Hello and welcome to the forum.

Microchip has an application note for sine wave with the 16F series chip. They show two ways to do it, one with PWM and the next with a resistor ladder. http://ww1.microchip.com/downloads/e...tes/00655a.pdf

The PIC18F2431 and PIC18F4431 have some great features for multi pwm sine waves. So recently most of the examples use this chip.

Here are a few examples: http://www.picbasic.co.uk/forum/cont...-DT-interrupts

http://www.picbasic.co.uk/forum/showthread.php?t=14359

You can also enter a search for sine and get some more.