Converting dc to ac to inductivly power and object

[carbon dude oxide]

Hello,

I have a small project that i am thinking of doing at the moment however one of the main factors which will effect if i can do it or not is how to get a Sine wave (poth positive and negative voltages) from a +- dc supply (maby split supply with virtual ground)

How would i go about making a sinewave using a micro? I know i would have to use the pwm on it to drive some mosfets but how would i actualy inplement it?

[Simon]

you will need to keep changing your duty cycle value and then apply a suitable low pass filter on the output to extract the sine from the train of square pulses.

[tszaboo]

I'm not sure why you would ever need a microcontroller to do that. Just make an oscilaltor for the correct frequency. If you need high currents and stuff, connect it to this: http://www.ti.com/tool/TIPD108 and route the output to a mosfet with a driver. Why would you complicate your life that much?
I'm even sure that with one or two 555 you can generate a sine wave.

[carbon dude oxide]

I ran out of 555 timers a few days ago and i have a few atmegas running around at te moment so i was going to use them temporaraly untill i can get some more 555's

[carbon dude oxide]

Ok so am i going to need an n channel mosfet (while im using the atmega) so that i can drive the 12v rail and then a p chanel for the -12v rail?