Just found this patent file from freepatentsonlin.com , I believe my old DAC is the same unit which was made more than 10 years ago.
Could somebody advice how to improve or even upgrade this old unit ?
http://www.freepatentsonline.com/patents/us/524/5243344/5243344.pdf
Could somebody advice how to improve or even upgrade this old unit ?
http://www.freepatentsonline.com/patents/us/524/5243344/5243344.pdf