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Author Topic: Will these LEDs work?  (Read 6333 times)

Offline harry20larry

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on: February 08, 2008, 12:55:25 AM
Just bought some off ebay:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=200197162909&ssPageName=STRK:MEWN:IT&ih=010
Here is the item number:
200197162909

And if you can't be bothered, here are the specs:
DESCRIPTION

20 INFRA RED 5mm LED’S

TECHNICAL SPECIFICATIONS

RADIANT INTENSITY  13--16 m/W/Sr AT If= 20m/a

RADIANT INTENSITY 55 mW/Sr AT If=100m/a

FORWARD VOLTAGE 1.2—1.5v

FORWARD CURRENT 20m/a

DOMI WAVELENGTH 940nm

HOUSING WATER CLEAR

VIEWING ANGLE 25 degrees

All I want to know is, will these work with ir pen set up with 1.5v (single battery) going through it. And also, if want to make some of those glasses, would these work too.
thx
harry20larry


Offline Helza

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Reply #1 on: February 08, 2008, 01:40:03 AM
the RADIANT INTENSITY 55 at 100m/a is on the low side, i think that johnny lee suggested 100mw/sr at 100ma led's..


Offline harry20larry

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Reply #2 on: February 08, 2008, 11:31:49 AM
Followed the link JL gave us to the LEDs he used, I then went to the specification .pdf and found this:

Basically, JL is running ones that are even less powerful than mine, thx for the help though!


Offline dice

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Reply #3 on: February 08, 2008, 11:36:24 AM
these LED's look like the same ones that come from Radioshack, and those work fine. 

It not a bad price for them, so I would go for it.

Dice :)

Also look at these Click here
« Last Edit: February 08, 2008, 11:39:09 AM by dice »


Offline Helza

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Reply #4 on: February 08, 2008, 05:24:38 PM
you're right, sorry about that... just checked the specifications from the tsal-6400 and it said 125 MAX... :) i thought it said was the norm :)

Bought the wrong ones myself :) turned out the be mini IR leds which had a rating of 6,3 mw/sr only :( after 10cm they're out of range..
Should teach me to investigate better next time..



Offline Volsfan91

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Reply #5 on: February 08, 2008, 09:15:39 PM
Quote from: dice on February 08, 2008, 11:36:24 AM
these LED's look like the same ones that come from Radioshack, and those work fine. 

It not a bad price for them, so I would go for it.

Dice :)

Also look at these Click here
Do the Radioshack ones work well for the Whiteboard project?


Offline harry20larry

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Reply #6 on: February 09, 2008, 01:24:36 PM
It says at 20m/a it is less powerful, and at 100m/a it is more powerful (on my specs) how do I make it go to 100m/a, do I just pump the full 1.5v through or what?


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