> - Do you want the RMS value of a typical sinewave, as someone
> else pointed out thats what you get from a typical el-cheapo
> multimeter. That would be easiest. Or do you actually need True
> RMS to give more correct readings for waveforms that are non-
> symteric, have DC offsets, high harmonc content, non-sinusoidal
> shpe etc.
The readings are not pure sine waves, they may be safely assumed to vary
anywhere from a pure sine wave to a voice waveform...and there will be a
deliberate DC offset of 2.5v that the signal will be centered around.
Otherwise my lack of experience tells me I don't really know what it is I
need...but I guess accuracy is best.

> - What is the voltage range input to your A/D converter
0 to 5v centered at the 2.5 offset

> - What is the typical frequency range of the AC voltage to be
> measured
I'll have a band pass filter that is fixed very narrow around 330Hz and
should attenuate a 5v peak input signal by 20dB at some range maybe 50Hz on
either side of 330.  The lab test on the filter was already done and results
were successful with that design.

> - How many bits resolution is your A/D
I'm using 8 of the 10 available (just because it's easiest to think of  a
byte instead of a byte and part of another byte)

> - Are there any time factors to be considered, eg speed of display
> update or A/D sample rate.
There's no visual output during all the calculations, just a latched single
LED on the port, one of 8 LEDs will be on based on the reading and will
latch until a new reading is done (however long it should take) and
overwrites the port.