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Old 11th November 2013, 06:55 PM   #141
opc is offline opc  Canada
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Hi Guys,

As a general update, all the boards are up and running, and in spite of the fact that I didn't think there was much room for improvement with The Wire series, the new PSU has really brought overall performance up to whole new level.

The TPS7A3301 regs aren't just a little better than the old LM3XX series regs, they are roughly an order of magnitude better. The FFT of the PSU output is better looking than the output of most actual headphone amplifiers, which is really cool

This improvement trickles through to the performance of the SE-SE and BAL-BAL amplifiers by way of lower noise, better crosstalk, and improved startup and shutdown characteristics.

The supply improvements on the LPUHP have also been very beneficial from a noise standpoint, but even more from a startup and shutdown behavior perspective. The original LPUHP had a bit of a transient at startup and shutdown, which has been completely eliminated with the new regulator setup. The symmetrical positive and negative regulators have exactly the same startup and shutdown times, which is the reason for the improvement.

I've got tonnes of info to post, so this will take a few posts to get through. I'll break down the pictures and results by board, starting with the PSU.

Once all the boards and test results are posted here, I will be sending out payment requests to everyone on the main list. Expect to start seeing them this evening!

Cheers,
Owen
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Old 11th November 2013, 07:12 PM   #142
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So, for current owners of the SE-SE, BAL-SE and BAL-BAL, the new PSU will make a worthwhile upgrade

Looking forward to seeing how the new offerings fair

Paul
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Last edited by BuildMeSomething; 11th November 2013 at 07:15 PM.
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Old 11th November 2013, 07:26 PM   #143
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Me want
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Old 11th November 2013, 08:36 PM   #144
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Default PSU

PSU Results:

Below are a few pictures of the fully built PSU and an FFT of the output of the positive rail (both rails are identical).

The overall noise floor is roughly 10-12dB lower than the LM3XX regulators, and the rectification fundamental and harmonics are as much as 30dB lower!

Although it's not shown the output impedance is also quite a bit lower, giving improved load regulation.

Also attached below is the complete BOM for building the PSU. The BOM is very comprehensive, so it's worth reading it over to make sure you actually need everything on the list.

It's also worth noting that if you guys arrange a group buy for these parts, the total cost could be reduced by about half.

More to come!
Attached Images
File Type: png New PSU.png (65.7 KB, 733 views)
File Type: png Old PSU.png (68.0 KB, 708 views)
File Type: jpg IMG_9160.JPG (201.0 KB, 723 views)
File Type: jpg IMG_9161.JPG (164.1 KB, 700 views)
File Type: jpg IMG_9203.JPG (174.4 KB, 682 views)
File Type: jpg IMG_9204.JPG (189.2 KB, 278 views)
File Type: jpg IMG_9202.JPG (203.7 KB, 328 views)
Attached Files
File Type: pdf PSU BOM.pdf (27.9 KB, 258 views)
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Old 11th November 2013, 08:53 PM   #145
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Default SE-SE

On to the SE-SE

There is minimal overall change on this board, meaning the old BOM and build thread is still applicable:

"The Wire" Headphone Amp Build Wiki - diyAudio

I haven't measured the old and new board with the new PSU, but I don't expect any meaningful differences between them. The only change is the addition of another full layer ground plane, which may help to slightly improve crosstalk and slightly reduce noise, but I haven't directly compared the two.

All the improvements shown in the measurements below are a result of the better PSU.

Also note that all THD measurements are limited by the AP output generators, and not by the headphone amp itself.

