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vga to composite sync -converter ??

#1 User is offline   smartdig

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Posted 13 October 2005 - 06:05 PM

hi,

i am using asus a7v400-mx click! board. it uses Integrated VIA UniChrome Graphics vga onboard controller.
i have a sony 18 inch tv. but it uses only composit video input.

i need any diagrams for vga to composite sync -converter.
i have some diagrams but its video quality is not good. i need profesional diagram of vga to composite sync -converter and been video quality best !!!!
price no any problem !!! i want best video quality.

and i am using debian linux.

may you inform me ?

regards
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#2 User is offline   Edster

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Posted 14 October 2005 - 11:12 AM

They are very very different types of signal. You will always have a bad signal if you convert them. This is really not the way to go.
Can you add on a new video card ? If so get one with TV out.
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#3 User is offline   smartdig

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Posted 14 October 2005 - 12:13 PM

View PostEdster, on Oct 14 2005, 11:12 AM, said:

They are very very different types of signal. You will always have a bad signal if you convert them. This is really not the way to go.
Can you add on a new video card ? If so get one with TV out.


no way with any scheme like this ? Posted Image

regards..
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#4 User is offline   Edster

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Posted 14 October 2005 - 01:31 PM

Maybe I read your first post wrong. The circuit above will feed into a monitor or tv with seperate R,G,B and Sync BNC inputs. The above circuit will work for that sort of input. I thought you wanted to combine them and put them all into one composite video port (a little yellow plug with just 2 connectors).

Check the spec of your tv before you build the circuit. If it has multi BNCs on the back it will normally work with just a H-Sync or V-Sync signal so you should get away without combining them.
A fully wired lead like this should be just 10 USD or so.
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#5 User is offline   smartdig

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Posted 14 October 2005 - 03:21 PM

View PostEdster, on Oct 14 2005, 01:31 PM, said:

Maybe I read your first post wrong. The circuit above will feed into a monitor or tv with seperate R,G,B and Sync BNC inputs. The above circuit will work for that sort of input. I thought you wanted to combine them and put them all into one composite video port (a little yellow plug with just 2 connectors).

Check the spec of your tv before you build the circuit. If it has multi BNCs on the back it will normally work with just a H-Sync or V-Sync signal so you should get away without combining them.
A fully wired lead like this should be just 10 USD or so.


first off all , thank you for your supports. and excuse me for my bad english...

my tv has scart connector. no bnc or rca.... i think it uses yuv vidoe type.
can i use that scheme or i need some modification on it for scart cable connection ?
and that scheme has give to my tv good quality video ? or do you have better ones ?

regards
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#6 User is offline   Edster

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Posted 14 October 2005 - 03:44 PM

A quick google turned up :
http://www.electroni...rojects/pc/012/

This is a very similar diagram to the one you were looking at so it is probably the same site.
The place this may not be good is the resolution. The VGA socket will be putting out a standard PC resolution. 640x480 or 1024x768 or something similar to that.
The TV is not expecting that. It is looking for standard TV size screens to come in through the scart port.
Some TVs will cope with it. Some will not.
If it does not you can tweak your computers resolution to TV size and this may or may not work.
This is not an easy thing to say if it will work or not. You need to try it and see what you get.
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#7 User is offline   smartdig

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Posted 14 October 2005 - 03:51 PM

View PostEdster, on Oct 14 2005, 03:44 PM, said:

A quick google turned up :
http://www.electroni...rojects/pc/012/

This is a very similar diagram to the one you were looking at so it is probably the same site.
The place this may not be good is the resolution. The VGA socket will be putting out a standard PC resolution. 640x480 or 1024x768 or something similar to that.
The TV is not expecting that. It is looking for standard TV size screens to come in through the scart port.
Some TVs will cope with it. Some will not.
If it does not you can tweak your computers resolution to TV size and this may or may not work.
This is not an easy thing to say if it will work or not. You need to try it and see what you get.


thanks a lot.....
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#8 User is offline   smartdig

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Posted 15 October 2005 - 02:23 PM

i found another 21 inch sony tv. its pal/g and uses standart audio-video input and rgb input with scart cable.
do you advise your scheme ? or another one ? i want good video quality.

regards
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#9 User is offline   Edster

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Posted 01 November 2005 - 09:27 AM

Quote

do you advise [bold]your[/bold] scheme ? or another one ?


I just want to point out that this is not my scheme :)
Have a look at the web site it is on if you want more details about what it does.

I still say if you convert from vga to composite etc you will not have a perfect picture. You may get a very good picture. but it will never be perfect as you are converting between different formats.
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