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  • Publicado : 11 de diciembre de 2010
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S-video to composite video adapter
This simple adapter can be used to convert Y/C video (S-video) to a composite video. This adapter is useful in cases where your video output device has onlyS-video output but your signal source accepts only composite video input. This circuit works with both PAL and NTSC video standards.
1-Y-ground----------------++---------- RCA/composite ground ------------------------( 0 )
2-C-ground----------------+ ||
3-Y-----------------------+ |+--------- RCA/composite video ----------------------------+
This circuit can bequite easily build inside a the S-video connector case if a physically small size 470 pF (ceramic) capacitor is used. Larger capacitor values will also work, but cause picture to become "softer". Thevoltage rating of capacitor can be 10V or more.
This circuit works in practice quite well even though the circuit operation is not ideal. This means that impedances and signal levels not matchedexactly right, but near enough to work accetably. The picture quality you get from this circuit is is good, but not as good as with best possible composite video output circuitry.
Here is the pinout ofthe S-video connector shown from the end with the FEMALE PINS (picture is a view on the equipment back/front panel):

1 Y ground
2 C ground
3 Y(luminance+sync)
4 C (crominance)
What if my PC graphics card has a 7-pin S-video connector instead of 4-pin ?
The four pin S-video connector as shown above is the standard...