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IR leds and AA batteries

 
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Nowhere.
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Joined: 27 Nov 2007
Posts: 1

PostPosted: Sun Dec 09, 2007 4:53 pm    Post subject: IR leds and AA batteries Reply with quote

Two questions
How many IR leds could I possibly run from a 1.2v NiCAD AA battery

and

Do they make SMD IR LEDs? I haven't been able to find any online

Thanks in advanced
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Tue Dec 11, 2007 10:06 pm    Post subject: Re: IR leds and AA batteries Reply with quote

Nowhere. wrote:
Two questions
How many IR leds could I possibly run from a 1.2v NiCAD AA battery

and

Do they make SMD IR LEDs? I haven't been able to find any online

Thanks in advanced


I am sure there are surface mount IR LEDs around, I haven't seen any though...

I am assuming that the forward voltage of the IR is less than 1.2 volts otherwise you will either need a second battery to increase the voltage or build a circuit that increases the voltage. The number of LED will depend on how much current the LEDs will draw and the current capacity of the battery.

For example if the battery will supply 100mA for the duration you need and a single LED draws 25mA then you would be able to operate 4 of them.
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anotherhackmember
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Joined: 10 Jun 2006
Posts: 32
Location: CA

PostPosted: Thu Dec 13, 2007 7:49 pm    Post subject: Reply with quote

Yes, SMD IR leds are common.
Try Digikey
Try Goldmine Electronics http://www.goldmine-elec-products.com/searchprods.asp part# g13767.

1.2V is just at the bias voltage and could be below it for different led companies. Plus the 1.2v batteries will drop below 1.2v so I suggest using at least 2 batteries, a 3v button (my approach), or a small boost converter circuit as the supply support.
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