Those are blue LEDs, which have a forward voltage of about 3.2V. Since the power supply is 3.3V, I was told that I don't need resistors on them (or it would be something like 5 Ohms or less if I did use one).
I did previously experiment with using different resistors on a blue LED to see if it affects the brightness, as the blue ones are very bright without any resistor. I found that a 330 Ohm resistor (just one I had lying around) reduced the brightness.
Just now I tried using that in my circuit with multiple LEDs and the affect is the same. The blue ones go dimmer when the red ones are on. There is no flickering when all are on, I guess this is because of the reduced current, but my main issue is the change in brightness.
Does it matter how many Ohms are on the blue LEDs?
I did previously experiment with using different resistors on a blue LED to see if it affects the brightness, as the blue ones are very bright without any resistor. I found that a 330 Ohm resistor (just one I had lying around) reduced the brightness.
Just now I tried using that in my circuit with multiple LEDs and the affect is the same. The blue ones go dimmer when the red ones are on. There is no flickering when all are on, I guess this is because of the reduced current, but my main issue is the change in brightness.
Does it matter how many Ohms are on the blue LEDs?
Statistics: Posted by xtal256 — Tue Sep 23, 2025 11:37 pm