This must be a basic question, which I am struggling to find and understand suitable circuits to be able to read AC current using a micro-controller.
Most of the other examples are calculating DC current, while related questions such as this one, attempt to measure AC current on mains voltage which is not what I am after.
So far I have managed to calculate and measure the RMS voltage from a +-1.5 V sine wave. I am now looking to measure the current by simply using a shunt resistor in series with a larger load resistor (10 K ohm), and an op-amp, without any specifically designed IC's. Vref for my ADC is 3.3 V.
DO the circuits that measure DC current, such as the one below, still apply for AC voltage? I cannot seem to understand this basic concept.
EDIT: Can my AC source replace the above DC supply and still get correct readings, or do I need to make changes to the circuit?
Also if the circuit above was applicable for an AC voltage source, I am thinking need to get the RMS reading at
Vs. Is this correct?