15 13 12 1 3 6 8 7 9 2 45 11 14 Vcc U2 Direction Vcc SW2 49 U1 Vcc 3 U1 555 Timer U2 UCN 5804 48 1 7 6 2 SW1 Speed Fast/Slow 100 K .47 F .02 F Stepper motor 47K Vcc= 12 VDC Vcc 47K 4.8B Team LRN