Quantity   Component name
1 × PIC 18F14k22 (programmed with the source code) http://techref.massmind.org/techref/io/SERVO/BOBPID.htm
1 × BOB PID PCB (or breadboard, perfboard, your own design PCB, etc... http://techref.massmind.org/techref/microchip/bob.htm
2 × 10 pin 2x5 header Shrouded is best. 1 for Logic power, Ground, PWM, Direction, and Enable to Motor Driver, and 1 for Logic power, Ground, Step, Direction, Enable from Motion Controller (E.g. RAMPS, GRBL, etc...)
1 × 1x5 header For TTL - USB connector.
1 × 1x6 header To connect to the encoder Phase A, Phase B, Power, Ground.
1 × 220uF to 1000uF electrolytic capacitor Power stabilization
1 × 1000pF to 22000pF ceramic capacitor Power stabilization