Simple Square Wave Amplification Technique?
If you don't mind burning up power, but want simple.  You need to size your resistors to match whatever you choose for C1 (so if C1 = 1uF, choose R = 100 ohms, which means that Q1 needs to be a power transistor, not a cheezy little 3904).







simulate this circuit &ndash; Schematic created using CircuitLab

If you want to be more efficient, but can stand more drop (the output will pull down to about 0.9V, and up to 50V - 0.7V).







simulate this circuit