[Elecraft] Leds for W1

Bill Johnson bill at creeksidecomputing.com
Sat Feb 21 09:29:22 EST 2009


It seems we need to find a set of colored LED's that give similar output as
the reds....  With the research done so far, doesn't look at that likely. I
wonder if there are other resources.  I wonder if a resistor pack of a
slightly higher value than 470 might be a better compromise and change the
value of the SWR reds so they won't draw more than the others. This would
help reduce power draw.


73,

Bill
K9YEQ
K2 #35; KX1 #35; K3 #1744; mini mods


-----Original Message-----
From: Doug Joyce [mailto:d_joyce at sympatico.ca] 
Sent: Friday, February 20, 2009 9:40 PM
To: Bill Johnson; 'Dave Van Wallaghen'; 'Jack Smith'
Cc: elecraft at mailman.qth.net; 'Ken Kopp'
Subject: Re: [Elecraft] Leds for W1

Bill:  I've done some further testing and believe it's going to take
increasing the current to approx 6 to 7 ma to get the new coloured LEDs to
be bright enough.  That would involve reducing the 2.2 Ks to approx 470 ohms
and finding a source for a suitable resistor pack.  At this higher current
the red LEDs are still brighter than the other colours and there is no easy
way to separately control the current to individual colours.

There are also a number of other things to check such as the ability of the
U3 regulator to handle the increased current.  Battery life will also be
reduced and perhaps this "coloured version" needs to be run from a wall
wart.

73

Doug,  VE3MV

----- Original Message ----- 


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