Arduino Power Supply

Hello everyone,

I know that there should be an answer to this question, but i didn’t found anything related to this.

Here is a route, and i’m asking if it could be work or not. I mean, won’t it damage the arduino nano or his built in voltage regulator the high current. 12V 10A power supply for 6,4 meter RGB LED strip.
Should I use a pre-regulated 5V (with some kind of 7805 IC) just for the Arduino?

Thanks in advice.

Well, I think those 220 Ohm resistors you have in parallel with the transistors should be between the FET gates and the Arduino output pins, also, how much current are the conductors in the breadboard carrying? I don’t think they are rated for much. Otherwise, looks OK to me. The Arduino’s regulator should be fine with the low currents you are controlling.
wrong.png

I'd add some big decoupling on that 12V rail near the MOSFETs, 470uF would be nice, you are
switching a lot of current, you should have a lot of decoupling.

@outsider: Thanks but thoose resitors are 10k Ohm, just forget to change their value (color code also). Their function is to force the signal at LOW level until the arduino kicks in.
Also I won't use breadboard, just used to demonstrate the circuit.

@MarkT: What does "decoupling" exatly means? Can you show me some examples why a capacitor is needed?

What does "decoupling" exatly means? Can you show me some examples why a capacitor is needed?

Everything you need to know about decoupling:
http://www.murata.com/~/media/webrenewal/support/library/catalog/products/emc/emifil/c39e.ashx

And
Here also.

.

Mike has a page you might want to review.
http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html

.

Thank you all!