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Neurochrome Modulus-186: 40W (8Ω); 65W (4Ω) @ <-120dB THD Composite Amplifier Module
Neurochrome Modulus-186: 40W (8Ω); 65W (4Ω) @ <-120dB THD Composite Amplifier Module
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Old 17th October 2018, 06:12 PM   #1
tomchr is offline tomchr  Canada
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Arrow Neurochrome Modulus-186: 40W (8Ω); 65W (4Ω) @ <-120dB THD Composite Amplifier Module

Update 2018/10/20: The introductory sale has started: Modulus-186: 65W composite amplifier achieving <-120dB THD
The sale will end by 23.59 Mountain Time (GMT-7) on November 30th. This will be the only sale on the Modulus-186 so get 'em while you can.

Key features (preliminary):
  • Mono construction.
  • 40/65 W into 8/4 Ω, respectively @ THD < -120 dBc.
  • Tested for stability with reactive loads up to 1.0 F || 8 Ω.
  • Multi-tone IMD residual: < -105 dBV.
  • Damping factor: >500 @ 1 kHz; >225 @ 20 kHz (8 Ω).
  • Integrated noise (20 Hz - 20 kHz): 17 V (A-weighted); 22 V (unweighted) @ 20 dB gain.
  • Integrated noise (20 Hz - 20 kHz): 23 V (A-weighted); 28 V (unweighted) @ 26 dB gain.
  • Balanced input (can be connected to unbalanced sources as well).
  • Default gain: 26 dB for ease of use with other HiFi components. 20 dB available upon request. Higher gain possible by a simple resistor swap.
  • Four-layer PCB, fully optimized for the highest performance.
  • Designed, manufactured, and assembled in Canada. All components sourced from reputable distributors (Mouser, Digikey, et al.)
  • Available for pre-order within the next few days with a significant early adopter discount. Expected in stock by the end of November, 2018, at which point the into sale will end.
The Modulus-186 is a composite amplifier, which uses an LME49720 to perform error correction on an LM3886 power amplifier. This results in an amplifier which has the precision of the LME49720 and the power of the LM3886. This error correction is the central point of the Neurochrome Modulus composite architecture. The composite design will correct for many types of error, including distortion and power supply induced errors. It is due to this architecture that the Modulus amplifiers achieve their high performance levels as evidenced by their ultra-low THD, IMD, multi-tone IMD, etc.

Note that attached picture and measurements are of the prototype. I will follow up with a more comprehensive set of measurements once the production version is in.
The production version will be Neurochrome Blue and professionally assembled in Calgary on a gold-plated PCB made in Ontario, Canada. The finished module will include aluminum mounting hardware (also made in Canada), which allows the module to be bolted directly onto a heat sink. This mounting method greatly simplifies the mechanical work for the the DIYer (only two holes needed with 0.5 mm precision in their location).

Enjoy.

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; 20th October 2018 at 08:13 PM.
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Old 17th October 2018, 07:36 PM   #2
tomchr is offline tomchr  Canada
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Damping factor and output impedance measurements.
Attached Images
File Type: png MOD186_PROTO_DampingFactor.png (61.2 KB, 91 views)
File Type: png MOD186_PROTO_OutputImpedance.png (60.7 KB, 66 views)
__________________
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; 17th October 2018 at 07:42 PM.
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Old 17th October 2018, 09:44 PM   #3
wcwc is offline wcwc  United States
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So Tom, would you expect better performance for the Mod186 vs. the Mod86?
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Old 17th October 2018, 09:48 PM   #4
poseidonsvoice is offline poseidonsvoice  United States
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Neurochrome Modulus-186: 40W (8&#937;); 65W (4&#937;) @ &lt;-120dB THD Composite Amplifier Module
Horn lovers, rejoice and unite! Beautiful

Sign me up for the 286 when it’s out!

