SKU: 80056442933

Modulus-86

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Description

Modulus-86The Modulus 86 Rev. 3. 0 is a 60 W composite amplifier which uses error correction to provide world class performance. It requires no adjustments and is built using off the shelf parts. The Unpopulated PCB Option of the Modulus 86 has been discontinued. Instead I will focus on kits: Modulus 86 Stereo Kit and Modulus 86 10th Anniversary Stereo Kit. Technical Documentation Data SheetDesign Documentation Description Key Specifications Circuit Topology

The Modulus-86 Rev. 3.0 is a 60 W composite amplifier which uses error correction to provide world class performance. It requires no adjustments and is built using off-the-shelf parts.

The Unpopulated PCB Option of the Modulus-86 has been discontinued. Instead I will focus on kits: Modulus-86 Stereo Kit and Modulus-86 10th Anniversary Stereo Kit.

Technical Documentation

  • Description
  • Key Specifications
  • Circuit Topology
  • The Modulus-86 is optimized for ultra-low distortion. The result is a crystal clear and non-fatiguing sound that is revealing without being sterile. Due to the ultra-low noise floor of the Modulus-86, builders experience complete quiet between tracks even with high-sensitivity speakers. 

    Key Features

    • Mono construction: One Modulus-86 board per channel.
    • World class performance ensured by an error correction circuit with local, low-noise power supply regulators.
    • Power supply agnostic by design. High performance is attained with unregulated power supplies and with switch mode supplies.
    • Differential (balanced) input which eliminates hum and ground loop issues. Can be used with single-ended (unbalanced) sources as well.
    • Four-layer PCB optimized for minimum power supply and ground impedance by the use of copper planes and pours. All ground management is handled on the PCB.
    • On-board EMI/RFI input filter and ESD protection.
    • All through-hole construction with socketed ICs. 
    • Bill-of-materials includes a Mouser Electronics Project Link for ease of parts ordering. Parts cost: $50.

    Build difficulty (1-5): 2 (easy-to-moderate)

    All Neurochrome circuit boards are fully electrically tested by the manufacturer. The boards are gold plated, RoHS compatible, and are made in Canada.

    Modulus-86 Build Process

    To get a feel for what is involved in a Modulus-86 build, please view the build video below.

  • The graph below shows the THD+N vs output power for the Modulus-86 Rev. 3.0.

    The table below lists the key specifications for the Modulus-86 Rev. 3.0. For the full specifications, please see the data sheet on the Downloads tab.

    Parameter Value Notes
    Output Power 60 W 4 Ω, < 0.01 % THD+N
    Output Power 40 W 8 Ω, < 0.01 % THD+N
    THD

    -128 dBc

    (0.00004 %)

    40 W, 8 Ω, 1 kHz
    Multi-Tone IMD Residual

    ≤ -140 dB Ref.: 40 W

    AP 32-tone, 40 W, 8 Ω
    Total Integrated Noise and Residual Mains Hum 13.7 µV RMS 20 Hz - 20 kHz, A-weighted
    Gain 20 dB Can be increased by adding a resistor
    DC offset

    ≤ ±0.3 mV

    ≤ ±2.0 mV

    Typical

    Guaranteed by design

    Finished Assembly Dimensions and Weight

    91.2 × 69.7 × 27.5 mm

    90 g

    (W × D × H)

     

    Recommended power supply Power-86 with 2x22 VAC, 160-300 VA power transformer
    All parameters are measured at a supply voltage of ±30 V DC.
  • The block diagram for the Modulus-86 is shown below.

    The Modulus-86 uses one channel of an LM4562 precision audio opamp and an LM3886 power amplifier IC to form a balanced, composite power amplifier. In this configuration the LM4562 is used both to provide error correction for the LM3886 and to provide a balanced input for the composite amp. Another LM4562 completes the front-end of the amplifier.

    The Modulus-86 is power supply agnostic by design. This feature is unique to the Neurochrome Modulus amplifiers. Due to the error correction provided by the Neurochrome composite amplifier topology, the Modulus-86 performs as well on a traditional unregulated linear power supply or a switch mode power supply (SMPS) as it does on a well-regulated laboratory power supply.

    The composite circuit topology also ensures a low DC offset for the Modulus-86. A typical build has less than ±0.3 mV of DC offset. Worst case the DC offset may reach ±2.0 mV. Note that to achieve DC offsets this low, the PCB must be cleaned of flux and other residues after soldering.

    The PCB layout is crucial at the performance levels attained by the Modulus-86. The four-layer PCB employs differential signal routing and carefully designed copper pours and planes to ensure optimal board performance. 

