What size resistor to you need for a LED with Vf=3.0 if the power supply is 3.0V? None?
What size resistor to you need for a LED with Vf=3.0 if the power supply is 3.0V? None?Just checking because I have NEVER run into this before.
You don't always need a resistor.
Just add up all the posts of the people who say you need a resistor and compare it against your post count. Tell you anything?
I don't see how my post count is relevant to my experience, if that's what you were intending to suggest.
If you have a bench power supply, set it to 3.3V and connect it to a 3.3V LED, it will be absolutely fine and you won't need any resistor.
The supply is still a voltage source, as opposed to a constant current source.
But in some cases, such as the cases I have listed in the post you were reacting to, you can get away with it.
Why so grumpy?
Well seeing as you are disagreeing with everyone else you must be very naive.Rubbish, please read the replies from the grown ups again and see why this is not OK.(...)
You should seriously learn some electronics.
I do have a bachelors in electronic engineering, getting a masters degree this year
First off, I wasn't asking the question.I AM NOT the original poster.
This forum is for beginners and your advice is not suitable for beginners.