3.1 Electronic 7 3.1.1 Power Supply 7 3.1.1.1 Step Down Transformers 7 3.1.1.2 Bridge Rectifier 10 3.1.1.3 Filter 13 3.1.1.4 IC Regulator (LM7805) 16 3.1.2 Micro-Chip AD7755 19 3.1.3 Micro-Chip PIC16f877a 22 3.1.3.1 Introduction 22 3 3.1.3.2 Micro controller use in the project PIC16f877A 23 3.1.4 Liquid Clear Display (LCD) 25 3.1.5 Keypad 3x4 26 3.1.5.1 MM74C922 27 3.1.6 Relay 28 3.1.6.1 ULN2003 30 3.1.7 Buzzer 31

all in final report