Pictures to follow.
Attached Images
File Type: png FFT Spectrum Monitor - OUTPUT AP INPUT.png (105.4 KB, 331 views)
File Type: png FR 2VRMS.png (66.2 KB, 103 views)
File Type: png FFT Spectrum Monitor 4vrms 50R.png (107.9 KB, 108 views)
File Type: png Distortion Product Ratio 4VRMS.png (50.1 KB, 111 views)
File Type: png THD Ratio 4VRMS.png (73.7 KB, 91 views)
File Type: png Signal to Noise Ratio 2VRMS.png (46.8 KB, 82 views)
File Type: png Signal to Noise Ratio 7.2VRMS.png (46.2 KB, 77 views)
File Type: png DC OUTPUT - AP input.png (80.9 KB, 75 views)
File Type: png THD Ratio v freq 4vrms.png (61.5 KB, 77 views)
File Type: png SE-SE OUTPUT IMPEDANCE.png (59.6 KB, 82 views)
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Old 11th November 2013, 08:56 PM   #146
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Default SE-SE Pictures

See attached for pictures and more measurements of the complete SE-SE
Attached Images
File Type: png DFD Distortion Product Ratio 4VRMS IMD 80-12.5k.png (43.5 KB, 92 views)
File Type: png MOD Distortion Product Ratio 4VRMS IMD 60-7k 4 to 1.png (49.1 KB, 70 views)
File Type: png SMPTE Distortion Product Ratio 4VRMS IMD 60-7k 4 to 1.png (54.9 KB, 62 views)
File Type: png THD Ratio v level.png (74.2 KB, 73 views)
File Type: jpg IMG_9199.JPG (236.9 KB, 222 views)
File Type: jpg IMG_9200.JPG (242.4 KB, 278 views)
File Type: jpg IMG_9201.JPG (207.7 KB, 246 views)
File Type: jpg IMG_9229.JPG (380.9 KB, 234 views)
File Type: jpg IMG_9230.JPG (373.0 KB, 217 views)

Last edited by opc; 11th November 2013 at 09:07 PM.
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Old 11th November 2013, 09:05 PM   #147
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Default BAL-BAL

All the same comments made above for the SE-SE apply to the BAL-BAL variant as well. The BOM is the same and the Wiki link above is also the same.

There is a newer measurement for the BAL-BAL which is labelled as "crosstalk". The actual crosstalk should be the driven channel level minus the undriven channel level, which is roughly 134dB of channel separation.

This was measured driving a 50 ohm load with both channels sharing a single PSU. I don't think there's much point in running the BAL-BAL with a dual PSU, unless you just like the idea of it

Pictures to follow...
Attached Images
File Type: png Output Level - No Input dBV.png (41.2 KB, 168 views)
File Type: png FR - 2VRMS.png (66.2 KB, 55 views)
File Type: png FFT 4VRMS.png (106.2 KB, 66 views)
File Type: png Distortion Product Ratio 4VRMS.png (50.7 KB, 67 views)
File Type: png THD Ratio 5VRMS.png (73.3 KB, 51 views)
File Type: png Signal to Noise Ratio 2VRMS.png (46.8 KB, 47 views)
File Type: png Signal to Noise Ratio - 14.4VRMS.png (46.5 KB, 46 views)
File Type: png THD Ratio v Freq.png (62.7 KB, 55 views)
File Type: png BAL-BAL OUTPUT IMPEDANCE.png (57.8 KB, 51 views)
File Type: png Crosstalk.png (46.4 KB, 52 views)
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Old 11th November 2013, 09:10 PM   #148
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Default BAL-BAL

And a few more...
Attached Images
File Type: png DC OFFSET - No Input.png (72.5 KB, 59 views)
File Type: png DFD Distortion Product Ratio 4VRMS IMD 80-12.5k.png (43.5 KB, 41 views)
File Type: png MOD Distortion Product Ratio 4VRMS IMD 60-7k 4 to 1.png (49.1 KB, 35 views)
File Type: png SMPTE Distortion Product Ratio 4VRMS IMD 60-7k 4 to 1.png (54.9 KB, 35 views)
File Type: png THD Ratio v level.png (74.2 KB, 48 views)
File Type: jpg IMG_9195.JPG (268.6 KB, 180 views)
File Type: jpg IMG_9196.JPG (249.9 KB, 199 views)
File Type: jpg IMG_9197.JPG (257.1 KB, 163 views)
File Type: jpg IMG_9198.JPG (263.1 KB, 165 views)
File Type: jpg IMG_9228.JPG (371.0 KB, 184 views)

Last edited by opc; 11th November 2013 at 09:12 PM.
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Old 12th November 2013, 02:09 AM   #149
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Default LPUHP V2

Next up is the LPUHP V2 which underwent a bit of a redesign for the power supply and regulators, and has an improved heatsinking arrangement for the output stage.

