[Elecraft] K3 headphones

[Brett Howard]

Where are these caps?  I see them on page 28 of 52 on the schematics but
where do they physically live in the unit.  I assume they are on the main
DSP board.  Also as far as the "grounded 1uF cap" are you talking about the
lil decoupling nugget they had sitting there?  Guess it couldn't hurt...  

Your pictures say after AF and IF amplifier modifications.  What IF mods did
you make?
 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Alexander Ponomarenko
Sent: Tuesday, June 23, 2009 12:16 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 headphones

I has tried replacing the 10uF caps with 100uF in AF-amp, also in
data-sheet for LM4811MM we see grounded pin 10 have to add for 1uF cap. 
The result is excellent with my ProSet.
Sound clean and deep. Signals became more raised, proturberant, appeared
"body of the sound", clearly differ the most small details in signals. 
Such sensation, that earlier the signals got through blanket,
but now here is they, straight before my eyes, and they proturberant and
volumetric.
As my ears as SpectroLab also "sees the difference". You can see my
plots "before" and "after" same mods.

before mods:   http://forum.cqham.ru/download.php?id=43281
after mods:  http://forum.cqham.ru/download.php?id=43282

before s9 level:  http://forum.cqham.ru/download.php?id=43279
after s9 level:  http://forum.cqham.ru/download.php?id=43280

73! Alex UR5LAM

Joe Subich, W4TV:
>> K9AC has recommended replacing the 10 uF caps 
>> with 220 uF caps which would reduce the corner frequency 
>> for low impedance headsets to about 50 Hz but since my 
>> primary headset is the Proset I have not tried it as yet. 
>>
>> 73, 
>>
>>    ... Joe, W4TV
>>     

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