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Circuit Description
The Modulus-86 Rev. 2.3 is a composite amplifier providing true world class performance. This performance level is reached by using a specialized audio op-amp to perform error correction on a high-power chip amplifier. This Neurochrome composite amplifier topology results in a high-performance 65 W amplifier with vanishingly low distortion and phenomenal sound quality.
The Modulus-86 is a turnkey analog subsystem. It requires no adjustments and it achieves state of the art performance using readily available off-the-shelf parts. The Modulus-86 uses one channel of an LME49720 precision audio op-amp to perform error control on an LM3886 power amplifier. An OPA2277 precision op-amp is used as a high-end DC servo with third order filtering for an ultra-low output DC offset and fast settling time. The DC offset is less than 200 µV and is reached within ten seconds of power-up. A THAT1200 differential receiver provides common-mode rejection rivaling that of a line transformer, thus, minimizing hum injection by eliminating ground loops in the signal path.
The Modulus-86 is power supply agnostic, which is a unique feature to the Modulus-86. 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.
Key features of the Modulus-86 Rev. 2.3:
70 W (4 Ω), 40 W (8 Ω) output power when using the Power-86 and recommended transformer.
Mono construction: One Modulus-86 board per channel.
On-board error correction circuit with local low-noise power supply regulators.
Ultra-low 0.000054 % (-125 dB) THD (1 W, 8 Ω, 1 kHz).
Ultra-low 0.000088 % (-121 dB) THD (40 W, 8 Ω, 1 kHz).
Ultra-low 0.00042 % (-108 dB) THD+N (40 W, 8 Ω, 1 kHz).
Differential input with nearly 90 dB CMRR eliminates hum and ground loop issues.
Differential/balanced/XLR input can be used with single-ended/unbalanced/RCA sources as well.
Power supply agnostic. The phenomenal power supply rejection ensuring consistent, high performance even with unregulated power supplies and switch mode supplies.
Ultra-low -120 dB inter-channel crosstalk in stereo builds greatly simplifies the power supply requirements.
Elaborate use of planes and copper pours to maximize circuit performance by minimizing supply and ground impedances.
Low-inductance signal ground connects to power ground at one point only for maximum performance.
On-board Zobel and Thiele networks for maximum stability even with capacitive loads.
On-board EMI/RFI input filter and ESD protection.
Power and output terminal blocks accept wire sizes up to AWG 10 (5.2 mm2).
All thru-hole construction with socketed ICs. Easy to solder. 90 × 70 mm board footprint.
Bill-of-materials includes a Mouser Electronics Project Link for ease of parts ordering.
https://www.neurochrome.com/modulus-86/
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