Re: IR LED to repair remote control
- From: John O'Flaherty <quiasmox@xxxxxxxxx>
- Date: Tue, 25 Sep 2007 11:00:21 -0700
On Sep 25, 12:17 pm, Andrew <xxrag...@xxxxxxxxx> wrote:
On Sep 25, 12:45 pm, John Popelish <jpopel...@xxxxxxxx> wrote:
If you could ever see them light up, they were almost
certainly 880 nm LEDS, not 940 nm types. A few IR receivers
are also narrow band filtered for 880 nm sources.
I didn't look at the remote ever in the digital camera before hand,
but I tested another remote just to be sure I could see IR, and the
tech support were the people who asked me to try it to look for the IR
lighting up. I presume they expected me to see results this way. I
guess that means that at least one of the two transmitters was 880nm?
The filter serves no function in emitters, except for visual
identification. Some manufacturers tint 940 nm units but
put 880 nm units in clear packages (or vice versa), to
distinguish them. I don't know how standardized this
practice is.
From what I can tell, in the T 1 3/4 (5mm) package, which is what I
need, it seems that all the 940nm that digikey carries are clear
package. But that radioshack emitter at 940nm was tinted, and the
radioshack matching emitter was clear. Go figure?
Most receivers work with either wavelength. Only a few
based on narrow band gallium arsenide aluminide detectors
work only with the 880 nm types.http://www.optodiode.com/pdf/SEN5249e.pdf
The great majority of receivers use silicon detectors with
long pass optical filters that block most visible
wavelengths that the silicon is also sensitive to.
So it seems that a more "universal" wavelength of this purpose would
be 880nm?
A good choice might be the TSAL6100 (950 nm) or its high
output cousins (assuming you can use the 5mm diameter package).http://www.vishay.com/docs/81009/tsal6100.pdfhttp://www.vishay.com/do...
It seems that the LITE-ON 940nm I listed has similar, if not a little
"better" specs in all categories than the 950nm TSAL6100? And a
little wider viewing angle to boot. Was there something about the
LITE-ON LTE-5228A that you didn't like? (http://rocky.digikey.com/
WebLib/Lite-on/Web%20Data/LTE-5228A.pdf).
But if I was going to order something, I would get both 940
and 880 nm variations. If the control has more than one
emitter, I might use some of both.
Yeah, there are two emitters, so I think I might try an 880 and a
940. Likely the 880 from Vishay and the 940 from lite-on.
As an additional question. Does anyone have any clue why these diodes
would both go out completely randomly in the original unit? It was
about a year and a half old, and I found a number of posts of the
exact same thing happening to other people after almost the same
amount of time. I could see one of the diodes going out, but both
simultaneously? Maybe they are connected in series? Or maybe one
went out and I never noticed, then the other went? I wouldn't mind
examining it a little further to find the root cause, or at least
hopefully the new diode I put in exceeds the original diode's
specifications such that the problem isn't repeated.
You could have an intermittent bad connection in the remote, which
would explain the replacements failing soon. You might check for
voltage with a meter, or preferably a scope, at the exact moment when
you know there is no light coming out.
--
John
.
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