Harmonics of a Square Wave.... 1. The problem statement, all variables and given/known data A 200kHz square wave with a fundamental frequency amplitude of 15V. Find amplitude of the third harmonic. 2. Relevant equations This is what I do not know. I know this is a fourier transform problem but just don't know what to do with it. 3. The attempt at a solution I just took 15V and substracted (1/3) from it to get 14.6667 Volts.