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I'm interested in building a composite to scart adapter.

How can I?

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  • \$\begingroup\$ Don't. SCART is the worst connector ever designed. You should block any ports with a warning label. \$\endgroup\$
    – pipe
    Apr 28 '20 at 8:55
  • \$\begingroup\$ Composite signal is already a part of SCART Pin 20 is composite signal and 17 is composite ground. \$\endgroup\$
    – winny
    Apr 28 '20 at 10:58
  • \$\begingroup\$ @pipe Nonsense! SCART is awesome. \$\endgroup\$
    – winny
    Apr 28 '20 at 10:58
  • \$\begingroup\$ @winny: SCART functionality was awesome back in the day. The connectors themselves were crap. I've got several leftovers laying around here where the housing broke or the wires got bent and broken. \$\endgroup\$
    – JRE
    Apr 28 '20 at 13:39
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Looking at the SCART pinout you either use pin 17&19 for Scart to composite or 18&20 for composite to SCART.

I assume you are using a RCA jack for composite, thus the ring of it would be GND and the tip the signal.

Scart Pinout

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  • \$\begingroup\$ Another question:does a modern lcd tv that support scart support this way of "injecting"composite?This tv doesnt have a composite in. \$\endgroup\$
    – TechTheGuy
    Apr 28 '20 at 9:27
  • \$\begingroup\$ Its essentially the same signal but in a different connector. Thou you may run into problems if you try to mix NTSC or PAL but that's a different story. \$\endgroup\$
    – user158029
    Apr 28 '20 at 10:00
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Scart includes connections for composite video.

All you have to do is to wire your composite video signal to pin 20 and the ground of your composite signal to pin 17.

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