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"The Wire" Ultra-High Performance Headphone Amplifier - PCB's
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Old 30th October 2018, 02:31 AM   #2681
sgrossklass is offline sgrossklass  Germany
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Quote:
Originally Posted by N Brock View Post
There is also a lot of noise when power and audio are both supplied from the same device, probably a ground loop.
Correct. It's an inherent problem, USB power + unbalanced audio from the same source just do not mix. You get audio ground + USB power ground which are connected on both sides, there's your problem. Needs galvanic isolation somewhere, usually easiest provided by an extra USB charger (preferably the non-lethal variety, the cheapest one found on AliExpress may not qualify).

If the linear regs do not work, consider hacking in some discrete capacitance multipliers instead. If you weren't shooting for something so small, I'd even give an RC filter of maybe 10 ohms and several hundred F (as much as you can fit) a shot.
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Old 4th November 2018, 10:31 AM   #2682
WoodyLuvr is offline WoodyLuvr  Thailand
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Quote:
Originally Posted by N Brock View Post
...There is also a lot of noise when power and audio are both supplied from the same device, probably a ground loop. I hope to fix this when I re-do the power supply section...

...This design is USB powered. There's a DC-DC converter that will supply +/- 9V. Linear regulators make the final supply +/- 8V. Power output is limited by the supply. The converter I chose is 2 watts and there is approximately 100 mA drive current available. Theoretically the amp will deliver up to 80 mW / ch into 32 ohms, 282 mW /ch into 113 ohms, and 53 mW / ch into 600 ohms. Below 113 ohms it's current limited, above 113 ohms it's voltage limited...
Quote:
Originally Posted by sgrossklass View Post
Correct. It's an inherent problem, USB power + unbalanced audio from the same source just do not mix. You get audio ground + USB power ground which are connected on both sides, there's your problem. Needs galvanic isolation somewhere, usually easiest provided by an extra USB charger (preferably the non-lethal variety, the cheapest one found on AliExpress may not qualify).

If the linear regs do not work, consider hacking in some discrete capacitance multipliers instead. If you weren't shooting for something so small, I'd even give an RC filter of maybe 10 ohms and several hundred F (as much as you can fit) a shot.
Have you considered using two separate usb cables... one for power and one for data/audio?


In my build I separated the data(audio) and power lines and it has been deadly silent... absolutely no ground loop noise issues to speak of. I used a basic DIY two wire USB 2.0 power charge cable to supply power to the RECOM DC-DC Converter and a second separate 3.5mm trs line out audio cable from my motherboard to my amp's input jack.
Click the image to open in full size.


Here is another idea from agdr Audio that you might mull over to give you some ideas:
Switching Split Power Supply 12V 500mA Split Supply
Non-Conductive Panel Mount 2.1mm DC Barrel Jack
Click the image to open in full size.
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Last edited by WoodyLuvr; 4th November 2018 at 10:43 AM.
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Old 7th December 2018, 11:57 AM   #2683
TheFrullip is offline TheFrullip
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Are these PCB's still available? If not, is it possible to assemble this amp on a perf board?
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Old 16th February 2019, 08:39 AM   #2684
eimis is offline eimis  Europe
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Originally Posted by TheFrullip View Post
Are these PCB's still available? If not, is it possible to assemble this amp on a perf board?
Also interested, but seems like this is dead so I'll route a single pcb with PSU V2 + SE-SE on it
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Old 16th February 2019, 08:44 AM   #2685
UrSv is offline UrSv  Sweden
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I have an assembled SE-SE board and an assembled PSU board available.
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Old 4th May 2019, 04:47 AM   #2686
sealand1 is offline sealand1  United States
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Also interested.
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Old 4th May 2019, 05:16 AM   #2687
UrSv is offline UrSv  Sweden
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Originally Posted by UrSv View Post
I have an assembled SE-SE board and an assembled PSU board available.
Sold.
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Old 4th May 2019, 08:14 AM   #2688
eimis is offline eimis  Europe
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"The Wire" Ultra-High Performance Headphone Amplifier - PCB's-wwg-jpg
I'll have these boards soon.
This is PSU V2 + SE-SE on a single PCB.
I omitted the input resistors (R13, R14, R17, R18) as I'll be hooking up a nice pot directly to the opamp.
I also added a 1x-3.86x gain switch.
Let me know if you'd like one.
Attached Images
File Type: jpg wwg.jpg (281.6 KB, 374 views)

Last edited by eimis; 4th May 2019 at 08:18 AM.
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Old 12th June 2019, 12:11 AM   #2689
nanchangbob is online now nanchangbob  United States
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Default I'm came to the party late but wow!

I've been using the power supplies for a number of years but I didn't finish the two SE-SE boards until this week. I built two of them and they work great, I housed one of them with the wire power supply board.

I've been listening to it for the last two days and I'm very happy. Truly non-fatiguing and a delight to listen to. I really don't want to put down my headphones, I have a bunch of headphone amps and wasn't in any hurry. However, I'm happy I pulled these boards out and finished putting them together.

Those tiny resistors were challenging for my old eyes. I used a 25K dale stepped attenuator that I built, I didn't look at which value you suggested but this one seems a nice fit and I had it laying around.

Thank you for your effort, Owen, too bad they stopped production of some of the chips, I think a lot more people would have really enjoyed these. I still have a BAL-BAL board and the chips, someday I will get around to building it.
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Old 12th June 2019, 11:43 AM   #2690
mwmkravchenko is offline mwmkravchenko  Canada
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"The Wire" Ultra-High Performance Headphone Amplifier - PCB's
If anyone wants boards I have 4 pcs from the original run.
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