@lohikarhu734

Good to note that the Vf is directly (about) related to the  inverse of the LED emission wavelength...and to note that the "white" LED is a blue LED with phosphors costing it for wavelength conversion... Just a thought, or two...

@Enigma758

The Vf's actually directly correspond to the wavelength.

@friendlypiranha774

Now I understand resistors, thank you.

@lohikarhu734

BTW, you ought to note that Vf varies a lot with Vf; just measure the Vf across each LED with the different resistor values... I used to be responsible for 2x10 ^9 LEDs per year....

@aligunaydn9912

Have you ever made a breadboard computer with transistors? If you did, can you make a video?

@Fereydoon.Shekofte

So good video 😊😊
Thank you very much for your efforts 🎉🎉❤❤

@lizabelledeguzman2261

The circuit at 3:34 is a parallel circuit right ?

@RyeonLok

Wait, current at series circuit should be the SAME right?

@FD-dh2fu

Great information.  Thank you for the wonderful break down.

@aligunaydn9912

Can you recommend a power led?

@wouterhorselenberg4247

Why does the 3V source + 3V Led Forward Voltage have a  resistor of "Led Off"? I'm kinda confused what happens when the Source and Led Forward Voltage match and how to calculate limiting its brightness in this situation... as all calculations seem to try to devide a value of 0 (3V-3V=0V)/Amps.
Lets say I would like to run my leds at 0,010A instead of 0,020A. I would then calculate 0/0,010 = 0 also... How is this done?

@lohikarhu734

Why do you say that the brightness of the 5mm LED will be higher than the 3mm LED...if they have the same Vf at the same If, they are the same die size...the 5mm LED has more optical material, and can make a "tighter" beam, but the total light output is probably the same...

@garymucher4082

Interesting LED display. I just forego trying to figure out forward drop for any L:ED and simple install a resister to only allow around .020amps or less. And regardless what the LED forward voltage drop is, the LEDs of any type lights. And you will never ever blow any LED doing that...period!

@86ChickHicks

My LED fused

@deang5622

The resistors don't limit the current. They set the current for a specified supply voltage. There is no current limiting effect whatsoever.

Lets use the correct terminology please, terminology which accurately reflects what is going on.