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Low cost, high performance headphone amp using OPA1656 and LMH6321
Low cost, high performance headphone amp using OPA1656 and LMH6321
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Old 9th November 2020, 10:56 AM   #51
levistubby is offline levistubby  United Kingdom
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I'd take a board if there is a second run.
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Old 10th November 2020, 01:47 AM   #52
tompa909 is offline tompa909  Canada
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I'm interested in a second run as well.
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Old 15th November 2020, 05:05 AM   #53
GKTAUDIO is offline GKTAUDIO  United States
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I have been using this almost every day to listen to one or two albums a day, and a variety of genres. Just listened to Gregory Porter's new album, sounded fantastic.
Great job, Wyn.
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Old 15th November 2020, 08:20 PM   #54
wynpalmer2 is offline wynpalmer2  United States
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Quote:
Originally Posted by tompa909 View Post
I'm interested in a second run as well.
As of this time there are only three interested parties- not enough to order a new batch.
I'll post again when enough interest exists.
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Old 24th November 2020, 10:49 PM   #55
cowanaudio is offline cowanaudio  Australia
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Low cost, high performance headphone amp using OPA1656 and LMH6321
I've had a successful build as well, constructed according to the BOM except for the feedback resistor which I increased to 1K to up the gain a little. I'll be driving 250R DT880s with this amp from an LG VG30 source so I may need to raise the gain a little more.

I had some concern about soldering the DPAKs but it was straightforward in practice. Good cleanliness, a little flux and a large tip in the iron made for a simple job.

Low cost, high performance headphone amp using OPA1656 and LMH6321-headphone-amp-3-jpg

Low cost, high performance headphone amp using OPA1656 and LMH6321-headphone-amp-2-jpg

Low cost, high performance headphone amp using OPA1656 and LMH6321-headphone-amp-jpg


I have a chassis coming on the slow boat from China. The headphone amp will live with a Khozmo attenuator and a DRV134 balanced line driver in this chassis to provide a simple but very high quality preamp function.

Thanks again Wyn for making these boards available to a lucky few. It might make your job easier in future if you were willing to share the layout files so interested builders can get their own boards fabricated.
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File Type: jpg Headphone Amp-2.JPG (262.3 KB, 534 views)
File Type: jpg Headphone Amp-3.JPG (229.6 KB, 318 views)
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Last edited by cowanaudio; 24th November 2020 at 10:54 PM.
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Old 24th November 2020, 11:48 PM   #56
GKTAUDIO is offline GKTAUDIO  United States
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Nice job! I had also considered a Khozmo attenuator, but didn't consider the balanced line driver because I'm building another WP preamp with the headphone amp built in.
It's always a bit of a drag waiting for chassis to arrive!
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Old 27th November 2020, 02:48 PM   #57
wynpalmer2 is offline wynpalmer2  United States
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I'd post the Gerbers except that there are almost enough interested parties that a larger build is justified, and I'm still hoping for more conversation on the design itself.
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Old 28th November 2020, 05:04 PM   #58
dfreemansc is offline dfreemansc  United Kingdom
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I’d be interested in a board.
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Old 28th November 2020, 07:48 PM   #59
wynpalmer2 is offline wynpalmer2  United States
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There is, seemingly, sufficient interest for a second run.
Would anyone interested please confirm with a PM?
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Old 28th November 2020, 11:42 PM   #60
wynpalmer2 is offline wynpalmer2  United States
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The boards have been ordered and will arrive in c. 5 days.
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