Are you sure OP is doing homework?

Seems like a reasonable assumption considering it's posted in the Homework forum.

 

Are you sure OP is doing homework?

They posted in the Homework Help forum, so that is the default assumption.

 

Its for my Senior Capstone Project. Yes its homework. I understand now. Thanks for the help.

 

I'm not sure how to shift the voltage waveform up without rectification.

I have an input of 0-70A, that through a CCVS will convert to 0-20mA. The 0-20mA outputs a 0-5V value (which is again stepped down to 0-3.3 V so as not to burn up the ADC. The ratio through the CCVS is 1/1000. Then the level shifting resistor arraignment converts from 5V to 3.3 Volts.

I'm trying to get a signal that is 0-3.3 Volts with very low current draw.

Hi,

I have a question for you.

What is it about the 70 amp input you need to measure?
Is it:
1. Current level (amps)
2. RMS current level (amps RMS)
3. Peak current level (amps peak)
4. Peak to peak current level (amps peak to peak)
5. Something else

This is important to know in order to determine how to implement this.
What i am wondering most about is if you need to sample the waveform several times within one cycle or is an average measurement good enough.