Found this. It may be of interest to some. Thought I would post it. May can use it with the EZ-B.
Quote from web site: "It uses an AS5040 magnetic rotary encoder to measure the absolute position of the rotor of whatever motor you're using. This is actually pretty exciting. Powerful servo motors are expensive, but with one of these, you can use whatever motor you can get your hands on. Big DC motors are cheap, but even used DC servo motors expensive. Best of all, the encoder is open source and you can score a kit version for a paltry $20. Now we can make that 8 horse power servo."