This circuit uses half of the TI dual OPA2626 (not showing the other half of the OP AMP). This dual OP AMP supposed to use 2mA, but it's pulling around 6.8mA (measured at the Grnd pin and also at the Vcc pin). The other half of the OP AMP is currently not used and none of those pins are connected to anything. Should they be pulled up or down in case that's where the current leak is?
The V-out is going to an Arduino digital pin and draws about 8.8uA, but even when I disconnect it the entire circuit is at 6.8mA. The current from the voltage divider (P1 potentiometer) to the OP AMP draws about 2.4uA and to N2 inductance (20 Ohm) is 0.1uA. Disregard the other (N1) inductance, it does not use any power from this circuit.
The other question: do you see any obvious problems as far as wasted power or noise sources, better solutions? This circuit supposed to amplify a 2-4mV to 4-8mV varying amplitude one-shot AC voltage sinus wave by 1000, and seems to work fine.