hi Ron,
It shows the complete system is battery powered, no apparent Vac/rect?.
Thats why I suspect something amiss with his Vregs.
I see he's put the polarity symbol the -V ok, [its the symbol thats wrong].
I wasn't referring to common mode noise, as you say, it should be unity, its the diff noise I'm concerned about, cant see how/if any screens connected.
Eng:
if you are reading the thread, I would recommend you look at the AD7705 dual 16bit ADC, its got a PGA 1 thru 128, differential input, single power rail, SPI style I/F, ratiometric ADC. [ use the 2nd ADC as temperature comp if needed]
What are you weighing.?
EricG