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Diyaudio usb isolator11/12/2023 ![]() Without the cap, there is a good chance it radiates well, especially since it appears to be in a plastic enclosure. You will see a lot of devices that have isolated DC-DC converters like this with a cap across the isolation barrier to provide a return path for the common-mode noise that couples across the barrier. I wonder if this device has been EMC tested. The daughter board will convert DoP stream back into native DSD stream bit-perfect at real-time. Supports native DSD playback by plugging in an optional DSD decoder daughter board. I don't think this is conceptually too difficult to implement, however, validating that it works with all USB devices and controllers is probably not an easy thing. To isolate ground and all other signals between RPi/ODROID and audio system. I am surprised they use an FPGA on both sides to do this and not a USB interface that spits out ULPI. Technical Indicators: Compatible with USB2.0 ADUM4160 isolation voltage: 2500 v Power module: isolation voltage 1500 v Support USB 1.5 Mbps at low speed and full speed 12 Mbps and does not support pure high-speed equipment Support USB control transfer, bulk transfer, interrupt transmission, synchronous transmission/etc Power supply: from the. Exellent sounding Dac and amp modules cost an extra 150. Everything I play Music, Video, with players or streamed has room correction, Crossover, phase correction. I think you need some kind of internal state machine to be able to do it like the ADuM4160 and similar parts. Guys it's just another Option to extract good sound from a Computer. USB isn't just differential data, there are some bus states indicated by single-ended signals on some of the pins. Normal opto, GMR, or capacitive isolators are either not fast enough or don't meet all the requirements for USB. ![]() ![]() The Xilinx FPGAs here are essentially deserializing the USB data so it can be passed over multiple slower data pins which allow for the use of an isolator. Will try to fathom it's capabilities by removing the transformer and feeding the outgoing side by an external, clean, low noise +5V supply, once I have some time left for that. The osci plot shows that the middle tapped transformer bridging the isolation gap roughly outputs a 245kHz 4,5V rms square at each winding, what makes for a nice 5V DC after rectification at the following capacitor. On the pictures we can see that there is heavy horsepower packed on the boards, the isolation gap in the middle is bridged by two components for data transfer and a tiny transformer to power the outgoing side. Both USB SPDIF modules run 192KHz24bitstereo (1MBps) so they are probably both hispeed 480Mbit. The Adum4160 is a fullspeed isolator running at 12Mbps1.5MBps-protocol1.1MBps. Intona, DAC, USB 케이블 그리고 음질 - 와싸다닷컴Ĭomparing the 1kV version in the white box to the 2.5kV version (print), the latter clearly winns by my auditioning. The reason is the BUS speed - please note that USB 2.0 does not imply USB bus speed - read more USB2ISO support page. Here is an IMO interesting page, that also shows same measurement plots taken in different set ups, but you possibly have to use a translator to get the meaning of the plots. There is already written a lot about the Intona in audio terms. With the Intona, at the beginning not even intended as an audio gadged, I've got quite a substantial upgrade in SQ.Īs a surprise for me, it does that not by simply emphasising on one frequency department or another but by widening the perceived dynamic range. What usually can not be modified, is the impact of the USB connection between PC and DAC beyond swapping insane expensive cables or give all sorts of "purifiers" a try. That is the main thing I wanted to show in the schematic above, the 5Vs being filtered by a PI filter, and a distinct break between input and output over 3 barriers.There is a lot of things one can modify to improve upon sound quality of a given DAC design or set up. You cannot guarantee that the host device has good clean power especially if it is a PC as these are often built down to a cost, so treating this line as a possible source of noise is paramount. Again, think of your 5V USB supply from a PC, this is the most likely candidate to have noise present. Again this gives the best shielding and return paths for all the signals and further minimises noise problems as the capacitive coupling between the power and the ground is minimised. I would have the bottom layer for ground and ground planes only and would route the power on the top layer as tracks. The main coupling method for this high frequency noise is capacitive (this is one of the areas that many forget when laying out PCBs, capacitive coupling of high frequency noise) so having a clean plane under a noisy plane negates the split. Any noise from a computer or other source that the USB comes from is going to be mainly high frequency. Yes that is critical to noise suppression.
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