Alan B. Pearce wrote:
>
> >There certainly are video transformers.  We use them occasionally
> >at work when we need to DC isolate a video signal.

> OK it may be that the expectation is that the monitor will do the DC restore
> function anyway, and hence there is no attempt to do it with the
> transformer.
>
> IIRC the DC restoration is done by clamping the signal to ground during the
> sync pulse, so the worst case is that the transformer has to maintain a
> reasonably constant level signal for one line period. My TV & video theory
> is getting pretty rusty, but that is how I remember it.


It may be possible to just couple the video signal
through a series capacitor, eliminating the need for
the video transformer.
-Roman

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body