    The Modulus-86 has a gain of +20 dB (10×), which is the lowest gain supported by this circuit. This value was chosen to ensure a good gain structure in the end application. Should a higher gain be needed, it can easily be modified for higher values by adding a resistor. The gain can be increased (within reason) without impacting any of the other performance parameters of the amp.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 80056442933

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Elizabeth Delgado
San Leandro, US
★★★★★ 3
Great Entertainment, Short Battery Life
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This is the first interactive ball I've found that my dog hasn't managed to destroy, which is impressive on its own. The ball keeps him entertained for long periods, and he loves chasing, nudging, and following it around the house. The material feels durable and has held up well to regular play. The one button operation is convenient, and the ball is easy to recharge and clean. My biggest complaint is the battery life. On a full charge, it only seems to run for about 10 minutes before needing to be recharged again. Because of that, I find myself charging it frequently. Even with the shorter runtime, it's been one of the more engaging and durable interactive toys we've tried. Overall, a fun and sturdy toy that keeps dogs occupied, but be prepared for frequent charging.
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Reviewed in the United States on June 5, 2026
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Amazon Customer
Birmingham, US
★★★★★ 5
Fun Dog Toy
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This toy has been a lot of fun for our dogs. One of my dogs absolutely loves balls and is perfectly content to just carry this around in his mouth. The outer shell feels like a firm foam material. It is durable while still being lightweight enough for the dogs to enjoy. The ball screws together, but it is designed well enough that you are not constantly worried about it coming apart. You have to intentionally press and twist it to open it, so normal dog play has not caused any issues. Inside is the motorized component, which is easy to turn on and recharge. It offers a few different vibration modes, which keeps things interesting. The reactions from our dogs have been hilarious. One dog is convinced the ball might be plotting against him and keeps a suspicious distance. Another dog loves it so much that he holds it in his mouth while it vibrates, making his entire head shake. Our third dog plays with it exactly as intended, chasing it around and interacting with it normally. The motor has enough power to make the ball bounce, roll, and move unpredictably across the floor, which keeps the dogs engaged. It has been a great addition to our toy collection and provides a different kind of enrichment than a standard ball. Overall, the dogs really enjoy it.
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Reviewed in the United States on May 29, 2026
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Shannon
Fort Morgan, US
★★★★★ 4
A fun toy
Color: Classic Blue
Our Malamute loves this ball. He likes to carry it around with him and let it will out of his grasp and pick it back up. The outer ball it tough and durable, and so far it has held up well during play. It does bounces more than rolls I expected a little more movement across the floor in a more rolling fashion... like those weasel balls from the 90s, but tends to hop and bounce in place. It does works best on hard floor where it has enough contact to move around and keep the dog engaged. To charge you have to unscrew the ball in half to access the motor unit, and there is grease on the motor, so be careful when opening it and handling the internal piece. It is not difficult, but it is a little more complicated than a simple plug-in charging port. The button on is also super hard to press. I you have to really squeeze it and even use a tool to turn it on. It has 2 modes though it is so hard to press I am not sure which mode I actually turn on. It so far has been a fun toy for our young dog and has lasted our extreme chewer (only supervised play) I would recommend if it went on sale.
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Reviewed in the United States on June 1, 2026
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Ben G
Carnegie, US
★★★★★ 5
Works well on hardwood, and my dog is just a coward
Color: Classic Blue
This ball works really well on hardwood floors, rolling and moving around just like it's supposed to, though it struggles on carpet where the resistance seems to bog it down. I expected my dog to be thrilled by it, but instead he was afraid of the thing. In fairness, he's a big scaredy-cat by nature, so that says more about him than the toy. The ball itself feels very tough and well made. If he would actually work up the courage to chew on it, I suspect it would hold up extremely well, and I don't think he'd be able to pop it open on his own either. So it's a solid, durable toy that's earned my confidence, even if it hasn't yet earned my dog's.
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Reviewed in the United States on June 4, 2026
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Rocky Mountain High
Chelsea, US
★★★★★ 5
Keeps puppy busy .. and busy .. and busy
Color: Classic Blue, Color: Classic Blue
My young Shih Tzu is all about "magic" balls. He seems to know what is in the box before it is even opened. The product page says this ball is not meant for small dogs. Well, my Shih Tzu puppy can't read. He is positively obsessed with HIS newest "smart" toy. Thankfully, this ball came with a partial charge so Bodhi could begin playing immediately. This toy is an improvement over Bodhi's previous chargeable balls with unpredictable movements. I really like that the power button is on the outside since it makes it easier than taking the halves apart every time. The toy functions on every surface (so far) and it is reasonably quiet. This item is also waterproof so it can be rinsed off easily after use. Fantastic interactive toy.
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Reviewed in the United States on May 29, 2026

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