[Elecraft] KDSP2 Build

[Tom, W6WW]

Since this is my first K2, I think I had better build it stock and get it
working.  Later I can play around with mods.

73,
Tom, W6WW
K2 #3453

> The parts to do John's mod do not come with the KSB2. You will need to
> change 10 to 12 caps to different values. I ordered the caps from Mouser
but
> Elecraft may have them. It would be easier to install the caps when
building
> the KSB2 as some of them are hard to get to on a completed board. If you
are
> doing a retrofit then I would highly recommend a Hakko solder removal
unit.
> John lists the values for a 2.5 KHz, 2.2 KHz and 1.9 KHz all with better
> ripple specs. I have done the 2.5 KHz 3 or 4 times and the 1.9 KHz once.
The
> K2/100 I built for Eric had the 2.5 KHz filter in it. The 1.9 KHz filter
> only requires 4 caps to be changed and has better ripple than the stock
2.0
> KHz filter. The values needed for the 2.5 KHz filter are two each 39pf
27pf
> 150pf and four 33pf all 5% monolithic ceramic .1 inch lead spacing. You
will
> also remove two 10 pf caps. Remember this may not work with the older
> crystal sets so you may need to install a new set of matched crystals. If
> you are replacing the crystals the cap swap is easier to do while the
> crystals are removed. Anyway SN 1808 and SN 2174 have the 2.5 KHz filter
mod
> and KDSP2's. SN 3171 will be built with the 2.5 KHz when I get time to
> finish it. I am happy with how they sound.
>