I recently bought a COLORDUINO, and I find it very nice.
and here you can find schematics both from the whole board, and from the led driver chip itself:http://iteadstudio.com/produce/colorduino-schematic-and-demo-code/
as there is no common ground, but both ground and positive are switched on and off by the controller
Maybe something with NPN transistor on the 8 Vcc pin(LED's common anode), and PNP transistor for the 24 RGB pin?
How is this for you? I only get a PDF file with squares and lines on it. No part numbers, no pin numbers, no IC signal names. It could be the schematic for anything. I am running a Mac so it might be an odd sort of Widows PDF.
Quoteas there is no common ground, but both ground and positive are switched on and off by the controllerYes that is how a matrix works. See my page:-http://www.thebox.myzen.co.uk/Workshop/LED_Matrix.html
QuoteMaybe something with NPN transistor on the 8 Vcc pin(LED's common anode), and PNP transistor for the 24 RGB pin?It is not as simple as that because you need something to limit the current through the LED. A resistor will not cut it for a 1W LED because the forward voltage drop of these is not stable. Therefore you need something like a constant current supply to limit the current as well as hefty drivers. FETs will be better than transistors at these values.
anyway you think something like this could work?http://www.sparkfun.com/products/10213
my LED modules already have an internal resistor in order to make them work with 12V,
well, it's not the best diagram I have ever seen, but still you can get an idea of the schematic
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.
Quotemy 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?
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.
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