I would like to use a common cathode RGB led in my linkit one, but I only found 20mA led. The linkit one has digital pins with a maximum current of 3mA. I thought of using a 2N3906 pnp transistor in order to create a current amplification that allows me to use the LED without damaging the board. In the picture there is the circuit. I only need the colors red and green. Will it work?