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video synth diy (vga)
MUFF WIGGLER Forum Index -> Video Synthesis  
Author video synth diy (vga)
old gregg
Hi

I've been interested in video synth for a long time and I decided to build my own but with VGA output (sort of, the colors are analog).

I'll post progress on my website under the "video circuit" title, with though and schematic

I must say that I'm already excited by the result I got from my poor breadboard and alligator clip set up. I'm only driving one color at the moment (just to see if things works with a cheap vga board from china for the sync signal that will be changed for a processor). Here are some picture at the begining of the process.





I've also recorded some videos that i'll put on youtube.

once the vco are frequency and amplitude modulated, things get (good) crazy.

Can't wait to have the tree colors and have the thing finished !!

If there's interest I can keep posting my progress in here. Maybe you guys would find interest in it ?

thanks to LZX industrie for all the informations they gave about blanking/sync signal and circuit design !
FetidEye
hi!
looks interesting!
I've been meaning to experiment with VGA signal synths for a while.
this will help!

your "video synth progress link does not work though. (404 error)
the images link also not.
old gregg
I've uploaded the missing page. It's ok now.

please let me know if you see any grammatical errors.

I'm currently thinking what kind of response the vco should have, linear or log. Also, thinking about cheap VCA circuit that can work with high-frequency.


evolve
Is this the CH/AV or something different? Looks cool!
old gregg
what is the Is this the CH/AV ?
vonkhades
old gregg wrote:
what is the Is this the CH/AV ?


https://jonasbers.com/chav/
old gregg
I'm using the same small VGA board for the sync generation while the circuit is on the breadboard.
evolve
So very similar design then! There is a lot of interest in the CH/AV as people are holding workshops to make them. I would suggest cruising the Video Circuits fb page as I know some people have posted their schematics there.
vonkhades
evolve wrote:
So very similar design then! There is a lot of interest in the CH/AV as people are holding workshops to make them. I would suggest cruising the Video Circuits fb page as I know some people have posted their schematics there.



That would be me, schematics are here https://github.com/ttreintaysiete/chaves

is still a work in progress.
old gregg
I'm using the vga board only for the prototyping stage, I've already worked on a processor based sync generator for the final design.

But for those who don't want to go that road, the vga board can be easily modified for having easy sync signals.
Marizu
This looks cool. I'd be interested in finding out more.
I'll have to take another look at my breadboard, but I did something similar but using a cheap video game to vga box to generate the sync.
This was an easy way to get video signals in from cheap cameras without having to worry about sync/genlock.
The signals could pass through or be patched.
I built a PLL oscillator that could sync.

Video In with oscillator on one channel
old gregg
thanks for your interest, at the moment I'm trying to figure out the right timing for the VGA.

I've worked on the PCB. I added a prototype area.


I've tried it yet, but it'll probably also work for PAL/NTSC video with the right sync.

you can find more information here :
http://rumorofsmoke.com/
https://hackaday.io/project/29965-vga-video-synth
i.m.klif
This looks like a nice project. I checked your post on Hackaday and it seems you have some rather specialised question related to video (like the choice of op-amps). There is a active community that knows this kind of stuf, with people eager to share the knowledge on two Facebook groups

https://www.facebook.com/groups/VIDEOCIRCUITS/

and

https://www.facebook.com/groups/lzxindustries/

imho they could give you some great tips considering your design.

Klif
old gregg


the boards arrived !

Ordered 5 received 9, I think I'll sell the ones I won't used once the boards is built and validated.

I added A small prototype area as I'm also working on a PAL video modifier.
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