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This is a refresh of an old project I did and posted elsewhere quite sometime back.  I am publishing it again so that I can point to it for an upcoming project if needed. That project requires a square wave and thought I would see how well this works before borrowing a friend's function generator.  Since I only need a relatively low frequency square wave, it might also be possible to just use the microcontroller itself.  In any case, here is my AD9850 Frequency Generator BoosterPa ...