Following the example by lady ada here: http://www.ladyada.net/products/rgbledstrip/Using the STP16NF06 as suggested, wired properly, with a TLC 5940 driving them commanded by an arduino, nothing happens unless I hold the PCB in my hands. simply touching the pins of the mosfets, while a fade is running, turns them on until the fade completes (I can let go as soon as everything lights up). The RGB LED's stay dark until I touch the mosfets with dry, bare hands again. NOTE, I did not install the 10k resistors (yet) that I have seen in other depictions, but aren't those to make the mosfets turn back off? My current limiting resistor (IREF) on the TLC5940 is a 2.2k.
(I can let go as soon as everything lights up)
The other thing is that the TLC5940 just pulls down so you need a pull up to 5V or more to drive the FETs.
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