- Wed Mar 18, 2015 11:57 pm
#180520
Hi,
Please excuse my lack of understanding.
I have a current transformer here. Say it's rated at 100A and puts out 0.333v when at 100A. Assuming that's RMS, then that's 0.471v peak-to-peak. I need to boost this to get the maximum resolution of my Arduino Due, which has a max input of 3.3v.
I understand that I can use an opamp to achieve what I want. I think I need around 17dB gain.
The resulting AC ouptut from the opamp should be dc biased at 1.666v so that it can be sampled by the ADC.
Not sure what opamp would be best for this, I want a pretty linear output if possible. A quad package would be Ideal as I am measuring 4CTs.
Thanks for any help provided.
Please excuse my lack of understanding.
I have a current transformer here. Say it's rated at 100A and puts out 0.333v when at 100A. Assuming that's RMS, then that's 0.471v peak-to-peak. I need to boost this to get the maximum resolution of my Arduino Due, which has a max input of 3.3v.
I understand that I can use an opamp to achieve what I want. I think I need around 17dB gain.
The resulting AC ouptut from the opamp should be dc biased at 1.666v so that it can be sampled by the ADC.
Not sure what opamp would be best for this, I want a pretty linear output if possible. A quad package would be Ideal as I am measuring 4CTs.
Thanks for any help provided.