Can someone explain to me exactly why the chip failed, and what the Audio
Protection Assembly is for ?
Tnx, Dick, W1KSZ
On 1/14/2014 10:21 AM, Dave Hachadorian wrote:
The speaker amp is U1 on the DSP Board. The IC is an LM4950TS. The
pins are very closely spaced, too close for me.
Elecraft now has an Audio Protection Assembly circuit board, Part
Number E850506 for $2.36 plus shipping.
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message----- From: Stewart
Sent: Tuesday, January 14, 2014 9:36 AM
To: Elecraft Reflector
Subject: [Elecraft] K3 - No speaker output
My K3's speaker audio seems to have gone West. Audio out of the
phones, but
nothing out of the internal speaker.
It happened when I was installing a new external speaker, a DSP
Desktop speaker
from BHI.
Having read some recent posts about the audio chip blowing up because
of using a
mono plug instead of a stereo one, I made sure that I used a the
correct one.
Following guidance in the K3 users manual I connected the speaker to
the LH
channel as I want to use my headset in stereo.
I also took the covers off and checked for the modification involving
470ohm
resistors. That mod was in place OK.
I switched the K3 and the speaker on and got audio from the speaker.
However,
when I advanced the AF gain on the K3 to about 12 o'clock there was a
pop and no
more speaker audio from the K3.
I have checked the BHI speaker with another rig and it works fine, so
my K3 has
developed a fault.
I can't believe how sensitive it is to damage in the audio output,
particularly
with the care I took to try and avoid this sort of thing happening....
As I am quite OK with SMD's I would appreciate advice on what to
change, where
to get it and how...
Not a happy bunny !
73
Stewart G3RXQ
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