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Brian Donegan  
#1 Posted : Thursday, December 7, 2006 8:29:32 PM(UTC)
Brian Donegan

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So, there had been some talk about using the PGA2310 with the Kook instead of of the PGA2311, because of it's higher rails and (therefore) greater voltage swing (headroom). We chose the 2311 because of it's better specs and outstanding performance, but, sounded like fun. So, I had a little while to play last night and modded an older Kook board I had lying around.

UserPostedImage

The basic mod is easy. The 2310 is pin compatible with the 2311, so just plop it in there. You also want to supply the analog side of the 2310 with +-12V, rather than +-5V. You still need +5V for the Pic and the digital side of the 2310. This can be accomplished by removing the LM7905 vreg, cutting one trace, and adding two small jumpers on the bottom of the board.

Cut trace (between LM7805 and C4):
UserPostedImage

Jumpers (from C17(+) to C4(+) and from C18(+) to C3(+)):
UserPostedImage

For the newer boards, the jumpers are in a slightly different spot due to the minor layout changes, but same components...

Here are the jumper spots:
UserPostedImage

And the trace to cut:
UserPostedImage

Share and enjoy!



Edited by user Friday, July 16, 2010 5:29:46 AM(UTC)  | Reason: Not specified

Sphynxz  
#2 Posted : Friday, December 15, 2006 3:22:18 PM(UTC)
Sphynxz

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So what is the result? How does Kook sound with PGA2310?
Cheers!

Dmitry.
Russ White  
#3 Posted : Friday, December 15, 2006 3:41:23 PM(UTC)
Russ White

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Sphynxz wrote:
So what is the result? How does Kook sound with PGA2310?


It sounds virtually identical, but there is the distinct advantage of being able to swing more voltage. So if you have a hot source, or some pro gear that swings 10V its a very good mod. Also, some headphones would benefit as well.

Cheers!
Russ
Sphynxz  
#4 Posted : Saturday, December 16, 2006 9:25:29 PM(UTC)
Sphynxz

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What types of headphones would benefit from this mod? Do you think it will make a difference to my Etymotic ER-4s?
Cheers!

Dmitry.
Russ White  
#5 Posted : Saturday, December 16, 2006 9:33:51 PM(UTC)
Russ White

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Sphynxz wrote:
What types of headphones would benefit from this mod? Do you think it will make a difference to my Etymotic ER-4s?


To be honest, I am not familiar with them. I read the spec sheet. They have a fairly high impedance (high impedance cans like high voltage), but they are also pretty sensitive. With 3vrms continuous max power, the regular PGA2311 should drive it fine.

Cans like Sen. HD600 which have a high impedance do well with the mod. It does fine with the regular PGA2311 too, but it will go substantially louder with the PG2310.

Cheers!
Russ
Sphynxz  
#6 Posted : Saturday, December 16, 2006 10:11:49 PM(UTC)
Sphynxz

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Thanks for the answer!
Cheers!

Dmitry.
anbello  
#7 Posted : Friday, July 16, 2010 1:10:20 AM(UTC)
anbello

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Location: Italy

Hi Brian,
is it possible to see again the images on the first post?

Thanks
Andrea
Brian Donegan  
#8 Posted : Friday, July 16, 2010 5:30:56 AM(UTC)
Brian Donegan

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I just updated the links.
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