A CCD (not a CDD) is a Charge Coupled Device, sort of an electronic bucket brigade. The charge on a capacitive cell is shifted into the adjacent cell on a clock transition. At the end of the "brigade" the charge on the last device is buffered and presented to the outside world. CCD's are used for audio delay lines, and as this thread refers to, video detectors. This works because the charge on a cell can be modulated by light falling on it through a window on the chip, then the charges on all cells are clocked out through the output buffer. When the entire image is clocked out, the image is captured again and the process starts over for each frame. CIAO - Martin. On Tue, 24 Feb 1998 12:44:38 GMT, FRAK!FRAK!FRAK! wrote: >excuse my ignorance ppl, but what is a CDD? > > > > Rock On......... > > >@>@>@>@>@>@>@>@>@>@>@>@>@>@>@>@>@ > !! FRAK MAN !! > !! The String Bender !! > !! email: frak@snakebite.com !! > !! Tel: 0161 248 5933 !! > !! IP No: 130.88.189.11 !! > @<@<@<@<@<@<@<@<@<@<@<@<@<@<@<@<@< > Martin R. Green elimar@NOSPAMbigfoot.com To reply, remove the NOSPAM from the return address. Stamp out SPAM everywhere!!!