[Elecraft] K2 Audio plague

Don Brown [email protected]
Mon Sep 16 18:43:00 2002 

Hi

Soldering a capacitor to pin 1 of the LM380 Will do nothing. The pin is n=
ot connected to anything inside the IC. It is marked NC on the schematic =
and in the National data book.

Don Brown
KD5NDB
----- Original Message -----
From: [email protected]
Sent: Monday, September 16, 2002 3:48 PM
To: [email protected]
Cc: [email protected]
Subject: Re: [Elecraft] K2 Audio plague

Daniel, KG4DNL wrote:

"3 things that I know of that could majorly cut back your audio:

1. bad audio amp or hanging pin on it (might want to try the capacitor on
it)

2. wires switched on speaker jack

3. Windings and appropriate wire sizes on all torroids.  I found that L33
on the RF board of my K2 needed to be rewound with #28 AWG wire instead
of #26 AWG wire size. And that also all the other torroids after L33 in
the book all through RFC3 were wound with #28 instead of #26."
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Since the speaker jack is wired correctly and the AWG size of wire used
on the toroids is correct (as specified in the assemby manual), only item
#1 above applies to my K2.

The next time I open up my K2, I'll solder a decoupling capacitor from
pin 1 of U9 on the control board to ground as suggested by Pete (PE1MHO -
G7ECN) and see if that increases my audio output.

After doing the "scratchy" AF pot mod, there may be one or two other
floating pins on U9.  If so, I'll have to look into the circuit and
figure out how to handle that.

73, de Earl, K6SE
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