Need help for IR illuminator

186

03:52:31

Hello guys, I wish all of you have a nice new year! 

I want to make an IR illuminator with 20 IR 940nm leds for a nightvision camera. They support 1,4V and 100mA while lighting continously. But I'm sooo confused! What battery I need?  How many resistors? Is it better to connect them in series or in parallel? Thank you and sorry for my noob questions!

*Important! The leds must be (exactly) at these positions because I have create a breadboard with this circuit.  The battery, resistors etc can be placed anywhere.

published 11 years ago

UncleRick

11 years ago

Get rid of the current controller. It is not your friend. The battery must have enough voltage to light all of the LEDs and a little more. Make adjustments in the resistor to achieve the level of brightness that you want. Hint: You don't want any flames.

WTFCircuit

11 years ago

Delete the current source, you have to do two series of 10 LEDs each and colleagues in parallel, powered by a 14V battery

karlisHDI

11 years ago

Get the current source down to 35 mA

Zouglou

11 years ago

If you put your LED in parallel it will work fine

Sine_eyed

11 years ago

No no no, it's all wrong. First, if you are making this on a breadboard there's absolutely no reason the LEDs need to stay the way they are. You MUST reorder their layout because I think you'll have a hard time finding a 28V battery or rigging some equivalent to power this thing. Next, YOU need to know what battery (or whatever) you're going to use! Any guidance we could give you could end up totally wrong if we assume you're using a 12V source but you can't find one so you use a 6V source instead. That changes things! So, figure out your power source then get back to us, and we'll go from there..

faceblast

11 years ago

joule thief

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