moesciphish
Newly Enlightened
- Joined
- Jul 30, 2005
- Messages
- 33
Hello all, I'm sort of a noob to LED's so please excuse my ignorance. I found a great website to calculate the resistors I need for using LED's standalone, in serial, or in parallel circuits: http://metku.net/index.html?sect=view&n=1&path=mods/ledcalc/index_eng
great site check it out. Here is my confusion though. If I'm running an say 5, 3.6v 20ma LED's in a parallel and I'm using a 3.6v power supply, it says I don't need a resistor. Though I thought LED's were constant current diodes and NEEDED a resistor no matter what. So I'm a little confused. Also, would it be bad to run a 3.6v LED off of a 3.6v supply? Rather better to use say a 4.5v with a resistor? Ok final and last question, I don't know if it belongs here but it has to do with what I'm working on. If I get a 7.2v 3300mAh battery and connect it to some LED's with resistors that are pulling 3.6v and a total of 600mAh, would I get about 5.5 hours of battery (3300/600) or would it actually about double because I'm not pulling the full 7.2v's through the use of resistors? Any help would be TREMENDOUSLY appreciated.
Thank You
great site check it out. Here is my confusion though. If I'm running an say 5, 3.6v 20ma LED's in a parallel and I'm using a 3.6v power supply, it says I don't need a resistor. Though I thought LED's were constant current diodes and NEEDED a resistor no matter what. So I'm a little confused. Also, would it be bad to run a 3.6v LED off of a 3.6v supply? Rather better to use say a 4.5v with a resistor? Ok final and last question, I don't know if it belongs here but it has to do with what I'm working on. If I get a 7.2v 3300mAh battery and connect it to some LED's with resistors that are pulling 3.6v and a total of 600mAh, would I get about 5.5 hours of battery (3300/600) or would it actually about double because I'm not pulling the full 7.2v's through the use of resistors? Any help would be TREMENDOUSLY appreciated.
Thank You