cyrusthevirus
New Member
First:
If I have a string of 12 LEDs which have a Fv of 3.5V @ 700mA and 3.7 @ 1000mA and have a hypothetic constant power supply that is exactly 42V and 1A what will the Fv of the LEDs be? Are they limited by the voltage or the current?
Second:
My LCD has a LED which has a forward voltage of 4.2V and draws 300mA. The power supply supplying my PIC and LCD is 5V/1A. Other than a resistor for the LED do I need to reduce the current to the LED? Why or why not?
If I have a string of 12 LEDs which have a Fv of 3.5V @ 700mA and 3.7 @ 1000mA and have a hypothetic constant power supply that is exactly 42V and 1A what will the Fv of the LEDs be? Are they limited by the voltage or the current?
Second:
My LCD has a LED which has a forward voltage of 4.2V and draws 300mA. The power supply supplying my PIC and LCD is 5V/1A. Other than a resistor for the LED do I need to reduce the current to the LED? Why or why not?