Hello,

I want to generate "clean" sinus wave that will be decoded by a modem. At this time, I have generate a square wave with a PIC16f84a but I've got some problem with the filtration that cause some delay to the signal when I changing the frequency (FSK system).

I want to try another way to generate my sine wave that do not need many filtration.

Someone told me about using 4 pins on the pic with voltage resistor divider to generate 16 voltages levels thats could be a good sine wave when all pins are well synchronized ? Someone have already try this with a PIC and can says me more.

thanks