First of all sorry for my English it is not as goos as I would like it to be
I need to know the power consumption of several points (14) and I have studied the design of the hardware to optimize it. I have a heatpump board working in Zaragoza (Spain)
My first question is: why do you use a reference voltage for each CT instead of use the same (1,65 V) for all of them (CT1, CT2 and CT3)? I think this has multiple advantages for the hardware but also for the software
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I cannot see an operational amplifier there to give a low impedance voltage source for the mid-point bias supply (ref_medida). I think you might have a problem with the signal on one channel also appearing at a low amplitude on the others.
Yes, that’s my concern and that’s why I’m testing the previous circuit but, in the tests I’m doing, the input signal from a CT has no influence on the others.
An operational circuit would be safer but if there really is no difference it does not make sense.