Hi Stewart,

 another interesting suggestion to add to the "bag of tricks" for this
project ! Thanks.

73  Alberto  I2PHD
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Stewart Nelson wrote:

Hi Alberto,

The filtering requirements are less onerous if the
dithering frequency components are maximized, e.g. by
a DDA algorithm.  In Johan's example, add 442 to a
variable each main PWM cycle.  If the result is less
than 1024, send 705 to the PWM.  Otherwise, send 706
and subtract 1024 from the variable.  This results
in a sequence of 705, 705, 706, 705, 706, 705, etc.