1.Yes. USB only supplies 500mA. DO NOT connect you LED Anodes to power them.
- Up to about 12V. More than that and the U1 regulator may get pretty (quite) warm. That's why I suggested 7.5V.
ok lasts questions 
- im not sure what did u mean with this-
DO NOT connect you LED Anodes to power them
- again about the NPN, i found some cheaper one's and i want to be sure they gonna be suitable:
http://www.taydaelectronics.com/ktc3202-transistor-npn-30v-0-5a-to-92-ktc3202y-at.html
-Just to make sure, (and to expirience the software ) this is how i am gonna connect everything:
the 9V battery is insted of the ac/dc adapter-couldn't find it in the software
http://sphotos-g.ak.fbcdn.net/hphotos-ak-ash4/s720x720/418525_4403553004146_1268536174_n.jpg
by the way if anyone interested this is the software: http://fritzing.org/ its realy easy and u can do sketch/prefboard as well
than?ss :))
I meant do not connect your common Anode to 5V on the arduino to power. You will need up to 600mA if all LEDs are on, and USB can only supply 500mA.
I don't care for fritzing. Cannot tell what is hooked up - for instance, which the Base-Emitter-Collector pins on the transistors?
Which is the anode on the LED? Is the middle resistor connected on its right side?
I'll take a real schematic anyday.
ok sorry. what software did u use to make the sketch?
-can you please approve the transistors...?
- i got to the conclusion that im gonna do this project and use an atmega328 on a prefboard - like here: http://arduino.cc/en/Main/Standalone
so, i just wanna be sure that its gonna be ok to connect an ac/dc adapter (7-12V) straight to it
thanx
The first & third are adequate.
2nd & 4th are too low in current capability. (0.5A).
I use expresspcb.com to make schematics for posting here.
7-12V adapter will have to be regulated by 7805 type regulator.
oh i thought that NPN with 0.5A collector current will be ok because we r using only 0.2A. so i gusse the bigger the margin the better.
- and yes, by the link i posted (http://arduino.cc/en/Main/Standalone) the r using an 7805 regulator for power supply.
CrossRoads Thank you very much, you helped me a lot and i learned a lot ! thanks for the patience
I thought you needed 600mA - I might have posts mixed up.
If you only need 200mA they should all work.
Let us know how the project goes...
each transistor need 200mA, thats mean 3x200=600mA (your calculate haha)
i will let you know when i finish, now i need to order everything...