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Sunday 08 November 2009

Connecting your laptop to your TV (make your own SVideo to RCA cable)

I have a laptop with an S-Video output and I wanted to watch a DVD on my TV (that didn’t have an S-Video input), so I decided to make my own cable – the ones in the shops were over R150. 
See below for the wiring – you’ll need a ceramic capacitor in the wiring.
I thought that the S-Video plug would “carry” video signal and the audio – I was wrong – I needed 2 cables: 1 for the video and another for audio.
image {Thanks to www.allpinouts.org for the images and diagrams pasted below – I wish I had them when I made my cables!}

Video cable:

Here’s an S-Video plug: image (plugged into the laptop’s S-Video output, and the TV end soldered onto a RCA jack and plugged into the video-in socket on the TV)

Here’s the RCA plug: image  

Here’s the wiring of the S-Video to RCA cable:
image

Pin S-Video

Description Pin RCA
1 Ground (Y) Ground
2 Ground (C) Ground
3 Y - Intensity (Luminance) Signal
4 C - Colour (Chrominance) Signal through 470pF Ceramic Capacitor
Notes:
  • Larger capacitor values will also work, but cause picture to become "softer".
  • The impedances and signal levels not matched exactly right, but near enough to work acceptably.

Audio cable:
The audio cable had a small stereo jack on it and plugged into the laptop’s headphone jack, and the TV end had two RCA male connectors and plugged into the audio-in (“Left and Right”) sockets on the TV.

www.allpinouts.org
While investigating this article I Googled into www.allpinouts.org which is an absolute mine of valuable information regarding pinouts of cables and connectors for all sorts of devices.  If you need to know how to wire up a connector or cable, then www.allpinouts.org will be your last stop!




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