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The σ78 and σ79 ultra low noise voltage regulators
https://www.amb.org/audio/sigma78_sigma79/
σ78 is based on the Texas Instruments TPS7A4701RGW ultra low noise positive LDO voltage regulator, a 5mm x 5mm QFN-20 surface-mount device with power pad on its bottom side. The board also integrates the needed support parts (input …
Ultralow Noise Regulators - Analog Devices
https://www.analog.com/en/products/power-management/switching-regulators/ultralow-noise-regulators.html
Ultralow Noise Regulators Analog Devices offers a unique family of ultralow noise linear and switching regulators for applications that have severe noise requirements—for example, sensitive RF or audio circuits in a confined …
Simple Low Noise Voltage Regulator? | diyAudio
https://www.diyaudio.com/community/threads/simple-low-noise-voltage-regulator.199810/
Inject A-weighted noise into Vcc or Vee and measure the point at which it becomes "hearable" on a quiet recording. For a moving coil phono preamp this is going to be a pretty low number! Output impedance is tricky to measure below 10 milliOhms or so. Walt Jung, in a lab setup was able to measure it below 10 microOhms.
Extremely Low Noise Regulator - GitHub
https://github.com/AuteurAudio/electronics-extremely-low-noise-regulator
Extremely Low Noise Regulator. This details a regulator that is used by the Auteur Audio Lilienfeld's Choir amplifier. It was designed to have both extremely low noise and to be extremely precise. The reason is that the topology of Lilienfeld's Choir, being a non-feedback topology, does not have the power supply rejection witnessed in other topologies.
Discrete Voltage Regulators for Audio ... - Sparkos Labs, Inc.
https://sparkoslabs.com/discrete-voltage-regulators-audio-power-supply/
Our discrete voltage regulators have at least 15 times lower output noise than IC regulators. They have 52dB (about 300X) better rejection of any noise coming into them, and 4X better load regulation than any other 3 terminal IC regulator that one can find to compare them against.
Reducing noise in voltage regulators | diyAudio
https://www.diyaudio.com/community/threads/reducing-noise-in-voltage-regulators.1437/
The Sulzer reg is again imperfect - veroboard isn't very conducive to proper circuit layout. The noise of the Sulzer cicruit wil be lower if an op-amp with lower voltage noise is used, The TL071 is't very quiet at about 18nV/root Hz. Sulzer used an NE5534, which has a 4nV/root Hz volotage noise figure.
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