[Elecraft] [K3] K3 Rev C DSP with Low Freq Enhancement ship date info; New swap out option on parts order page. CORRECTION

[Paul Christensen]

> This should be close but Elecraft has not updated their schematics since
> October 2008, so there could be differences:
>
> http://n1eu.com/K3/k3audiomod.htm

Lyle and I exchanged notes on this a while back as he and I were 
experimenting with DSP Board component changes above and beyond the 
much-discussed headphone cap change.  My guess is that the Rev. C board 
changes take the notes in the link into account.  However, he was re-scaling 
R values.  I had re-scaled C values since fewer components were involved in 
solder re-work.  The net result is essentially the same but changing R 
values likely makes more sense in production where the cost of SMT resistors 
is essentially the same irrespective of component value versus the increased 
cost of higher-valued capacitors.  And as Bill points out, there may be 
other subtle differences.

Given the number of changes to the DSP Board, I recommend taking advantage 
of Elecraft's swap-out program unless there's a lot of comfort in SMT/SMD 
re-work.

Paul, W9AC