[Laser] led txr

[Zack Widup]

I just checked, and Digi-Key also has some, for those of us in the
USA. Their part number is 475-1339-1-ND. I think I will order some
today.

It appears they have ~300 in stock and are not going to re-stock them
after that, but 300 should be enough to cover most of us!

73, Zack W9SZ

On 11/19/10, I <stuart.wisher at talktalk.net> wrote:
>
>
> Hello again folks,
>
>
> Lets just say then that here is a working practical design for a transverter
> and LED transceiver using a modern high power LED and leave it at that.
> I think Edison and Swan had the same problem with the light bulb! I am not
> really concerned about that issue, rather, I am more keen to share my stuff
> with all you who are interested.
> I think most of us already knew LEDs would detect light, and Tim told me he
> remembered some short range stuff from a while ago.
> It was also very interesting to hear of all the historic stuff, particularly
> with various crystals though.
>
>
> Now for some practical help with the microsurgery. I do not have a good
> enough image, but there is some help here, if you  have got the correct LED
> W5SM HYJY-1-Z, (who knows, others may work as well), this is available from
> RS components in Europe, part number 665-6189.
> They have a datasheet
> http://docs-europe.origin.electrocomponents.com/webdocs/0d15/0900766b80d159a7.pdf
> which has a drawing towards the end of the document. It shows the internal
> lozenge shaped terminal above the cathode connection. There is one gold wire
> that goes from this terminal to the LED chip in the middle, and another that
> goes from the terminal to the protection diode at the left (at eight o'clock
> if it were a clock face) just use a sharp knife and press down on this wire,
> its only silicon gell. As I said your multimeter will show 1.056V forward
> volts until you break the wire when it will show open circuit. A friend who
> has tried it, and I have not wrecked an LED yet. I have tried voltages up to
> 50V in reverse, but using a 100k resistor in series (as per the circuit), up
> to a certain voltage you get a signal, beyond that you hear the noise
> increase. It is just a matter of finding the optimum which has varied for me
> from 43V up to nearly 48V. Please remember to use at
>   least a 63V rated capacitor in the circuit to decouple the reverse bias
> supply to the LED ( and do not forget the 33 ohm resistor in series or you
> will weld the relay contacts). Someone forgot about the voltage rating an
> used a 25V capacitor and found 200microamps of leakage which pulled the
> reverse bias down to 30V. The resistance is so high that I have not managed
> to destroy an LED yet. The original link details experiments up to over
> 200V.
>
>
> I hope I have covered all the questions,
>
>
>
>
>
>
> Stuart G8CYW
>
>
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