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I reply to myself, maybe it will be usefull for someone. Yes my xmos DAC works with separate usb supply 5V/GND from an external supply. I did test a supra usb cable too, and the result is better with the supra than with a home made Y cable (made with a good quality usb cable to the meter) with an external +5V supply. I don't know if it is impedance matching or something else but the supra with 5 days of use is far beyond all the usb cables i built : short silver one, twisted ones, braided others, with and without shielding, with only d+ d-, d+ d- and gnd on switch for handshake ... I would have won a lot of time and SQ having tested this cable before. B.

hi, Hi just change my audio gd DAC for a Smsl D1se. The first one only needed a ground handshake. The second gets a Xmxos that needs +5v supply from the player. So my DIY usb cable does not work anymore. Do you think a separate linear ultra low noise supply for xmos (and only data+/-from player) would work ? Other question : i don't know if it will be better to have the separate lps for xmoss and in this case a probably not 90 ohm bi - conductor wire on data side from player, or a common +5v and data from my player usb bus but with a 90 ohm usb cable from market. Thank you for your feedbacks Bernard

Sorry i did not see the question. Did someone test this delock ? I would be happy to have feedback from other listener. I did a lots of tests since one month on the supply with mine. I am building another lifepo4 supply for it. The result is magic but it is not trivial because the great noiseless sound is between 3v and 3,18v and all the linear regulators i tried (tps7a4700, lm317, lt1086) in floating charge gave at the end a not so good result than the lifepo4 alone. i use parrallel lowdropout diods after mylifepo4 to decrease the voltage and with 4 lifepo4 3,2v in parrallel i have hours of very stable voltage. Bernard

I rebuild a battery supply proto for the delock. It has very low noise when supplied at 3v <> 3,18 V. My new battery is : Lifepo4 6,4V >> TPS7A4700 ouptut 3,3V >> two germanium low drop out diods in parrallel to get a 3V output. With a 3,1V out TPS7A, i can heat it. With a 3,1V out TPS7A + lifepo4 in low charge (..3,1V), i can heat the TPS7A. With the 3,3V TPS7A + lifepo4 in high charge (3,3V) + germanium diods out 3,1V i don't hear the TPS7A anymore and the delock isolation is great. I am gonna package it now.

There is really something to build for those noise concerns on data input level : a player with low noise optical TCP/IP input, or a minimalist player with a dual memory load, mecanicaly discoupling the one that is loading once the other is playing on the same way uptone did it with their supercap supply. Manage the noise and isolation lower in the chain (usb and spdif) seams to me more hazardous and difficult because of real time / jitter concerns even if it gives the benefit on the paper not to take care to everything that is upstream.

Hi Alex, My suggest about removing the leds was stupid considering that lasers probably generates a huge noise compare to the Leds. For a voltage reference (dac chip) i agree that battery is not the solution, but with LDO you loose the very low output impedance and i think it has a big impact on the noise reduction. I did test different players (squeezebox, raspberry, Olimex) with lifepo4 batteries and with a LPS with a TPS7A4700 regulator (10uV), the battery did win each time and i don't think it was because of the 10uV or more LDO noise. A player or a MFC will not have big current load changes (as there are full digital there is not impulse response to manage) and if there are small current change they won't be significant due to the very low output impedance. But yes, batteries are a bit complex to manage for an all day use and there are security concerns too. What depress me at the end is that data transfert is noise by itself whatever will be the supply or upgrades ... The name of this forum could be : "Computer audiophile, manage the noise of digital audio"

They are several different ones and you have to check if it is compliant to your network (mono / multi mode and other options) but if caracteristics are ok it will be compliant. IME i use the MC110Cs on up stream side. After new tests yesterday evening : i don't know why but the level of noise on this MFC change, IME, depending on the input voltage. It become magic with an input voltage < 3,2 V (and it cuts at 3V), and this is a brutal change. Half / full duplex option on the upstream MFC change the level of noise too !! B.

