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'IR LED'
1999\03\23@215044 by WILLIE W. HO

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<DIV><FONT color=#000000><FONT face="Book Antiqua">Hi there,</FONT></FONT><FONT
face="Book Antiqua"></FONT></DIV>
<DIV><FONT color=#000000><FONT face="Book Antiqua"></FONT></FONT><FONT
face="Book Antiqua"></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000><FONT face="Book Antiqua">&nbsp; Is there a kind of IR
LED can also emit visible light like LED ?</FONT></FONT><FONT
face="Book Antiqua"></FONT></DIV>
<DIV><FONT color=#000000><FONT face="Book Antiqua">&nbsp; How do I know that
it's working or not after assembly to a PCB board&nbsp; without measuring the
polarity ?&nbsp;</FONT></FONT><FONT face="Book Antiqua"></FONT></DIV>
<DIV><FONT color=#000000><FONT face="Book Antiqua"></FONT></FONT><FONT
face="Book Antiqua"></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000><FONT face="Book Antiqua">Best Rgds,</FONT></FONT><FONT
face="Book Antiqua"></FONT></DIV>
<DIV><FONT color=#000000><FONT face="Book Antiqua"></FONT></FONT><FONT
face="Book Antiqua"></FONT>&nbsp;</DIV>
<DIV><FONT color=#000000><FONT face="Book Antiqua">Willie W.
HO</FONT></FONT></DIV></BODY></HTML>

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1999\03\23@235948 by rweaver8

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WILLIE W. HO wrote:
>
> Hi there,
>
>   Is there a kind of IR LED can also emit visible light like LED ?
>   How do I know that it's working or not after assembly to a PCB board  withou
t measuring the polarity ?
{Quote hidden}

The way I test a ir remote is to use a transister radio. I tune it mid
range on the FM band to a place where there is no station, Turn the
volume up so I can hear the white noise. Then I key the remote. You can
hear the ir interference on the radio.
Ralph

1999\03\24@034039 by russellh

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> WILLIE W. HO wrote:
>
> Hi there,
>
>   Is there a kind of IR LED can also emit visible light like LED ?
>   How do I know that it's working or not after assembly to a PCB
> board  without measuring the polarity ?
>

If you know someone with a video cam-corder, borrow it. Turn on the IR
LED, and point the cam-corder at it. Look into the viewfinder of the
camcorder.

For some reason, color cam-corders show IR LED's blue. BBut in any case,
even a black and white camera will see an infra red LED.

Russell Hedges

1999\03\24@062223 by Joe and Pam

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Why not just get an IR test card?

1999\03\24@091711 by Caisson
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Van: WILLIE W. HO <spam_OUTmtlTakeThisOuTspampub.zhongshan.gd.cn>
Aan: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Onderwerp: IR LED
Datum: woensdag 24 maart 1999 3:29

> Hi there,
>
>  Is there a kind of IR LED can also emit visible light like LED ?
>  How do I know that it's working or not after assembly to a PCB board
without
> measuring the polarity ?

Look at it with a Video or CCD-camera.  You should be able to see it
flicker ...

A (visible-light-emmitting) LED in _series_ could be another option.

Greetz,
 Rudy Wieser

1999\03\24@095012 by Mike Keitz

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On Wed, 24 Mar 1999 00:32:26 -0800 Russell Hedges <russellhspamKILLspamhome.com>
writes:

>For some reason, color cam-corders show IR LED's blue. BBut in any
>case,
>even a black and white camera will see an infra red LED.

Most color cameras have an anti-IR filter that blocks most of the IR.
Usually it will still see a LED if pointed directly at it.  Black and
white cameras, not having any filter, are quite sensitive to near-IR from
a LED.  Also, night-vision equipment is usually sensitive to IR.

You could buy or make a test IR detector with a photodiode or
phototransistor connected to a visible LED, meter, or scope.  There are
also little cards made of special paper that glows orange when exposed to
IR.  Radio Shack used to sell them.


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