Joachim Gerhard Filter Buffer for ES9022 - Page 63 - diyAudio
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Old 27th June 2013, 01:48 PM   #621
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Old 28th June 2013, 08:58 PM   #622
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Can this filter work with ak4399 ?
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Old 29th June 2013, 03:32 AM   #623
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It can in principle work for any DAC which has an output impedance of 240 ohm or smaller, and has already a first order low pass filter of 100~150kHz.


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Old 28th October 2013, 01:00 AM   #624
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Quote:
Originally Posted by voxxonline View Post
Can this filter work with ak4399 ?
I built my last JG today for use with an I2SOverUSB XMOS/AK4396 stack. I've been playing around with the best possible performance for a reasonable cost in a slimline case. I built a few Salas BIB's to power the USB/Reclocker/DAC. AK just has a reconstruction filter on it, but even with that it sounded pretty darn good.

Just needed a bit more slam, sparkle, etc. Enter the JG. Power is modest (using a 'Wire' bipolar PS), but it really elevated the AK in this stack to the point where I'm good casing it up. If I had the room, I probably couldn't resist a a couple of Sala's to power the JG. :-) It never ends.

It's amazing to me how far things have come in the last couple of years. My first BII with an exaU2I didn't handle DSD, and cost me ~$1,000 - with basic TP power supplies, etc.

All in, I probably have <$500 into to this DAC, which is half the size, handles DSD and frankly sounds better (no slam on TP; solid kit).

I ramble. Short story - JG worked very well with this AK.
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Old 28th October 2013, 04:52 PM   #625
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Old 29th October 2013, 04:30 PM   #626
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Greg requested a photo. Here it is as a work in progress. Casing is tight, so components don't have the separation I'd like them to have. Sonically, the Salas shunts perform better with each their own transformers. Cabling isn't done by any means.
Click the image to open in full size.
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Old 31st October 2013, 01:32 AM   #627
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Very nice... thanks for sharing!

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Old 10th December 2013, 10:53 PM   #628
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Hello, are these still available?

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Old 11th December 2013, 03:49 AM   #629
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Very limited, but yes.
It will take time for Gogowatch to reply as he is extremely busy with work.


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Old 21st December 2013, 06:32 PM   #630
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Finished my first JG Filter Buffer today and have it working with a temporary supply comprised of AA batteries. This was my first real SMD soldering job (with the tiny stuff), and it works like a charm.
I am using it piggy back-style after my Audiosector DAC (one of the latest with Bobken reg and full BG treatment) and as said powered by +- 9.75V of batteries for the moment. Next will be to build a nice battery supply with integrated charger to supply +-14.4V .
Soundwise it is a very noticeable step up... I am an only headphones guy and am doing my listening with a modded HD800. Music with the filter buffer has a lot more energy in it, tiny details are rendered like little acoustic events in a 3D space (for lack of better words) and realism in general is improved by a good margin.
I only had about 1 hour of listening so far but listening to some piano jazz (Lyle Mays: Lincoln reviews his notes) was simply stunning!
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