Hi, sorry for my english, i am Angolan citizen living in Africa continent, i love math, i can make some calculus, i work in electronic field for 15 years ago, i have the second year of high school in my country in electromechanical engineering, my oficial language is portuguese, i am sorry for my english, my matter is that i would like to create myself project from the begin till the end, start with the need example if i want to make a mosquito killer, i must know the frequency range that mosquitoes doesn´t like an make the project, i need you teach where i have to start.