[Elecraft] Re: PC boards for the K2 RIT-SPLIT LED Mod

[Wayne Burdick]

Sverre,

LEDs that work well down to as little as 1 mA in room lighting are now widely
available. That's why we didn't add a DC current gain stage here. Try a "super
bright" type, available from Digikey, Mouser, etc.

73
Wayne
N6KR


Sverre Holm wrote:
> 
> Thanks Tom for your never tiring efforts in supporting our K2's!
> 
> > The LED can draw no more than 3mA of current through the IC
> > which drives
> > it, so you MUST first find an LED and CONFIRM that it will provide
> > acceptable light output when drawing a maximum of 3mA (2mA is
> > better).
> 
> I guess you could just add a general purpose PNP transistor set up as an
> emitter follower to source more current here, say 10-20 mA if desired.
> If I am right (it's right after midnight here!), it would take one PNP
> plus a resistor in addition to the circuitry shown in Tom/Wayne's memo.
> 
> --
> 73,
> Sverre
> 
> ------------------
> Sverre Holm, LA3ZA
> www.qsl.net/la3za
> 
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