Best,
Anand.
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Last edited by poseidonsvoice; 17th October 2018 at 10:04 PM.
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Old 17th October 2018, 10:11 PM   #5
poseidonsvoice is offline poseidonsvoice  United States
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Neurochrome Modulus-186: 40W (8&#937;); 65W (4&#937;) @ &lt;-120dB THD Composite Amplifier Module
Quote:
Originally Posted by wcwc View Post
So Tom, would you expect better performance for the Mod186 vs. the Mod86?
The answer lies in the custom SMD based input stage of the 186 (no more THAT 120X series) and lowered noise floor amongst other things along with the precision pretested modules.

Easy decision if you ask me and if the power is right for your application.

Best,
Anand.
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Last edited by poseidonsvoice; 17th October 2018 at 10:32 PM.
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Old 18th October 2018, 01:18 AM   #6
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by wcwc View Post
So Tom, would you expect better performance for the Mod186 vs. the Mod86?
Absolutely! As Anand pointed out, one of the main differences is the reduction in noise floor, thus the THD+N at 1 W, for example, is cut in half. The residual mains hum, which in the MOD86 is low already, has been reduced by at least 15 dB and is now firmly below the noise floor.

Another big change is that I get to serve the OEMs, makers, and less experienced DIYers much better. In the past, I built the Modulus modules by hand. That severely limits my ability to sell the finished modules in high volume. It simply takes me way too long to build them. Thus, by relying on automated assembly for the majority of the parts and hand-assembly (by my assembly house) I get to focus on growing my business - both to my benefit and to the benefit of everybody else.

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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Old 18th October 2018, 02:25 AM   #7
wcwc is offline wcwc  United States
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Anand,

Well I am in the middle of building 4xMod86’s to use on a LXmini, which I will use for a while. Longer term I was looking at building a pair of Mod686/Mod286 or Mod186 amps to use with the LXmini’s. I would repurpose the 4xMod86 to my surround system powering some full range drivers. Well I populated the resistors on all the Mod86 boards, now on to the diodes.
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Old 18th October 2018, 02:31 AM   #8
chris719 is offline chris719  United States
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Neurochrome Modulus-186: 40W (8&#937;); 65W (4&#937;) @ &lt;-120dB THD Composite Amplifier Module
Quote:
Originally Posted by tomchr View Post
Absolutely! As Anand pointed out, one of the main differences is the reduction in noise floor, thus the THD+N at 1 W, for example, is cut in half. The residual mains hum, which in the MOD86 is low already, has been reduced by at least 15 dB and is now firmly below the noise floor.

Another big change is that I get to serve the OEMs, makers, and less experienced DIYers much better. In the past, I built the Modulus modules by hand. That severely limits my ability to sell the finished modules in high volume. It simply takes me way too long to build them. Thus, by relying on automated assembly for the majority of the parts and hand-assembly (by my assembly house) I get to focus on growing my business - both to my benefit and to the benefit of everybody else.

Tom
Is the LME49720 used to avoid the pole-zero compensation of the OPA1611 I think you used on the Mod 86? Looks excellent as usual .
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Old 18th October 2018, 02:44 AM   #9
tomchr is offline tomchr  Canada
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Quote:
Originally Posted by wcwc View Post
I would repurpose the 4xMod86 to my surround system powering some full range drivers.
That'd be a nice amp for the surround channels.

Quote:
Originally Posted by chris719 View Post
Is the LME49720 used to avoid the pole-zero compensation of the OPA1611 I think you used on the Mod 86? Looks excellent as usual .
Yep. The LME49720 offers quite a few nice features. Among them:
  • Very low distortion.
  • Single-pole response to UGBW.
  • Reasonably low noise.
  • Decent offset specs.
  • Lowish cost.
I like it.

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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Old 18th October 2018, 02:43 PM   #10
Spring Halo is offline Spring Halo  United States
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Will you be offering bare PCBs to those of us who are comfortable with SMD soldering?
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