[Elecraft] K2 audio output for digital modes

Sun Dec 7 01:11:00 2003

Number 3 could be:

Install the missing header on the RF board that gives you audio just before
the audio filter, and buffer it out to the mic connector.  I managed to slip
a small board with an LM380 in-between the front panel and control boards.
There is an unused hole on the control board that you can use to mount the
board.  You can then run the buffer output to the front panel board using a
single pin header connector to connect to the mic header. That way you can
still remove the control board without having to unsolder anything.  So far
it works just fine.  I used a similar amp circuit to that shown on the web
page that EA3BLQ built.  Basically an LM380 using balanced input and minimum
parts count.  A small trimpot on the output sets the level that my laptop is
happy with.

Ken WK6F

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Wim Dewilder
Sent: Saturday, December 06, 2003 9:19 PM
To: [email protected]
Subject: [Elecraft] K2 audio output for digital modes

Hi,

I'm looking for a way to get a fixed audio output to the microphone
connector
to connect my PSK and RTTY soundcard interface (it has isolation
transformers).

I would like to get some audio to the connector even if the AF gain is
tuned way down, and I still
like to have the headphone connector working.

I found 2 possibilities on the reflector and just want to run it by
people who tried it.

option 1)   get audio from  VOL 2 terminal of R3 on the Front Panel  board

option 2)  use a tap-off point on the KAF2 board  (which I don't have
but might consider
                 if it has such a point)

option3) ?????

thanks for the feedback
- K6TE  Wim  (K2 #3553)

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