Btw what is the purpose of the resistor in the signal path?
To stop you frying the first LED in the strip if the strip's supply voltage drops lower than the driving signal and to prevent reflections on the line between strip and Arduino causing excess voltage spikes.
Would be an internal resistance of a 74LS buffer sufficient?
And what stops the 74LS buffer from frying? Look a resistor is only $0.01 what is the big deal?Now I am on my laptop I can show you the signals with and without the resistors.
Is there any difference if the resistor is at the MCU or at the LED?
Would you say such capacitor is beneficial if I use a power supply like this one?
Could you recommend a brand with not crappy designs?
Can I measure with a multimeter whether this capacitor is required?
If I fried the first LED, would that result in a break on the strip's 5V line at the first LED?
It was working fine for a while and when I tried to plug it in again, this is what I realized