I have been scouring the web for a digital sinewave generator that will do 1-50Hz, either with a programmable divide down chain, or a linear pot.
Most of the successful designs now seem to use dedicated IC's or SCF's. I would prefer something with common CMOS parts and a two pole LP passive flter ... and without having to manually switch capacitors.
I can live with a bit of distortion, but was thinking it might be minimized by using a staircase approach. Perhaps this is inherently easier to smooth/filter. Or maybe generating a triangle wave would facilitate filtering in some way.
Can anyone offer a few suggestions as to the best design options for this project?
Much thanks,
Norman