Martaine2005
- May 12, 2015
- 4,932
- Joined
- May 12, 2015
- Messages
- 4,932
Hi guys, I am a little discombobulated.
I don’t have the data sheet for these.
I have 5mm RGB common anode and common cathode LEDs. I am only using RED and GREEN, BLUE leg is snipped off.
I want GREEN on constantly dim and RED to over power the GREEN by being brighter when switched on.
I’m supplying 14V and current limiting RED with 1K (11mA). This is bright enough and I’m assuming Forward voltage is 2 to 3 volts.
Now, the for the GREEN. I have gone through my resistor values to get a nice dim glow. Calculations seem pointless now, 1mA was still too bright. I am now satisfied with 3MΩ. But wow, 0.00003μA?.
Could this be a mistake?
It’s the same with common anode and common cathode.
Martin
I don’t have the data sheet for these.
I have 5mm RGB common anode and common cathode LEDs. I am only using RED and GREEN, BLUE leg is snipped off.
I want GREEN on constantly dim and RED to over power the GREEN by being brighter when switched on.
I’m supplying 14V and current limiting RED with 1K (11mA). This is bright enough and I’m assuming Forward voltage is 2 to 3 volts.
Now, the for the GREEN. I have gone through my resistor values to get a nice dim glow. Calculations seem pointless now, 1mA was still too bright. I am now satisfied with 3MΩ. But wow, 0.00003μA?.
Could this be a mistake?
It’s the same with common anode and common cathode.
Martin