Designed using the 556 dual timer IC. One timer is used as an Astable multivibrator to develop Clock pulses. The other is used as a Pulse Width Modulator to control the time power is applied to the motor. Power darlington provides output drive up to 5A @ 100V DC max. Single 9-15V DC supply or separate supply for motor requiring greater than 15V. K-67 L: 3-7/8" W: 2-1/4" H: 2-1/2" WT: .3 Data Sheet