K3 2010 schematic

[Jan Holmer SM6TUW]

Thanks! We have been waiting for this update.
Is there a K144XV shematic in the line?

73 Jan

[juergen piezo]

Hi Jan

Does this schematic update include all the DSP upgrades?

Why I ask is that I want to go get them professionally printed and laminated onto cardboard.  Its expensive to do this, so I want to be sure this will be the final schematic for a while.

I hate reading circuit diagrams on screen.

John

--- On Thu, 1/14/10, Jan Holmer SM6TUW <[hidden email]> wrote:

> From: Jan Holmer SM6TUW <[hidden email]>
> Subject: [Elecraft] [K3]  K3 2010 schematic
> To: [hidden email]
> Date: Thursday, January 14, 2010, 2:08 AM
>
> Thanks! We have been waiting for this update.
> Is there a K144XV shematic in the line?
>
> 73 Jan
> --
> View this message in context: http://n2.nabble.com/K3-2010-schematic-tp4391688p4391688.html
> Sent from the [K3] mailing list archive at Nabble.com.
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[KK7P]

> Does this schematic update include all the DSP upgrades?
>  

Yes.  It is a snapshot of the current state of the K3.

73,

Lyle KK7P
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[Brett Howard]

Any chance of getting the old one archived out there?  I didn't look too
terribly hard in the FTP server for it... But it would be nice to be
able to compare and see how the enhanced mic audio and what not are done
as the series 1uF caps from W9AC are still in place...  

I notice that there are some stars of some "recent changes" and some
notes of whats on different revisions but barring that on the DSP board
having a history would be nice.

~BTH

On Thu, 2010-01-14 at 07:15 -0800, Lyle Johnson wrote:

> > Does this schematic update include all the DSP upgrades?
> >  
>
> Yes.  It is a snapshot of the current state of the K3.
>
> 73,
>
> Lyle KK7P
> ______________________________________________________________
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> Post: mailto:[hidden email]
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[David Pratt]

In a recent message, Brett Howard <[hidden email]> wrote ...
>
>Any chance of getting the old one archived out there?  I didn't look too
>terribly hard in the FTP server for it... But it would be nice to be
>able to compare and see how the enhanced mic audio and what not are done
>as the series 1uF caps from W9AC are still in place...

You said it, Brett, you didn't look terribly hard - the old schematics
are out there...
http://www.elecraft.com/manual/K3%20Schematics.pdf
and
http://www.elecraft.com/manual/K3_Schematics_Oct2008.pdf

73
--
David G4DMP
Leeds, England, UK
------



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[gm3sek]

David Pratt wrote:

>In a recent message, Brett Howard <[hidden email]> wrote ...
>>
>>Any chance of getting the old one archived out there?  I didn't look too
>>terribly hard in the FTP server for it... But it would be nice to be
>>able to compare and see how the enhanced mic audio and what not are done
>>as the series 1uF caps from W9AC are still in place...
>
>You said it, Brett, you didn't look terribly hard - the old schematics
>are out there...
>http://www.elecraft.com/manual/K3%20Schematics.pdf
>and
>http://www.elecraft.com/manual/K3_Schematics_Oct2008.pdf
>

This link will list all Elecraft manuals, errata sheets and schematics
in simple date order. Newest releases are always at the top:
http://www.elecraft.com/manual/?M=D

This link does the same for the mods:
http://www.elecraft.com/K3/mods/?M=D


--

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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[Brett Howard]

Appreciate your time pointing me there. I work in this stuff all day and
sometimes I just get lazy. At least I was willing to admit I was such. ;)

Again thank you sir.

~Brett (KC7OTG)

On Jan 15, 2010 12:15 AM, "David Pratt" <[hidden email]> wrote:

In a recent message, Brett Howard <[hidden email]> wrote ...

> > > Any chance of getting the old one archived out there?  I didn't look
too > terribly hard in t...
You said it, Brett, you didn't look terribly hard - the old schematics are
out there...
http://www.elecraft.com/manual/K3%20Schematics.pdf
and
http://www.elecraft.com/manual/K3_Schematics_Oct2008.pdf

73
--
David G4DMP
Leeds, England, UK
------
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[P.B. Christensen]

> Any chance of getting the old one archived out there?  I didn't look too
> terribly hard in the FTP server for it... But it would be nice to be
> able to compare and see how the enhanced mic audio and what not are done
> as the series 1uF caps from W9AC are still in place...

Brett,

On Rev. D of the Main DSP Board, mic coupling cap C28 was increased from 0.1
uF to 1 uF.  On the alternate mic path, R24 and R26 were scaled from 1K to
10K while keeping C36/C37 at 1 uF.   A 10x scaling increase in series
resistance has the same net effect on the low-frequency turnover point as
does a 10x increase in series capacitance.

Line In was affected the same way with an increase at R18/R20 from 1K to 10K
while keeping 1uF of series capacitance.  The 10K + 1uF combination is good
for keeping circuit Z and low-end audio response reasonable while minimizing
SMT parts size and cost.

Paul, W9AC

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