Rca To Vga Converter Circuit Diagram

1. Build a circuit that will convert a composite signal to a VGA signal. What I want to do is be able to watch TV on a LCD monitor, with out buying an expensive converter or expensive monitor with a composite in. I was wondering if someone could point me to a schematic for a circuit to make this conversion. I've found many circuits that convert VGA to.
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Index

General introduction to VGA to TV conversion

Natually the computer graphics (VGA) and normal broadcast television(NTSC,PAL or SECAM standard) are very incomatible with each other.With suitable conversion it is possible to show VGA picture onTV screen with somewhat degraded quality. This conversion can be donewith some external hardware or the conversion hardware can be builtinto the graphics cards (PC graphcis cards with TV output option).

Normal video signals you watch on TV screen are generally in compositevideo or RF (antenna). The picture signal sent out by PC graphics cards(VGA, SuperVGA and newer cards) is analogue RGB signal with separatgesync signals. The picture resolutions vary from computer (typically from640x480 well above 1024x768) and the broadcast television (nominally525 or 625 lines in Y direction isn signal, somewhat less visible,resolution in X direction not absolutely defined, usually effectiveX resolution beteen 300-600 pixels). The picture format used inbroadcast TV is interlaces but computer uses non-interlaced ivdeo.And the picture format sync rates are different.The HSYNC rate of TV is 15625 Hz (for PAL and SECAM standards) or 15750 Hz (for NTSC standard). The VSYNC rate is 50 Hz (for PAL and SECAM) or 60 Hz (for NTSC). Original VGA used around 31 KHz HSYNC rate and 60-70 Hz frame rate, nowadays typical values are HSYNC=30-65 kHz and VSYNC=50-120 Hz.

This means that there are lots of conversions involved to do thecomvbersion. But it is definately doable becaus there are products forit. But be warned that the conversion is not easy (although in somespecial cases it can be done quite easily).

When displaying computer graphics on TV screen you will very easily seethe limitations of the TV itself and the TV broadcast standards.Anybody who has tried to display computer graphics on a television knows that they look bad. Colors wash out, detail is lost, and the whole thing flickers. And that's the best scenarios. Sometimes the graphics really get distorted. While everyone knows that televisions do bad things to computer graphics, few people are sure exactly what is happening.This confusion isn't surprising. NTSC and PAL encoding are quite complex, and the reasons that they distort graphics are not always obvious.This document tries to clear out some details of the conversionsneeded to display graphics from PC on TV screen.

VGA to TV technology information section

Technology information

• Savage3D TV Out - A Tutorial on Graphics to Television Conversion from S3
• SkyVision BOX-800 described - decribed how two commercial VGA to TV converters work

Articles and buyers' guides

• Scan Converter Buyers' Guide - short guide
• Scan Converters Buyers' Guide - full book in pdf format
• Scan Converter Homepage - scan converter article and information on scan converter wiring in TV production
• Scanning The Scanners - article about scan converters
• Setting Up a Scan Conver - Properly setting up a scan converter can make all the difference in the world in respect to image quality
• Ten Questions You Should Ask Before Buying a Computer to Video Scan Converter - pdf file from Black Box

Product lists

• Ruel's PC-TV Net Page - huge list of links to commercial VGA to TV conversion products

Converter connections

• 100 Hz TVs with direct VGA input - some new TVs can accept VGA signals directly without conversion

Tips

• The Fansubbing FAQ - what cards to use to add texts to videos

VGA to TV converter building information

You might be in this page because of my VGA to TV converter circuit.The information about that converter has not it's own index pageso please go there if you are interrested in my limited functionality VGA to TV conversioncircuit. Main characteristics of my design:

• Works only with TVs which have SCART connector in them
• Needs drivers to operate and you need experimenting to get them to work
• Drivers only available for limited set of VGA chipsets for DOS, Windows and Linux Xfree86
• Very sharp picture to TV but does not have flicker fixer
• Does not work correctly with some TVs and graphics cards
• You have to build the circuit yourself, no ready made unit or kit version available

There is also a descripion of the circuit in Finnish.

Other VGA to TV project pages

• Costruisci un convertitore VGA to SCART - very simple VGA to SCART circuit and a driver for it, text in Italian but you can try automatic translation to English by AltaVista Babelfish
• Coelho's VGATV Homepage - DOS/Windows (S)VGA to TV/Video driver utility for Paulo Coelho's VGA to TV circuit which gives out PAL composite video signal

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