This project is based on the popular PIC16f84A micro-controller.The heart of this project LED chaser is the PIC16F84A PIC microcontroller.A 4MHz crystal and capacitors C1 and C2 22pf is used for providing clock pulses to the micro-controller. The input voltage can be anywhere from 9 to 12 volts but the PIC microcontroller requires a precisely 5 volt supply.This 5V is provided from 5 volt regulator 78M05. Diode D1 1N4001 protects the circuit from accidental reverse polarity of the input voltage. Please note that the 16F84 without the A suffix are not suitable for this project. You must use the 16F84A parts.