Another Discrete R2R Multibit Dac that can do DSD, again from the land of the Great Wall

Thanks for your informed response George, I appreciate it. My DAC takes the approach of a single resistor for I/V conversation. It is but only one of several suitable methods but it surely sounds very good as implemented.  I will read the thread you cite. 
Charles,

For multiple stacked implementation of R2R chip, do take a look at this website,  www.dddac.com . It allow you to stack as many R2R as you like and it comes in diy modules. Some basic knowledge of electrical and soldering skills needed though. However,  from the diy community, the results from this dac are overwhelming,  the more stack you use, as much as 16 (4 levels high)  the better the sound. The audio performance always improve by using more and more R2R chips! 
-phil 

For those here that have some digital  technical and diy ability and who know at least some Ohms/Kirchoff’s laws, you can put together your own discrete R2R Multibit dac with volume very cheaply designed by Soekris, for around a couple of hundred bucks.

https://hifiduino.wordpress.com/2015/03/16/soekris-dam-1021-r-2r-dac-users-guide/

http://soekris.eu/shop/dac_modules_diyline_dam1021_en/

Cheers George