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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4.6 ★★★★★
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Steven Turner
Belleville, US
★★★★★ 5
They are her favorites
Size: Medium (VALUE 2-Pack), Style: Beef, Size: Medium (VALUE 2-Pack), Style: Beef
We’ve had many dogs, many very destructive ones and wish I had these years ago. The hard toys get sharp edges, this toy is the best and yes is far better than the other red ones. My bulldog wants tug of war for 30 min to an hour every night. We’ve gotten tennis elbow, tendinitis, and pulled muscles holding onto this thing. She has tons of toys but 9pm and this is only option for her. We don’t get a choice. Easy to hold, well for a few min until your hand gets tired. First you one was about 3 years ago and she’s only on her third one. They last forever, easy to clean, and aren’t sharp edges. Seriously, better than any toy sold anywhere. My phone has hundred of pictures of Pickle holding this. She’s doing it right now. If you have a strong destructive dog that takes pride in destroying toys, ruin their confidence and get them this one.
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Reviewed in the United States on April 5, 2026
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Carnegie, US
★★★★★ 5
Perfect Toy for Large Dogs
Size: Medium, Style: Cheddar Cheese
I don’t normally leave reviews, but this toy is stellar and is a new favorite for my dog! She is a large dog (70lbs cattle dog lab mix) and I accidentally bought a medium, but it actually is a great size for her! So far this stands up to her chewing, but I may need to update in a few weeks to speak for durability but it really does feel solid. Most toys don’t last an afternoon once she starts chewing, so this has already won in that regard. The shape is perfect as well. She can gnaw at it, squeak, play fetch, play tug. It bounces when she throws it around herself. The fact it smells like stinky cheese is just an added bonus for her. All around, a very well designed dog toy!
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Reviewed in the United States on December 27, 2023
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Aly
Boise, US
★★★★★ 4
Boxer Baby’s Favorite
Size: Jumbo, Style: Beef
This toy is my sweet girl’s absolute favorite. It was the first thing we gave her when we brought her home, and she has been obsessed with it since. She brings it from room to room, inside and outside. I would highly recommend this toy, however, we have gone through six in one year. They’re not very durable, especially with our boxer mix, who is a very heavy chewer. I’ve gotten the red and the blue, and she will only take red, which is fine with me because the blue STINKS. The red stinks too, but less so. The squeak is very loud, but she genuinely loves it so much that it’s hard to be annoyed by it. I’d say give the toy a try, you may be unintentionally giving them their favorite thing ever lol.
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Reviewed in the United States on October 2, 2025
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Renia
Port Orchard, US
★★★★★ 1
Design Hazard
Size: Medium, Style: Bacon, Size: Medium, Style: Bacon
I have one of these in a larger version I picked up at the petstore. This one I do not recommend. There is a whole in the center where the pet bites down and my doggies' teeth kept getting stuck in it. If you've ever had a toy get stuck in your pups mouth, you've seen how thet go nuts trying to get it out.
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Reviewed in the United States on April 18, 2026
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Kate Morgan
Waukegan, US
★★★★★ 5
Cane Corso approved
Size: Jumbo, Style: Beef
I have two Cane Corsos, One is 80 pounds the other is 120 pounds. They can seriously destroy some toys very easily. These chewies have actually lasted for over six months at this point, which is pretty much miraculous. I bought them some more just so I always had plenty of them laying around as this discourages them from getting into trouble, chewing things they shouldn’t be chewing. They walk around with these and their mouths all the time and even after all these months, the squeakers still work. These are really high-quality and if you have a dog that just destroys toy toy, I highly recommend these. Even though they’ve had these for months, they go back to them to chew on and play with , it’s also really funny because they walk around with one and hanging out of their mouth and it looks like they’ve got a stogie hanging out of their mouth. If these toys can keep the interest and survive being mauled by these two giant Destructo mutts, then they must be really, really tough. I highly recommend these for super chewers. These even a hold up to having one dog, grab each end and then play tug-of-war with it. These guys can Easily go through A cow huff every day, but these toys are still going strong
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Reviewed in the United States on August 10, 2024

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