The schematic for the QCC-100 is shown below.  The quadrature input is received on JP1 and is fed to the PIC12F629 on GP2 and GP3.  The PIC counts the quadrature pulses as a 24 bit number.  It outputs this 24 bit number in Chinese scale format on GP0 and GP1 which are transmitted out on JP2.  The PIC is clocked via a 20MHz ceramic resonator Y1.  C1 and C2 are bypass capacitors for the PIC.  JP3 is for a header that allows easy access to the 5V and ground rails.

Click anywhere on the graphic to download a PDF version of the schematic.