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How can I build a circuit that works like the AD629?

Question asked by INORAN on Feb 3, 2016
Latest reply on Feb 9, 2016 by Emman.A

I'm an electrical engineering student that wants to measure DC voltage from a solar panel that outputs a maximum of 40VDC. I came here from the EE Times article (Difference amplifier measures high AC voltage without heat | EE Times).

 

I have simulated in Multisim a circuit like the one presented in the FUNCTIONAL BLOCK DIAGRAM of the datasheet (http://www.analog.com/media/en/technical-documentation/data-sheets/AD629.pdf) using Multisim's 3T_Virtual Op-Amp model. It kind of behaves like it should (reduce voltage by 1/20) but I don't know how can I have the most important feature, that is to accurately measure large DC signals. I was thinking of using a 741 for the job, but I'd like to know which other amplifier can I use in order to accomplished what I have described.

 

PS: I'm asking this because I can't find the AD629 in my country and buying it overseas its too expensive for me, I want to know if it's possible for me to recreate its behavior.

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