Knowing what resistor to use is way to confusing for me. I thought I had figured it out. But then I started taking junk apart and trying to figure things out. I have run into a confusing issue. Almost every white 5mm LED I have used/seen requires 3.6ish V to 4.0 V max, but I have seen them with 5V going to it with just a resistor on it. Why isn't that LED burning out? Or is it the max current that matters?
Knowing what resistor to use is way to confusing for me. I thought I had figured it out. But then I started taking junk apart and trying to figure things out. I have run into a confusing issue. Almost every white 5mm LED I have used/seen requires 3.6ish V to 4.0 V max, but I have seen them with 5V going to it with just a resistor on it. Why isn't that LED burning out? Or is it the max current that matters?
Ok, so before I go trying something dumb with these I want to double check that I am reading the info correctly. When the box says FW supply this means?
Ok, so before I go trying something dumb with these I want to double check that I am reading the info correctly. When the box says FW supply this means?
Always use the nominal voltage drop, not the maximum voltage drop and use the recommended operating current not the absolute maximum.
Round the resistor up to the next preferred value not down, especially if you're using a current close to the maximum. For example, if you calculate 50R, use 56R rather than 47R.