Sv: RE: [sdiy] Video-synth DIY ?

[Daniel Araya]

I found this document about replacing the SAA1043 with a more modern
component:
http://www.web-ee.com/Electronic-Projects/data/saa1043_to_saa1101.pdf

/d

>>> Metrophage <c0r3dump23 at yahoo.com> 2005-06-28 23:56:24 >>>
--- "Metzger, Michael A" <MAMETZGER at partners.org> wrote:

> Wow - look at all the responses. Contrast this with my similar
> inquiry a couple years ago. I either got one reply or none, 
> can't remember!

Indeed, I am surprised! You see, we weren't the only people here who
were thinking about video synthesis!

> So, CJ Metrophage, you're not going to believe this but.....I have
> the schematics and assembly instructions for the Sandin Image 
> Processor. That's the good news. 

Wonderful! I had read that those were out there, I was hoping that
they
weren't all collecting dust with abandoned video synths in some attics
somewhere. I certainly hope I can check them out sometime.

> The bad news is that they are in storage and I probably won't 
> be able to get at them until September. 

I know how that can be... half of my stuff is in storage near my
parents place. No video schematics there, though.

> Since it was designed a long time ago all the parts are 
> obsolete. But the circuits could, of course, be redesigned
> using modern components. (fun with surface mount!) IIRC 
> there's also a note from Dan Sandin with the schematics 
> that gives people the go-ahead to build the modules for 
> non-commercial use. I'll check that when I get the schematics.

I am sure we are all used to electronic components going by the
wayside. OTOH a lot of interesting new ones do come along. I'd love to
see some video synth schematics mostly to get an idea of the details
of
how it all fits together, I didn't assume that there would be any I'd
reproduce exactly. I have learned a bit from going over audio synth
schematics, I expect the same applies here. It's cool he encourages
their use, it keeps his legacy alive. Sad to see some obscure gear and
software is still secret decades later after the commercial potential
has long since gone

> As for the circuits themselves, I don't remember details on the
> Sandin IP modules. But they all feed into an analog color 
> encoder. The encoder outputs the PAL & NTSC signals. You 
> could get an encoder and feed it various signals. That's what 
> was done in this magazine article
> http://www.audiovisualizers.com/library/store/TVFX 
> The TEA2000 & SAA1043 chips are no longer produced.  And 
> when you analyze that circuit you'll see its rather basic anyway. 
> You could probably make something more interesting in
> short order.

It seems that a lot of artists mentioned on their pages used video
encoders from old camera PCBs. Thanks for the article link, it is more
basic than I am thinking of but is not a bad starting point, idea
wise.

> Here are AD's color encoders. I think only the first 3 accept analog
> input.
>
http://www.analog.com/en/subCat/0,2879,765%5F798%5F0%5F%5F0%5F,00.html

>  
> Or you could get one of the digital encoders and feed it
> random/rhythmic/whatever digital pulses.

True. Appears they offer decoders as well. And of course ICs for fast
VCAs and multipliers. Off to eat dinner and meditate on these...

CJ


		
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