Driving Leds
Can you help me to build a current source with minimum power loss? forward voltage of my sample leds is 3.2 - 3.6V @ 80mA. My power supply is 12.8 - 13.2VDC. it is not a good way to drive leds through a voltage source because brightness then depends on your supply voltage. Below is the circuit i think to use. but the problem is the power lost in regulator and resistor as heating.
R L1 L2 L3 o------|LM317|--/\/\/\/\--------|---|---|---- |_______________| | 13VDC | | o------------------------------------------------ Thanks. |
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