Hi. I was first very happy with the MC100cs supply uprage and i confirm the benefit on image abd definition, but there is still a problem in high spectrum probably due to and hf noise source in the mc110cs. I thougth this would be resolved with hours of use but no. Delock has a strong effect on image (deft) and definition without the MC110cs high spectrum artefact. I definitely will keep it (in addition to my etalon isolator) I quickly built a 3,3v supply with two lifepo4 and a loader to test it and the sound is so good i don't stop to load it ... i am going to build a clean battery for 7 hours listening, replacing the 5v one i had built for MC110cs and that i don't use anymore (I don't use regulators). i confirm that the delock has no inner regulator att all. B.

I smoked my TP7A4700 regulator, so i did not test the MC110Cs LDO replacement (only switching regulator replacement). After several days of use without the switching regulator, i have to admit that there is still some high frequency noise with the MC110CS, and the sound change when i switch half / full duplex optical parameter. I think this HF noise is generated by the lasers and not the supply (and removing the green leds won't of course change anything). I did open my D-link DGS105 switch and a dexlan hub : they both have 350khz switching regulators. I found and test an other MFC that has no regulator at all (direct 3,3V input) : http://www.delock.de/produkte/G_86443/merkmale.html?setLanguage=en In half duplex mode, the SQ is much better than the tplink and all others network équipements i did test upstream my player. It is more expensive than the TP link MC110CS but it it compliant with it so i did only buy one for the downstream side. I did supply it for the test with a A123 lifepo4 cell that has a too short capacity for all day use. I will use it with a high capacity lifepo4 battery (+ regulator or drop out diods) of linear supply depending on the effect on sound. (The sound is horrible with the included wallwart switching 3,3V supply). B.

(-> I was talking about MFCs) Here is the MC110Cs switching supply bypass. depending on diods, voltage drop out can be 0,5V to 0,7V. Here with my 5V linear supply and 2 diods final voltage is 3,5V and the MFC works fine. He did not with 5V (no diods) and 2, 9 V (3 diods).

Hi I just did it. First, i took them away 6 monthes ago and replace them with an etalon isolator with a huge benefit, and i did add too a long ethernet distance between my switch and my etalon isolator (15m cat6 grounded only on switch side). 15 days ago i did change my internet box on my ethernet network and plug new equipments. I had to admit that even with the etalon isolator and the long ethernet wire, my new network config had downgrade image and timbres. It confirg to my the huge SQ impact of the noise coming from the network equipments (even with galvanic isolations). I was about to buy linear supply for my new internet box, fiber modem, NAS ... But before i did try to replug the MC110Cs btween my etalon filter and switch, on switch side. I did see a good improvement especialy on the image but there was still some network impact on trebles as is was 6 monthes ago when i removed the MFCs (due to the 348kz signal of the PWM component). Then, considering again the PCB, i found a FAST, CHEAP way to bypass the PWM schitching supply in the MFC : i did unsold the "+" leg of the female jack plug of the pcb, an link it with to basic 2X 1A diods in serial to the PV3V3 hole close to the green electro condo. Supplied by a standard 5V linear supply, the to diods downgrade the voltage to around 3,5 V just before the regulator, and the switching PWM component is short cutted. This is the best 1$ upgrade ever. All my network noise is now invisible from my player with the fiber bridge, and i bypass the switching power that is the main problem with the MFC. The image ans definition is incredible. I will post a photo this evening. B.

Thanks you. Same question. It can be not transparent for assynchronous clocking. It changes the sound, yes, but it does not affect the dac signature (it affects the source signature). It adds some noise too. Sent from my iPhone using Computer Audiophile

The jitter is invisible to the os too. The fact that the regen and the intona are invisible to the os does not mean they have no impact on asynchronous drive process. Sent from my iPhone using Computer Audiophile

Q Sent from my iPhone using Computer Audiophile