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How to use SCART for our hobby

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Bluedeath:
RGB and S-Video shares the pinout the tv determines  if you are using RGB by the voltage that the SCART receive on a specific pin (the one in the schematics for the cable).

from wikipedia:

"Two pins provide switching signals.

Pin 8, the switch signal pin, carries a low frequency (less than 50 Hz) signal from the source that indicates the type of video present.

0 V–2 V means no signal, or internal bypass
4.5 V–7 V (nominal 6 V) means a widescreen (16:9) signal
9.5 V–12 V (nominal 12 V) means a normal (4:3) signal
Pin 16, the blanking signal pin, carries a signal from the source that indicates that the signal is either RGB or composite.

0 V–0.4 V means composite.
1 V–3 V (nominal 1 V) means RGB only.
The original specification defined pin 16 as a high frequency (up to 3 MHz) signal that blanked the composite video. The RGB inputs were always active and the signal 'punches holes' in the composite video. This could be used to overlay subtitles from an external Teletext decoder.

0 V–0.4 V means composite with a transparent RGB overlay.
1 V–3 V (nominal 1 V) RGB only.
There is no switching signal to indicate S-Video. Some TVs can auto-detect the presence of the S-Video signal but more commonly the S-Video input needs to be manually selected.

"

I suggest to use a 1.5v battery instead of the PC psu for RGB blanking.

Zebidee:

--- Quote from: Mr Kray on April 22, 2008, 11:31:02 pm ---I was told by a number of retailers including specialist importers that almost every TV in Australia - that isn't imported from Europe - with SCART doesn't actually have true RGB, the RGB pins are just hooked up to the composite (or maybe s-video) input. This is due to the TVs all being manufactured in the same factory but then shipped off to different places; so for Australia they use the casing for all over the world but just put in a dodgy SCART port that is really no more than composite or s-video.
Mr Kray

--- End quote ---

I can confirm that this story put-up by retailers is a lie - mostly.

I have run RGB through SCART to countless TVs in Australia.  In just one case was the SCART input only good for composite (ie not RGB).  That was a mega-cheap "Goldstar" brand TV.  Goldstar always was a cheap brand, and this experience confirmed that fact.

Regarding s-video through SCART - usually TVs that accept s-video through SCART have multiple SCART ports, with one dedicated to s-video.

lettuce:
So can u wire the scart plug up, so it can turn any TV set on when you power up the PC??

Zebidee:
No

Level42:

--- Quote from: lettuce on May 22, 2008, 01:41:55 pm ---So can u wire the scart plug up, so it can turn any TV set on when you power up the PC??

--- End quote ---
If you want to turn on the monitor with the rest of your cab simply put the mains connection of the TV behind the mains switch of your cab. I do it all the time. Then, because of the SCART selecting signals the TV will immediately switch to the SCART input.

Also there ARE TV's that will switch from stand-by to operating by these signals, but not all of them.

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