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Old 29th November 2011, 06:46 AM   #31
GLooP is offline GLooP  Bulgaria
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Join Date: May 2011
Dear Kawo,

Please accept my high regards for your finest craftmanship!

Are you planning on selling DIY kits or PCBs only?
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Old 29th November 2011, 04:02 PM   #32
kawo is offline kawo  China
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Dear GLoop,
Is there any good recommendations?Thankyou
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Old 2nd December 2011, 03:10 AM   #33
kawo is offline kawo  China
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Dear Gloop,
I think both DIY kits and PCBs inappropriate, because the manufacturing of this HPA-2 to use equipment help, so now is the product on ebay to sell better,Thankyou
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Old 2nd December 2011, 06:38 AM   #34
GLooP is offline GLooP  Bulgaria
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Dear Kawo,

Since we are an DIY forum, I think people around would be more interested in doing things on their own than having them already assembled.

One again - congratulations for you fine design!
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Old 7th December 2011, 03:42 AM   #35
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Location: Texas
Kawo,

Your design looks very professional. I'm also very pleased that you are using a Neutrik connector.

I do have one suggestion though... Have you considered using National Semiconductor LME49720 opamps? These might not be great for the application, however they have gotten excellent reviews.

LME49720 - Dual High Performance, High Fidelity Audio Operational Amplifier
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Old 7th December 2011, 01:45 PM   #36
kawo is offline kawo  China
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Thank you for your appreciation, in the HPA-2 can only be used on a single op amp, dual op amp can not be used with I being tested there ... OP07, OP37, PM1008, NE5534, AD844/883, A843BH, OPA627AP, OPA637SM . the best op-amp is OPA637SM, but with not enough on the HPA-2 stable, so the OPA627 is the preferred.
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Old 16th December 2011, 02:58 PM   #37
kawo is offline kawo  China
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OPA637SM sound very good, but unfortunately unstable in the HPA-2.
Attached Images
File Type: jpg DSC07191.JPG (411.0 KB, 201 views)
File Type: jpg DSC07194.JPG (405.8 KB, 192 views)
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Old 26th December 2012, 07:11 PM   #38
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I have looked on ebay and simply can't find this product for sale, do you have links?

Thanks
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Old 28th December 2012, 12:41 AM   #39
kawo is offline kawo  China
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Hi: bart_dood
This product is sold out,sorry. I will launch a very strong front instead.
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