https://www.google.co.uk/search?q=simple+fm+transmitter&biw=1600&bih=775&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiOjtWdgcLOAhXmIcAKHW0EAx4Q_AUIBygC#imgrc=kiQJiKelqDqVMM%3A
I'm trying to understand this circuit and so far I read a lot about fm transmitter circuits, but there's no clear description...