# LED strip power supply

I have a 1m long strand of WS2812b LEDs with 144LEDs/m and I'm not sure what kind of power supply to use to power them all as it takes 8.64a max (all LEDs fully lit and at max brightness) but I don't know where or how to get a 5v, ~9a power supply because based on my limited knowledge of electronics and such, I won't be able to get more than 5a with a 5v power supply because of ohms law. I'm probably wrong about a lot of things so please please just correct me everywhere I am I'm just trying to learn this stuff and that helps a lot.

based on my limited knowledge of electronics and such, I won't be able to get more than 5a with a 5v power supply because of ohms law.

If you have less than 1 Ohm you can get more than 5A. ;)

Aode_Ward: I have a 1m long strand of WS2812b LEDs with 144LEDs/m and I'm not sure what kind of power supply to use to power them all as it takes 8.64a max (all LEDs fully lit and at max brightness) but I don't know where or how to get a 5v, ~9a power supply because based on my limited knowledge of electronics and such, I won't be able to get more than 5a with a 5v power supply because of ohms law. I'm probably wrong about a lot of things so please please just correct me everywhere I am I'm just trying to learn this stuff and that helps a lot.

I don't understand why you would think that ohms law means you can't have more than 5A at 5V. All ohms law does it tell you the relationship between voltage, current an resistance, it does not put any limits on what values each of those have. It just tells you that if you measure any 2 of them what the 3rd one must be.

Search on Amazon, EBay or where ever you like for a 5V PSU with, maybe, 10A output.

However, 10A at 5V does need reasonably thick wires as even a small voltage drop at 5V will be significant. Best to feed the strip at each end, or at points along its length, rather than 10A all in the one end.

PerryBebbington: However, 10A at 5V does need reasonably thick wires as even a small voltage drop at 5V will be significant. Best to feed the strip at each end, or at points along its length, rather than 10A all in the one end.

I think this is good advice.

The Adafruit site recommends multiple power connections for their WS2812 strips.

Neopixel guide

They are also recommending a power decoupling capacitor and a resistor.