In The Testing Of Life Cycle Of Electrical Load Using Down Counter.  Following headings will be discuss here:

1. Block diagram
2. Circuit diagram
3. Working of system
4. Hardware requirements
5. Software requirements
6. Advantages
7. Further improvements

System working

This system consists of following working parts

1. Power supply for system
2. User input
3. Central Processing Unit (CPU)
4. LCD Display
5. Switches
6. Electrical load

Power supply of this system is done using a step down transformer (12-0-12, 500mA rated). This transformer converts 220Vac to 12Vac. Then 12Vac is converted to 12Vdc by using bridge rectifier. This 12Vdc is again step down and fixed to 5V dc by using voltage regulator ic (LM7805). This 5Vdc is feed to microcontroller (ATmega8). Working of microcontroller here is that it read user instruction from user inputs and it processes it according to program that burned into it and outputs its activities to LCD display. Switches is used to start and stop electrical load according to the instructions and number of switching cycle is recorded.