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Old June 16th, 2008, 04:14 PM   Digg it!   #1 (permalink)
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Please Help! LED IR Array

I am trying to build a LED IR Array for a infrared camera for my comp ( I couldnt find a good forum for this so i just put it in here)

I am having trouble getting the right resistors for the project. I am using 12 volts because thats the only battery pack i could find and i am using 940 high intensity LEDs with a 1.28 voltage drop, they run on 29 mA and I am usign 10 of them
__________________________________________________ ______
This is what it gives me on the Resistor calculator
+12V
18Ω
GND
390Ω
The pic is kinda distorted sorry
  • You will need 1 x 18 ohms 1/8 watt and 1 x 390 ohms 1/2 watt resistors.
  • The 18 ohms resistor is color coded: Brown, Gray, Black, Gold.
  • The 390 ohms resistor is color coded: Orange, White, Brown, Gold.
  • Each 18 ohms resistor consumes 15.138 milliwatt.
  • Each 390 ohms resistor consumes 327.99 milliwatt.
  • Total power consumed by the resistors is 343.128 milliwatt.
  • Total power consumed by the LEDs is 371.2 milliwatt.
  • Total power consumed by the circuit is 714.328 milliwatt.
  • Total current drawn by the circuit is 58 milliampere.
  • The resistor values are calculated based on the common ±5% tolerance resistors.
  • Make sure to wire the LEDs in the correct direction as shown below.
  • Always leave some space for the resistors to breathe. They might get hot.
LED Calculator - Current limiting resistor calculator for LED arrays

__________________________________________________ _______________
So really i need help finding the resistors cause i cannot find the right ones.

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