SKU: 43313623113

Modulus-286

Sale price$179.55 Regular price$199.50
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Description

Modulus-286The Modulus 286 is a 125 W, Class AB, LM3886 based power amplifier with error correction provided by an LM4562 precision opamp. It delivers clear, precise, and fatigue free sound; and distortion below 1 ppm even at full power. This third revision of the Modulus 286 features improved performance, in part due to the further optimized PCB layout. Modulus 286 Rev. 3. 0 is slightly smaller than its predecessor, but shares the same mounting hole locations,

The Modulus-286 is a 125 W, Class-AB, LM3886-based power amplifier with error correction provided by an LM4562 precision opamp. It delivers clear, precise, and fatigue-free sound; and distortion below 1 ppm even at full power. This third revision of the Modulus-286 features improved performance, in part due to the further optimized PCB layout.

Modulus-286 Rev. 3.0 is slightly smaller than its predecessor, but shares the same mounting hole locations, allowing for a direct replacement.

The wiring harness necessary for connecting to the Modulus-286 is included.

Technical Documentation

  • Description
  • Key Specifications
  • Circuit Topology
  • Key Features

    • Fully assembled module made in Canada from parts sourced from authorized distributors in Canada and the USA.
    • 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.
    • On-board EMI/RFI input filter and ESD protection.
    • Four-layer PCB optimized for high signal integrity. All ground management is handled on the PCB.

    Build difficulty (1-5): 1 (easy).

    The build video below shows you how to build a Modulus-286 stereo amplifier. Please watch the video to gauge the skills needed.

  • The graph below shows the THD+N vs output power for the Modulus-286 Rev. 3.0 for 8 Ω and 4 Ω load. The sharp jumps in the graph are caused by range switching of the APx555 used for the measurement.

    The table below lists the key specifications for the Modulus-286 Rev. 3.0. For the full specifications, please see the data sheet on the Downloads tab.

    Parameter Value Notes
    Output Power 125 W 4 Ω, < 0.01 % THD+N
    Output Power 65 W 8 Ω, < 0.01 % THD+N
    THD

    ≤ -130 dBc

    (0.000032 %)

    50 W, 8 Ω, 1 kHz
    Multi-Tone IMD Residual ≤ -140 dB Ref.: 50 W AP 32-tone, 50 W, 8 Ω
    Total Integrated Noise and Residual Mains Hum 13.0 µV RMS 20 Hz - 20 kHz, A-weighted
    Gain 20 dB 26 dB selectable by jumper
    DC offset

    ≤ ±320 µV

    ≤ ±2 mV

    Typical

    Guaranteed by design

    Finished Assembly Dimensions and Weight

    101 × 60 × 40 mm

    100 g

    (W × D × H)

     

    Recommended power supply Power-86 with 2x25 VAC, 200-300 VA power transformer for stereo
    All parameters are measured at a supply voltage of ±36 V DC.
  • The block diagram of the Modulus-286 Rev. 3.0 is shown below.

    The Modulus-286 Rev. 3.0 uses an LM4562 to form a balanced composite amplifier with two LM3886 in parallel. An LM4562 is used for the differential input. 

    The differential input can be used both with differential signal sources (XLR) and with single-ended ones (RCA).

    The Modulus-286 is power supply agnostic by design. This is unique to the Neurochrome Modulus amplifiers. Due to the error correcting composite amplifier topology, the Modulus-286 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 PCB layout is crucial at the performance levels attained by the Modulus-286. The four-layer PCB employs differential signal routing and carefully designed copper pours and planes to ensure optimal circuit board performance. 

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: 43313623113

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4.6 ★★★★★
Based on 13 reviews
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PikaJoon
Whiting, US
★★★★★ 5
Haru LOVES this toy!
I recently purchased the Amazon Basics Hide and Seek Squeaky Dog Plush Toy, Rabbit and Carrot 5 Pack, and it has been an absolute hit with my dog Haru! This set has quickly become his favorite playtime activity, and it's easy to see why. From the moment I introduced Haru to the plush toys, he was hooked! The rabbit and carrot design is not only adorable but also adds an element of excitement and curiosity for him. The toys' quality is impressive, with sturdy stitching that has held up well to Haru's enthusiastic play style. The "hide and seek" aspect of the toys is brilliant. Each plush toy contains squeakers, which immediately captured Haru's attention. He thoroughly enjoys searching for the source of the squeaky sound and then triumphantly "catching" the rabbit or carrot. It's like a mini-game that keeps him mentally stimulated and entertained. One of the best things about this 5-pack set is the variety it offers. Haru never gets bored because he can alternate between the different plush toys, and each one presents a new challenge for him. Whether he's "hunting" the rabbit or "nibbling" on the carrot, his excitement is contagious! Furthermore, I appreciate how these toys keep Haru engaged for a good amount of time. As a busy dog owner, it's essential to have toys that can entertain him while I'm occupied with other tasks. The Hide and Seek Squeaky Dog Plush Toy accomplishes this perfectly, giving me some peace of mind knowing Haru is happily occupied.
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Reviewed in the United States on July 21, 2023
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Verified Purchase
Jillian
Houston, US
★★★★★ 5
Great toy
Great size for a medium to large dog and a good value overall. The carrot foliage is made of felt and can tear easily, but the carrot body and bunnies have typical toy durability. The bunnies include squeakers that are softer and not high-pitched. The holes are sized well—small enough that the bunnies don’t fall out on their own. Even with only a few stuffed inside, they stay put until your dog pulls them out.
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Reviewed in the United States on November 30, 2025
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Verified Purchase
W. Willard
Charlottesville, US
★★★★★ 5
I was shocked by how much my daughter's puppy enjoyed this toy!
I've bought two of these — one for my grand puppy to use when she's at my house, and another for her to keep at her house. I was shocked that she actually seems to enjoy playing with this toy! She hunts out all the bunnies and then brings the carrot to me to refill. I refill it, and then she takes the refilled carrot back to her spot and hunts them all out again. If I can't find one of the bunnies (because it's gotten stuck in the couch cushion, for example), I ask her "where's the bunny?" and she helps me find it! This dog is a ferocious chewer but she doesn't chew these toys! It's like she instinctively knows they are for hunting, not chewing. As a result, they have lasted a long time and provide hours of quality fun. Great value!
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Reviewed in the United States on April 7, 2026
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WhiteheadsArt
Louisville, US
★★★★★ 5
My Iggies LOVE this toy. Buy it!!!!!
As a new dog mom to Italian greyhounds, I wasn’t sure if they’d like this, but it is their favorite toy!!!! They LOVE playing with the rabbits, chewing on them, squishing them, flinging them and chasing them. My one iggy likes to chew on the carrot and stick her nose in it when it’s empty. I find the rabbits around the house. So cute and seems to be well made. Definitely worth the cost.
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Reviewed in the United States on March 18, 2026
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Amazon Customer
Birmingham, US
★★★★★ 5
Very cute and well loved dog toy.
I have two maltese rescue dogs. One if still a puppy and the other is almost 5 years old. The youngest one is a chewer and goes through toys removing whatever she can as soon as she can. This is a VERY cute toy and comes with the 4 cute bunnies inside. My older dog loves to take the bunnies and cuddle them in her bed. So far the chewer has not been able to take them apart and for that I am very pleased. Very well made, stiched well. I was reluctant at first to purchase because of price, but I believe this is good value for your money.
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Reviewed in the United States on February 1, 2026

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