|
1. The original circuit is good - With each LED carrying a "current sharing" resistor.
Putting LED's in parallel without the resistors will not ensure that each LED gets the same current because of mismatches in the manufacturing process - see "Thermal Runaway".
A constant current source will not ensure equal current distribution as each LED has a different on resistance. Of course each LED may have its own constant current source.
2. The forward voltage of the LED's was put at 3.6V this is good for White and Blue LEDs but Red LEDs have a forward voltage of 1.6V - What colour LEDs are you using.
Addition: No answer required - White LEd it is!!!
Jerry.
Last edited by 74tuc; 19-05-2007 at 04:49 PM.
Reason: Point 2 Modified
|