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'[EE]: IR LED recommendations?'
2004\07\05@153011 by Marc

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I'm looking to build a small serial port based IR transmitter for
controlling a cable TV box...something similar to the schematics for lIRC.

Any recommendations on a decent T1 or T13/4 sized IR LED that would be
available from Digikey?

Obviously needs to be something relatively low powered as it's being
driven from a serial port (which a suitable capacitor acting as a charge
pump).

TIA :-)


-marc

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2004\07\05@164649 by John N. Power

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> From:         Marc[SMTP:spam_OUTmarcTakeThisOuTspamGEEKYTHINGS.COM]
> Sent:         Monday, July 05, 2004 3:29 PM
> To:   .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
> Subject:      [EE]: IR LED recommendations?

> I'm looking to build a small serial port based IR transmitter for
> controlling a cable TV box...something similar to the schematics for lIRC.

> Any recommendations on a decent T1 or T13/4 sized IR LED that would be
> available from Digikey?

> Obviously needs to be something relatively low powered as it's being
> driven from a serial port (which a suitable capacitor acting as a charge
> pump).

> TIA :-)


> -marc

A search for "IR LED" on Digi-Key only returned 2 IR leds, both of which
had fiber optic outputs. Perhaps a more careful search would have found
something more, but my Radio Shack catalog (2001) shows a

"High-output Infrared LED" in T 1 3/4 size, 20mA, 1.3 VDC, 940nm
wavelength, as RS part number 276-143, $1.69

John Power

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2004\07\05@165521 by Kevin

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Digikey has $25 minimum.
I have been very happy with http://www.glitchbuster.com.
Cheap prices, fast service, and only $1.85 S&H charge.

~Kevin

On Mon, 5 Jul 2004, John N. Power wrote:

{Quote hidden}

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2004\07\05@171348 by Jason S

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Randy at Glitchbuster.com sells "T1-3/4 IR LED/emitter, like: RS 276-143"
for 37 cents.  He even says it's like that Radio Shack one :).

I bought 2 and they are fine for your use.  His shipping is quite low at a
flat $1.85, so if you buy 2 you're already ahead of buying 2 at Radio Shack,
and he has great prices on a lot of pic-related items.

Jason



{Original Message removed}

2004\07\05@192526 by PicDude

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On Monday 05 July 2004 03:46 pm, John N. Power scribbled:
> A search for "IR LED" on Digi-Key only returned 2 IR leds, both of which
> had fiber optic outputs. Perhaps a more careful search would have found
> something more, but my Radio Shack catalog (2001) shows a
> ... ...

It would have --  I found quite a bunch under the sub-category "Infrared Emitters".  In particular, I use the LNA2802 (T-1 size) in a couple projects and it works very well with Vishay or Panasonic IR receivers.

I run 11ma (though the datasheet says it can use quite a bit more) thru the LNA2802 and get decent range (I tested to over 10ft).

Cheers,
-Neil.

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