[Elecraft] W1 LED Part Numbers

[Dave Van Wallaghen]

Good morning all,
I apologize for the late reply. I was up late last night during my shift 
and the dog and I took a little siesta this morning when I got home ;-)

Just to add a little more info. I looked up the internal Elecraft part 
#'s for the leds used in the W1 and the KAT100 and the red ones are 
specified as different internal part numbers. I sat my W1 next to the 
KAT100 this morning and indeed they physically look different also.

I'm not exactly sure, but I think the Mouser part numbers posted may be 
the leds specified for use in the KAT100 and may be the reason they look 
dimmer.

I don't want to duplicate any efforts here, so has anyone tracked down 
the manufacturers part number for the leds used in the W1 from Elecraft? 
If not, I can surely email Scott and see if he has one that we can cross 
reference with Digi-Key. Usually, if you have at least some type of 
manufacturer number, you can search for it on their web site. Or is that 
what you already did Doug?

Thanks for the generous offers to both Doug and Ken for sending me some 
samples. Maybe we can track this down a little further before we get 
there though.

Thank you all for your time, I didn't realize this was going to take up 
such bandwidth here. Hopefully we're getting closer.

Take care & 73,
Dave W8FGU

Doug Joyce wrote:
> Ken / Dave:  Just to let you know, I did this with equivalent / the same 
> parts (I'll provide the part numbers I used later this AM) and at 20 ma 
> fwd current they do indeed seem to all have equivalent brightness.  The 
> problem I found is that when installed in the W1, they don't light up 
> with the same intensity as the red ones supplied.  I used other colours 
> of green, yellow and amber / orange.
>  
> I haven't spent a lot of time to investigate, but what I found so far is 
> that the fwd voltage drop on the red LEDs is smaller than on the other 
> colours, and in the W1 cct it is a smaller percentage of the supply 
> voltage of 5 volts.  This results in more fwd current that available for 
> the red compared to the other colours, hence the red appears to be 
> brighter.  The next step I need to do is to actually measure the current 
> provided by the W1 for these other colours.
>  
> I got 10 of each when I  ordered then from DigiKey - Dave, if you 
> provide your mailing address, I'll send you a couple of each and you can 
> try then in the W1 as well.
>  
> 73
>  
> Doug,  VE3MV
>  
>  
>  
>  
> 
>     ----- Original Message -----
>     *From:* Ken Kopp <mailto:k0pp at rfwave.net>
>     *To:* w8fgu at comcast.net <mailto:w8fgu at comcast.net> ; Doug Joyce
>     <mailto:d_joyce at sympatico.ca> ; elecraft at mailman.qth.net
>     <mailto:elecraft at mailman.qth.net>
>     *Sent:* Thursday, February 19, 2009 10:52 PM
>     *Subject:* Re: [Elecraft] W1 LED Part Numbers
> 
>     I have a "set" of additional green and yellow LED's
>     from Scott at Aptos.  He got them for me from the
>     stock bins and didn't include their stock numbers.
>      
>     I'll light them with a PS and see if their all the same
>     brightness and take a photo.
>      
>     They -should- be the same product line and therefore
>     light equally, I'd think.  They're from the KAT-100
>     tuner.
>      
>     Scott was at least receptive to making all the W1
>     kits with three colors of LED's.
>      
>     73! Ken
> 
> 
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