Schaltplan - Verkabelung

[harryberlin]

it's important tgat the 3rd ring is ground. because there is no standard for 4pin 3.5mm jack.
most use 4th ring for ground. so you would have wrong video polarity and no ground for audio signal.

if you have ntsc wire you don't need gpio7 and the 100 Ohm resistor.
Ntsc can do the same. (pull down to enable video signal from raspberry)