I have attached all the usual measurements, as well as a new BOM to cover all the changes from V1.

The noise floor is significantly lower compared to V1, and with a larger transformer (50VA to 100VA) you will get a little more output power before clipping. These measurements can be compared to the original ones in the first LPUHP thread.

There are some notes in the BOM worth reading. If you want to build the SE input variant, you need to omit the first two op-amps and their associated parts, and re-select the resistors to get the gain you want for the remaining stage. I'll elaborate on this later in a proper Wiki.

The heatsink for the output stage is not absolutely needed. If you lift the BW pin on the output buffers and don't run a high duty cycle, then you probably won't need a heatsink.

The heatsink in the BOM does not look like the one in the pictures. Neither DK nor Mouser carry that particular heatsink, but you can get one from Newark if you like the way it looks

241214B91200G - AAVID THERMALLOY - HEAT SINK | Newark

There are also much cooler looking ones if you want to add some "bling":

Online Catalog - DCC - DCC60S

Heat Sinks for Surface Mount Devices ? Overview - Cool Innovations

The design is intended for a "half brick" size heatsink so anything compatible with that should work as long as you get the orientation right!

Finally, there is a little bit of bad news. There was a copper to copper short on the bottom of these boards that didn't get caught in DRC for some reason, so I will need to make two small cuts on each board to fix the short. I will perform this small fix on each board, and test each one to ensure it's good to go. There will, however, be two small nicks in the bottom of each board so if you're fussy about looks and want to cancel your order, then please adjust accordingly. You can see the cuts in the pictured provided if you look closely by the first pair of output stage bypass caps.

Last up is the high power lateral FET amp!
Attached Images
File Type: png FFT Spectrum Monitor - 50R input.png (102.4 KB, 166 views)
File Type: png FR - 1W.png (66.1 KB, 65 views)
File Type: png FFT Spectrum Monitor 1W.png (112.1 KB, 73 views)
File Type: png Distortion Product Ratio 4VRMS out.png (50.6 KB, 80 views)
File Type: png THD Ratio 5VRMS OUT.png (40.8 KB, 63 views)
File Type: png Signal to Noise Ratio 1W.png (47.0 KB, 56 views)
File Type: png Signal to Noise Ratio 15W.png (46.5 KB, 48 views)
File Type: png THD Ratio v freq.png (61.7 KB, 67 views)
File Type: png THD Ratio vs output power 8R zoom.png (51.1 KB, 65 views)
File Type: png LPUHP OUTPUT IMPEDANCE.png (55.4 KB, 69 views)
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Old 12th November 2013, 02:14 AM   #150
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Default LPUHP V2

More LPUHP images and measurements
Attached Images
File Type: png DC offset 8R AP input.png (91.5 KB, 83 views)
File Type: png DFD Distortion Product Ratio.png (43.0 KB, 70 views)
File Type: png MOD Distortion Product Ratio.png (49.3 KB, 55 views)
File Type: png SMPTE Distortion Product Ratio.png (54.2 KB, 59 views)
File Type: jpg IMG_9165.JPG (217.9 KB, 160 views)
File Type: jpg IMG_9166.JPG (200.5 KB, 173 views)
File Type: jpg IMG_9167.JPG (188.9 KB, 138 views)
File Type: jpg IMG_9168.JPG (220.2 KB, 148 views)
File Type: jpg IMG_9169.JPG (201.6 KB, 137 views)
File Type: jpg IMG_9170.JPG (217.8 KB, 233 views)
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