thx again,, but realy i must have some thoughts what this circuit look like( a general idea at least) , because you know i am almost done with college(this is my last semester), and all my studies will be only 4 years, so i guess i don't have enough confedance when it comes to real life stuff (beside studying and doning exams all year!),,, so please if you can guied me to the right way to design the circuit,,as my Dr realy does nothing but ask me for the last 3 monthes ( WHAT HAVE YOU DONE SO FAR!!!!!!!!).