I searched for similar parts and found this http://uk.farnell.com/microchip/mcp1640t-i-chy/boost-regler-synchr-500khz-6sot23/dp/1800205 - far cheaper! Are both compareable? Keep in mind that i need 16*3 of those So i also need to care the price....
...the 4K7 resistor would also need...
...You don't need the 4k7 resistor...
This is what i planned (attachment) - i have to say that i didn't understand what i was drawing. How do you figuered out the 0.65v?
I will also need Common Cathode RGB Leds, right?
Did i calc the resistor the right way? It was like: "Oh, let's take 0.65V, gimme 350mA -> divide ==> 1,8 Ohm Resistor"
I still 'd like to know why the LM317 will not work
I hooked it up again (attachment). Could it be that there is a mistake in my first try from yesterday with the upper right transistor? Its emitter is facing to Vcc - this is wrong, isn't it?
Parallel i was looking for a part that provides many transistors in one package to make manifacturing easier, and i found this transistor array: http://www.fairchildsemi.com/ds/FF/FFB2907A.pdf
For the LM317 thing: i planned it in eagle and in comparison with the 2 transistor circuit the soldering effort will be the same (i was assuming that i need fewer parts when using the LM317)