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Newbie: Regarding the circuit

(potsawat panya) #1

as the circuit in https://learn.openenergymonitor.org/electricity-monitoring/ctac/how-to-build-an-arduino-energy-monitor?redirected=true

I would like to know what we use capacitor in this circuit for? I’m really new to this so i would like to know the anwser to this question. Thank you very much.

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(Robert Wall) #2

It is there to “ground” the a.c. signal at the “midpoint” - see the circuit diagram: Learn→Electricity Monitoring→CT Sensors→3. Interfacing with an Arduino→CT Sensors - Interfacing with an Arduino
and especially this:
Learn→Electricity Monitoring→CT Sensors→3. Interfacing with an Arduino→Adding a DC Bias

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