Magnetic Tachometer for 755 775 Motors

This is a two channel (I,Q) magnetic tach for the popular 755 and 775 dc brushed motors. It is very low cost (less than $1), will operate at very high RPM, and provides accurately phased, glitchless I and Q outputs. The same design approach can be used to make an incremental panel mounted encoder for digital control. A more thorough pdf file is included in the files, along with the Solidworks source file.
Revisions:
11/12/2017 uploaded revised pdf, with minor spelling and wordsmithing cha