Singxer F-1 external linear power supply

Hi friends
I have seen this old post
I wish to add usb to spdif to my dac
I was thinking to buy this card and install it inside my dac.
I have understand that use this card with linear power supply can upgrade it sound a lot so I have 2 questions.
1. I have seen this card sold in a lots of websites including aliexpress
Are they all genuine with genuine parts ?
2. Since I don't have the schematic yet
I have seen that when connecting the card to external linear power supply the DC--DC converter should be removed and the L1 inductor should be removed as well.
However in this card there is L2 inductor
What it used for ? Should it be removed as well ?

Best regards to all of you

Nehoray
 

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I use the JLSounds (http://jlsounds.com/i2soverusb.html) card. I'm pretty sure he builds with genuine parts. I believe it has spdif output; as I was planning to hook that up as well, but do check for yourself before purchasing. It also isolates the USB from the signal output side, with instructions on how to do that - no guessing, questioning. Uses good low jitter clocks too, so for a little more than this AliB card...