[sdiy] OTA book on eBay

[Metrophage]

--- cheater cheater <cheater00 at gmail.com> wrote:

> TV Oscillascope for Visuals
> Goes to the Music. Just turn on the Raido and VUUALLA!

Does the guy offer a whole modified television for sale, or just
"plans"?

> these two lines have so many errors on so many levels I'm not even
> going to comment on all of that.

It is amazing how those few words of his have me laughing so hard.
Somebody get this guy some drugs, he's hallucinating!

> Wonder how the circuit works, though.
> It's not an oscillascope, rather than that, some crude visual
> firework... interesting...

Basically, it works only with older analog televisions. There are
onboard oscillators for the vertical and horizontal scan frequencies,
one can modulate or replace those with signals from an external source.
Oft used is the output of a stereo amp or preamp. There is a project
online called "Wobblevision" which shows in some detail. One needn't
dig very deeply to find descriptions of how to do this without
patronizing this sketchy eBayer. I am "scoping" local tag/garage/yard
sales for suitable televisions for a similar project.

Many of the very first video synthesizers were based on similar
approaches to scan modulation, then the screen output was usually
recorded with a video camera for further processing. Later, people
figured out how to modulate the scans inside of vidicon-based (tube)
video cameras so that the signals could be processed directly. I first
latched on to this idea in my late teens when I was lucky enough to
stumble onto a television special which showed excerpts from, among
other amazing things, Nam June Paik's "Global Groove" and "Suite 212"
which made excellent use of this technique.

There was a brainstorming session on the list earlier this year on
video-synth DIY which included a lot of interesting discussion. I've
made no video progress myself. I want to hit one of those Defense Dept
auctions and get a truckload of old video gear for $50 to play with. I
actually did so before but ten years ago I lost it all in a fire. The
landlord told me to leave all of the damaged things there for the
demolition people to handle... then months later he saw me on the
street and started yelling at me and chasing me for 1/4 mile because it
turned out that the heavy steel cabinets were a problem for them. I
felt badly for the guy. And I miss that old video gear, now that I know
what to do with it!

CJ


	
		
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