I don't have K1 or Samsung note 2 but I used to have mojo and fiio e17k and still have Samsung s6 edge. The only issue is the sampling rate with mojo sometimes but work just fine with e17k.

Most sound card have line-in which it can receive analog signal and convert it to digital signal.
If you want dedicated hardware to do it, what I know is only those use by professional or musician such as Lavry AD11 or Apogee Element 24.
But why take analog signal, convert it to digital, then output back as analog?

Hi ahmadfaizadnan

Just to share what my latest update to my "I am too stingy to spend too much" rig 

DAC/AMP:
I got myself UD130 after looking around the market as it most reasonably price product but packed a punch.

It also worked with M7 DAP via OTG cable but it zap battery life out very fast 

Not to mention buatan Malaysia too and seller is 

Nope, I just use "Fiio CL06 Type C to Micro USB OTG " cable as UD130 does not have any line in.

It just plug and play and the UD130 will power out by itself. Surely it works but I did not try it on long run as M7 will also power UD130 as well. M7 battery life is only average in my opinion like 15-16 hours max with lowest brightness setting.

Yup, always goodcto try checking first just in case they ship to Malaysia.

Will take 3 to 6 weeks to arrive. Reached Malaysia yesterday, so hope can get by next week.

the hd650 is RM1299 now according to starspicker

Finish already the promo, it's 8-14th May.
Or you can try your luck ask them if still can get that price.

The HD6xx is the one they sell in Massdrop? Kena kastam tax or not when they send over?