SIGMA11 35V~80VDC 8A high voltage high power linear power supply board for amp

Name: SIGMA11 35V~80VDC 8A high voltage high power linear power supply board for amp
Brand: FYFAUDIO
SKU: 20260906-4
Price: 45 USD
Availability: InStock

SIGMA architecture with 35V~80VDC 8A high-power power supply, SIGMA11 high-power DC stabilized power supply.
Based on the SIGMA11 V3.0 architecture improvement, we communicated with the original author of AMB on the forum and came up with an improvement plan. The reference voltage adopts dual transistor stabilization, and the high-power output uses 2pcs TO-247 packaged high-power transistors IRFP240 in parallel, ensuring almost no voltage drop in high current scenarios. The optimal output and output voltage difference is 4V-10V, and it is important to pay attention to heat dissipation!!!

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Description

PCB Size: 77mm*77mm max height about 37mm
With power transistors Size: 98mm*77mm
Output voltage: 35V~80VDC adjustable
Max output current: about 8A

Input voltage: recommed higher than the output about 4-10VDC.

(for example: if you want 50VDC output. recommend input 54V-60VDC)

Note: this board not with Rectification and filtering circuit, you need connect extra Rectification and filtering power supply board

Those who have used the SIGMA power supply are aware of its design and noise control advantages, but the original version cannot support high voltage and high power output. After multiple experiments and discussions with AMB on improvement, an existing solution was obtained. The core circuit was replicated from the original SIGMA11, with small improvements to support high voltage and high current, and was approved by the original author. After multiple simulations and board verifications, the existing solution was obtained.

Attention: When install heat sink to the board, it is necessary to add an insulation gasket for the power tube (which will be included in the shipment) and apply heat dissipation silicone grease before installing the heat sink.

Linear power supply's Advantages for audio

Extremely low output ripple and noise
Linear voltage regulation suppresses residual AC ripple to a very small extent, with almost no switch spike noise. The power amplifier has clean power supply, better background black background, lower background noise, and less background noise and humming.

Better dynamic transient performance
Paired with a large capacity main filter capacitor, it has strong instantaneous high current supply capability. When there is high dynamic, explosive, and loud volume, the voltage drop is small.

Listening experience: Transient response is better, strong and weak contrast is distinct, and the impact force is more solid

Pure output voltage, low high-frequency phase distortion
Without switching frequency and harmonic interference, the high frequency is smoother and more delicate, reducing the stiff sense of digitization. The benefits are particularly significant for Class A and Class AB Class D amplifiers.

Low output internal resistance and good voltage stability

The voltage fluctuation is small when the load changes. The power amplifier music signal is a dynamically changing load, and a linear power supply can better stabilize the supply voltage and reduce power modulation distortion.

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SIGMA11 35V~80VDC 8A high voltage high power linear power supply board for amp

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