Popular Post barrows Posted August 26, 2019 Popular Post Share Posted August 26, 2019 Your emergency backup battery supply is probably not anything like the supply for the Hugo 2. It is very likely that this supply uses very noisy switching regulators to provide the 5 VDC output on its USB port. It is likely that the output of this supply is both relatively high in impedance and noise. I would suggest trying a true audiophile quality linear power supply with the Qutest to achieve its best possible performance. My brother owns the Qutest, and I designed a very good linear supply for him, and he finds the Qutest, with this linear supply performs at a much higher level than with its stock power supply. atxkyle, Doak, motberg and 5 others 5 2 1 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
barrows Posted August 28, 2019 Share Posted August 28, 2019 17 hours ago, Sonis said: I took the power supply “brick” apart and there is no switching regulator for the 5v USB power. It seems to be a standard 5V IC regulator. Looking at the output with my 100 MHz Tektronix scope, It looks clean as a whistle. No noise. And the wall-wart is equally clean. Are you sure that the regulator is non-switching? I mean did you check the PN? I am assuming the Hugo 2 uses LiFePO4 batteries, the potential advantage of LiFePO4 batteries is that the have very, very low output impedance (at least when charged up). Only the best linear regulators will equal a good (yes there are good and bad ones) LiFePO4 battery in terms of output impedance. The supply I designed for my brother's Qutest utilized a super low output impedance and settling time, discrete, regulation circuit. He found much better sound with this supply over the supplied wall wart... I am not saying that you are wrong, but it does seem odd that your findings contradict the majority of other users... This: "And the wall-wart is equally clean" suggests that there is something wrong with the measurement. Even the very best SMPS (and these are much bigger than any wall wart) still have orders of magnitude higher noise than the best linear supplies. Check out the specifications for even the very best SMPS, they have at least hundreds of µVs of noise, usually a few mV. The best linear regulated supplies have noise levels in the 10s of µVs. Superdad 1 SO/ROON/HQPe: DSD 512-Sonore opticalModuleDeluxe-Signature Rendu optical with Well Tempered Clock--DIY DSC-2 DAC with SC Pure Clock--DIY Purifi Amplifier-Focus Audio FS888 speakers-JL E 112 sub-Nordost Tyr USB, DIY EventHorizon AC cables, Iconoclast XLR & speaker cables, Synergistic Purple Fuses, Spacetime system clarifiers. ISOAcoustics Oreas footers. SONORE computer audio | opticalRendu | ultraRendu | microRendu | Signature Rendu SE | Accessories | Software | Link to comment
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