Low Ohm Meter3

I have designed Low ohm meter.

Some guys has demanded more features.

Last time added a LiOn battery, battery to 5V dc/dc converter,
battery charger and the voltage measurement.

This was not enough, they require that voltage must measure also AC voltage and negative voltage.
I thought that changing two wires to measure negative voltage is not very difficult, but AC voltage may be.

So I added two ranges of AC voltage.
0-5V ( actually divided by sqrt(2).
and 0-50V.

I thought thät is enough.

I added two AC/DC amplifiers and both has own ADC channel in CPU.

Here is full schematic diagram

Here is the PCB

What do think about this circuit?

Pekka