[Elecraft] [MM] The W1 LED Experiment

[Joel Curneal]

The p/ns for the leds that I used from www.sparkfun.com are
Red  --   COM-00528
Yellow  --   COM-00530    ( it lights up as amber )
Green  --  Com-08285

These are T-13/4 round leds.  They do fit in the spaces provided although
they do cover up part of the the silkscreened SWR values.  I filed off some
of the flanges so more of the silkscreened SWR values show.  I did not
change the power leds.

I used 3 green ones ( 1.1, 1.2, 1.3 ),  2 yellow ones ( 1.5, 1.7 ) and 5 red
ones.

I do not have any pictures,  I am in the process of moving and much of my
stuff is packed up.  I will get the W1 out and take a couple of pictures as
soon as I can.

Joel   N1JEO

----- Original Message ----- 
From: "Bill Johnson" <bill at creeksidecomputing.com>
To: "'Joel Curneal'" <jcurneal at meridenarc.org>; <elecraft at mailman.qth.net>
Sent: Sunday, March 08, 2009 1:23 PM
Subject: RE: [Elecraft] [MM] The W1 LED Experiment


> Joel,
>
> Do you have the part #'s as I note there are a couple different in each
> color?  I note these are round versions and I wonder if these are
difficult
> to line up in the display due to any manufacturing differences.  Do you
have
> a Picture of your finished product?
>
> 73,
>
> Bill
> K9YEQ
> K2 #35; KX1 #35; K3 #1744; mini mods
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joel Curneal
> Sent: Thursday, March 05, 2009 4:22 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [MM] The W1 LED Experiment
>
> Has anyone else tried high intensity leds in their W1?  I replaced the
leds
> in my W1 with high intensity red,  yellow (amber), and green leds from
> Sparkfun Electronics.  A pic can drive them to a much higher light output
> without any other changes to the W1 circuit board.  The light output from
> the different colors is almost the same on a stock W1 board.
>
> Joel,  N1JEO
>
> ----- Original Message ----- 
>
>
> > I apologize for taking so long to conduct the LED experiment and get
> > back with everyone interested. I had some lead times on parts I ordered
> > not to mention getting some time to run everything through. I must
> > mention first that I had to do numerous swaps of different LEDs and
> > resistor packs and this simply would not have been possible to do in a
> > timely manner without using my new Hakko 808 desoldering tool. I'm sure
> > I would have damaged the W1 PCB trying to do it manually over and over
> > again. That thing was worth every penny I paid for it.
> >
> > The slight differences in forward voltages of the various LEDs played no
> > appreciable role in current consumption. So I'll just list the 3
> > resistor pack values I used. I did look up the LM78L05 regulator spec
> > sheet and found out it will produce up to 100ma output current. The
> > current W1 design operates at far less than that. The LEDs are probably
> > pulse width modulated (or simply polled) by the PIC also so the current
> > draw per LED seems to be about half of what you would calculate with a
> > voltage of around 3v and the resistor pack value.
> >
> > Here is some of the data:
> >
> > W1 idle current: 13.8 ma
> >
> > Current draw regardless of LED type per resistor pack value (18 out of
> > 20 LEDs lit):
> >
> > 2.0k - 27.5ma
> > 1.0k - 39.3ma
> > 470  - 63.0ma
> >
> > I wanted to try an 810 or 680 ohm resistor pack, but could not get them
> > in time from Digi-Key. As I personally wanted to stay within the 50ma
> > range, the 1.0k value works for me. Like I said, to my eyes in a well
> > lit environment, this value seemed to work fine with the Lumex LEDs
> > although the Avago red LEDs were a hair brighter.
> >
> > Part numbers:
> > My configuration:
> >
> > All Digi-Key part #'s
> >
> > Lumex Red 2x5mm LED    - 67-1047-ND
> > Lumex Yellow 2x5mm LED - 67-1050-ND
> > Lumex Green 2x5mm LED  - 67-1046-ND
> >
> >
> >
> > 73,
> > Dave W8FGU
> >
>