In what way does it do wonders for Mojo?Does it eliminate RF noise and improve sound?
Not sure about the technical stuff to be honest. It just makes it sound better. If you want technobabble, here is some from Schiit (no affiliation):
"Why would I need a USB to SPDIF converter?” you might ask. Well, maybe you don’t. Maybe you’re already using our Gen 5 USB input. But if you aren’t,
this is a great way to convert virtually any computer, tablet, streamer, or phone into a dedicated, high-performance audio source.
Works with Virtually Any Audio USB Source and DAC
Just connect your USB source to Eitr’s USB input, and connect Eitr’s coaxial SPDIF output to any DAC that accepts coaxial input. Now, you have
complete isolation from source to DAC, together with a superb, low-jitter coaxial SPDIF interface for bit depths and sample rates up to 24/192.
USB, Solved: Gen 5 Technology
The Eitr features the same unique Gen 5 USB input technology as in our upgradable DACs. It’s simply the highest-performance USB input available today, with
complete electrostatic and electromagnetic isolation (via transformers), self-power of all critical low-noise and rechecking sections, and separate, precision clock sources for both 44.1 and 48kHz multiples. (And if you don’t understand the technobabble, here’s the point: it works great and sounds great, too.)
Linear, Low-Noise Power Supply—Built In
You won't need any "linear supplies" or other "add-ons" to improve Eitr—like all of our stackable products, we've built in a linear supply with multiple stages of ultra-low-noise voltage regulators. From the included 1.5A, 6VAC wall-wart to the output, there are no switching supplies in Eitr."
http://www.schiit.com/products/eitr