Xref: utzoo rec.photo:2266 rec.video:3241 sci.electronics:2686
Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!oberon!nunki.usc.edu!cyamamot
From: cyamamot@nunki.usc.edu (Cliff Yamamoto)
Newsgroups: rec.photo,rec.video,sci.electronics
Subject: Video inversion (build w/ chips, cheap sources of)
Message-ID: <637@nunki.usc.edu>
Date: 3 Apr 88 20:40:18 GMT
Reply-To: cyamamot@nunki.usc.edu (Cliff Yamamoto)
Distribution: na
Organization: University of Southern California, Los Angeles
Lines: 22
Keywords: chips, cheap boxes


Greetings A/V do-it-yourselfers,

    This circuit that I'm trying to build seems so simple, I'm surprised I
can't find anything on it.  I'm interested in building (or locating a cheap
source of) video inverters.  I've been searching through my IC ref books, but
most of the chips I see are for TV's and the like.  All I want it to do is
take a 75-ohm NTSC video signal w/ negative sync, invert the picture portion
on the signal while keeping all the sync, color burst, etc. intact, then
output it.  Essentially I'd like to use my color negatives and move them to
video by camera but invert all the color/luminance values.
    I went down to my local TV store(s) and I saw a gadget by Sony that 
(aaacckk!) went for $800.  It had this Neg/Pos switch but I don't need all
that computerized wiping and color correction junk.  If anyone can direct me
to a manufacturer (or a mag/book with a simple circuit) that can perform this
inexpensively (under $50) I'd appreciate it.

Thanx in adv!
--------------------
Clifford K. Yamamoto
ARPA:  cyamamot%nunki.usc.edu@oberon.usc.edu
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