How universal is this remark? I use such a ‘filter’ in my 2SK182 after the Meanwell. It sound good.
With the Mark Johnson PO89ZB SMPS DC inline DC the SQ improved a lot same noise but tone more low so disturb less.
This info is related for comparison between a SMPS + Mark Johnson PO89ZB SMPS DC inline DC vs L-Adapter and in my audio system.
The noise seems like when you phone and it's busy this kind of noise is only playing music, without music hiss like white noise.
Both kind of noises it's only in right channel like with the SMPS.
When upsampling to DSD it's more strong so surely laptop polluting the sound.
Both kind of noises it's only in right channel like with the SMPS.
When upsampling to DSD it's more strong so surely laptop polluting the sound.
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Salas SMPS + filter 0 noise playing natives DSD files also 0 noise upsampling PCM files to DSD256 I guess both thanks to the DC filter installed between de noDac PSU & BiB, now two DC filters: one for the SMPS & the other PSU-BiB. So I'm sure the noise is L-Adapter related.
How's the grounding of your L-A done to its chassis and mains ground? Maybe needing another approach for your application.
Maybe the laptop prefers floating because its normally a battery operated device. When on SMPS recharging mode we don't know if the DC output is referred to mains either. In general try NTC thermistor for mains earth to chassis and/or the L-A's DC out zero should be tied to its chassis.
*Since your L-Adapter's DC output reads good and AC ripple reads zero or little on the DMM even when seriously loaded, there's nothing wrong with your build. Everything else is about system integration.
Hmm... some inrush current limiter disk around 33Ω 1.3Α. No bigger than 1.6A-2A 20Ω given what your 120W transformer can provide during at hard fault to earth.
In this case I thought gο hot less resistive at no more fault current than the range of SLB fuse for the specific transformer. ICL NTC datasheets have R25 spec (resistance at 25C) and Imax spec listed.
Without the NTC but mains earth connected togheter with r-core shield & 0Vout to chassis still the same noise