[Elecraft] K3 Audio Low Pass Filter

[Ron D'Eau Claire]

I don't know who wrote the instructions you got. I've not worked on
installing that board.  

It sounds like it uses some open vias (the round 'grommets' that join traces
different opposite layers of the board together. 

I'd bet the person who created the document had a version with open vias.
However, I've noticed that some boards have the vias open and others have
them full of solder. 

Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Mike Scott
Sent: Friday, July 03, 2009 1:05 PM
To: Elecraft at mailman.qth.net
Subject: [Elecraft] K3 Audio Low Pass Filter

I just completed an installation of the K3 audio low pass filter board, the
one Lyle put out to individuals who wanted to try it. I was busy until now
as the boards came out some time ago.

It took a lot longer than expected because all the K3 DSP board holes were
full of solder. The instructions seemed to indicate that four of the holes
should have been clear, i.e., just stick the leads through. The instructions
seemed to be missing a section though as they never suggested soldering four
of the wires. I thought maybe a page was missing but the step numbers didn't
seem to indicate missing steps. Anyway, solder wick and solder suckers
didn't work. The holes are very small and it is tight quarters where a
miscue of the soldering iron could cause damage. I finally had to heat the
wire I wanted to put in the holes (resistor leads) and heat my way through
the soldered holes.

For future reference, what would be the right way to do this? 

I would like to consider making more audio modifications, the one changing
headphone audio coupling capacitors to larger values for example. I looked
at those capacitors and I wondered how I was going to get them out. The
solder leads on one side seemed to be down at the bottom of a narrow canyon
caused by interfering components.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
NAQCC 3535
K3-100 #508 / KX1  #1311



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