That will work for one of the FETs, the one that pulls down, it is an N-channel one. You will also need a P-channel FET to source the power. As you want to drive 12V then the gate of this FET will have to be driven through a transistor or n-channel FET to get the 12V to 0V signal to turn it on and off.
ok, so, any suggestion for the p-channel fet?
my LED modules already have an internal resistor in order to make them work with 12V,
So again lack of information hampers a sensible reply. What LED have you got? Module, strip, component, just what?
as already said, I have led modules.
to better understand let's say it's something like these:http://led-modules.zapled.co.uk/rgb-led-full-colour-modules
but my question is about any 12V rgb led module, as the question here is not how much hefty the transistor must be , but how to connect it to a matrix driver.
No you can't it is total pants. It is dishonest of the person to put it up and I would have nothing to do with him if it were me. At least a complaint would be going in. I assume it is a crude attempt to stop anyone copying the design, but something like that is deplorable.
to be honest I don't know about iteadstudio.com policy, but maybe this is something we should discuss somewhere else.
I was just wondering how to have fun with this (and maybe any other) matrix cirucit board, if someone can help...