Hi again buddies, Thanks very much for your quick response. In fact ,you can't tell that the genertated frequency from L1 (radiator coil) will be the same as the generated frequency from IC2C & IC2D ,because they are converted into pulses at C5 & C6 then they go to the coil knowing that this coil has specific paramters that will change the bahviour of the generated electromagnetic field ,thus we may obtain difference frequency. However,i bought all the components except the radiator coil because i don't know it's value ,hence i have to make it myself. once i construct the circuit ,i will use the oscillscope and frequency analyzer to test this circuit. To be frank ,i'm doing this circuit for my graduation project at my univeristy and i can't stop now ,i'm involved :( any help will be highly appreciated guys ,please feel with me :( best regards "Somethings are true whether you believe in them or not " Yassir Zayyad Amman- Jordan PO BOX 230078 area code 11123