIGHT NOTICE! The inventor and author of the
basic idea of this modification is Steve Chambers. The author is asking that the information about modification is not used by others for personal gain. Any individuals or companies wishing to produce commercial products based on
the modifications shown on his website please contact him directly .
Basic work has been done by modifying a Vesta WebCam and the one
used is controlled by a Phillips SAA8115HL through a NEC
uPD16510 vertical CCD driver.
The basic 740k modification is available among others following the
links on Steve Chambers Web site http://home.clara.net/smunch/wwhich.htm
and I did follow the path of Ashley Roeckelein.
I used the same 4066 modification
that I had used for my Logitech cam.
For the AmpOff I used first the standard approach with a transistor disconnecting
the ground pin 9 while exposure - William Behrens presented his circuit
with a 6.2V Zener diode to limit the voltage to the CCD amp circuit while
exposure. This was starting point to my
current design.
An evaluation of this design can be found here
(240kB page)
A word of caution....
NO WARRANTY LEFT AFTER OPENING THE
HOUSING
Prepare your working area! Use ESD equipment.
Fasten the cam to something.
Handle the cam with care and always protect the CCD
surface.
I found the 740k mod a bit harder than the QC Pro 3000 mod as the NEC
chips seems to have smaller pins than the Logi Cam.
I removed the CCD before modifying the cam because I had to put it on a
peltier cooler. This makes the mod easier as you have full access to the
pin 13.
