I want to build an Arduino on a breadboard like it is described on the Arduino website:
but i am not sure if my power supply is really OK for that?!
I bought one with a DC output of 9V at 1000mA, is that really OK (in the description they wrote 9V is suitable but what is the "real world" experience?)
And I also have a second question appending to this topic, because with this Arduino I want to power up some LEDs (max. 25 at the same time) do I have to use transistors between the Arduino / shift registers and the LEDs or is it OK to connect them directly also in long term usage?
I hope that someone has some experience on that ^^ and thanks so far for any answer