Arduino based digital to AC conversion schematic
It will help to explain what you want to drive with it because maybe it is not required the way you want it, maybe you don't need it. The 555-timer is also vague because you are using a MCU that can provide a pulse on interrupt, it could be possible your way of thinking isn't correct to achieve a solution. A (perfect) sinus output is impossible with such simple setup, it is on/off switching at a frequency, so it will output a harsh square wave when you also implement the negative side of the wave.

Anyway, take a look at this video, it will explain how inverters (I think that is what you want) work and what you need to implement it correctly:
https://www.youtube.com/watch?v=qVeERT4nyz8

However, because we still don't know what the exact purpose is of your idea, this is just a suggestion.