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#1 |
diyAudio Member
Join Date: Feb 2009
Location: Calgary
|
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World, I present to you the All-DIY Neurochrome HP-2 ultra-low distortion headphone amp.
I will be demoing it tomorrow (Sunday Nov. 10, 2019) at the Burning Amp Fest at Ft. Mason. If you're in San Francisco, please stop by for a demo and chat. Key features of the HP-2:
Build budget:
Spec. highlights:
You can find the circuit description and full specifications on my website: Neurochrome HP-2. But, but... What does it sound like? I like it, obviously. Ever since I heard my first precision amp, I've been hooked on the precise (i.e. ultra-low distortion) sound. I prefer that the amp makes as little contribution to the sound as possible, as I believe this allows for experiencing the music the way the artist and recording engineers intended it. The precision of the HP-2 allows it to provide realistic and natural rendition of the source material, with a wide and open sound stage (even in headphones!). The HP-2 will only be available as a DIY product, i.e. I will not be offering it in a fully assembled option. The PCB features two surface mounted components. They're relatively easy to solder 8-pin SOICs. Should you wish to have me solder those ICs for you, I can do that for a small fee. In addition to the PCB, I offer a nice aluminum chassis, which has been custom designed for the HP-2. The chassis is a very nice option for DIYers who would like to showcase their builds in the form of a professional-looking product. I am offering the HP-2 at pre-order prices until they arrive in stock or until the first ten HP-2s have sold (whichever occurs first). You can buy your HP-2 here: Neurochrome HP-2. Thanks, Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886. Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right Last edited by tomchr; 9th November 2019 at 07:56 PM. |
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#2 |
diyAudio Member
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Superb! Can’t wait to listen to it!
Best, Anand.
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Science is not a democracy - Earl Geddes DIYAudio is a journey not a destination! |
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#3 |
diyAudio Member
Join Date: Feb 2015
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Measures better than a "The Wire BAL-BAL", but given the transparency of the BAL-BAL already I doubt I would ever notice a difference with existing direct coupled HD800.
One area I would suggest in the next version is a true differential output, many who would spend that much for a HP amp would already have an existing 4 pin rig.
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Soekris dam1021-12v2 dual-mono balanced w/D882/B772 transistor mods & BAL-BAL Headamp: https://imgur.com/gallery/RVBQozq nc400: https://imgur.com/iORCyna | TT2USB: https://imgur.com/a/p6OiS | HD800 | KEF R300 |
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#4 |
diyAudio Member
Join Date: Feb 2009
Location: Calgary
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You can build the HP-2 with the following outputs:
There's only a minuscule benefit of using the 4-pin connector. You get ever so slightly better channel separation as you do not have the shared ground connection in the 4-pin connector. Some will argue that a balanced amp will provide lower distortion due to the cancellation of harmonics. That's true in a high-distortion design. The cancellation doesn't work well for low-distortion amplifiers. In fact, any sort of cancellation scheme is much more likely to degrade the performance of a low-distortion amp than to improve it. Even in the cases where the THD is reduced by such cancellation, the cancellation mostly affects the even order harmonics – the ones most find pleasant sounding – while leaving the odd order harmonics (that many find to sound harsh) in place. Tom
__________________
Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886. Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right |
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#5 |
diyAudio Member
Join Date: May 2019
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No block diagram (yet) on your site, like the HP1 .
HP-2 – Neurochrome How do you go from the 28Vdc to a + and - supply ? It's LME49720 + 2 paralleled OPA1656 with an AC coupled output, so a capacitor at the output . mmm... Output Impedance 2.6 Ω ? Pretty high... |
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#6 |
diyAudio Member
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You would be speculating based on no data?
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bel |
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#7 |
diyAudio Member
Join Date: Feb 2009
Location: Calgary
|
Correct. I need to proofread about half the verbiage as well. 24 hours/day one person kinda thing. I just got caught up after returning from BAF.
I don't. Hence, the output cap. I use nested feedback to eliminate the THD of the output cap. It works rather well. Meh... Does it matter? I agree that it won't look as good on Amir's ranking plots on Audio Science Review, but it will certainly work well (as my data show). Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886. Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right |
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#8 |
diyAudio Member
Join Date: Feb 2009
Location: Calgary
|
And now... A block diagram.
I have one PCB left at the intro price. Tom
__________________
Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886. Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right |
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#9 |
diyAudio Member
Join Date: Dec 2016
Location: Huntington Beach, CA
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Would there be any issues using HP-2 as a preamp as well?
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#10 |
diyAudio Member
Join Date: Feb 2009
Location: Calgary
|
That will be fine. If you use a switched output connector, you can just take the preamp output on the switched side. That way, the preamp out is turned off when you plug in the headphones.
Tom
__________________
Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886. Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right |
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