Quote Originally Posted by Charlie View Post
I can think of many ways to create a waveform that looks like that. However, a lot more detail of what you are doing is required to help you.
Charlie, I am trying to build a alarm using a piezo, the idea is to make it as loud as possible with 5v supply and minimum possible number of components. I will have a PIC in the circuit as well, so if it helps I can use it to facilitate something in this circuit.