Reduce the effect of C as well as the Parameterization

[z0d]

Hello fellow Electronites,

I'll just dive straight in. Here's a picture of a circuit I'm simulating.

1ST ENQUIRY : So the blue line has a bounce (caused by the internal capacity of the conductivity sensor which is represented here by R7 & C2 ) that I'd like to eliminate. Any ideas?

2ND ENQUIRY : I want my red output to have much BIGGER values - to be able to read the slightest changes. How do I parameterize my IN-AMP accordingly? maybe in the region ±1...±3V instead of in mV. I tried messing around with the resistor values but I didn't get far.

Thanks in advance for your suggestions and opinions and time.

Because time is not a constant. And neither are suggestions nor opinions.

 

[duke37]

Changing R13 and R14 to 100k will multiply the gain by 10.

Is your simulation of the detector correct?
Increasing the rise time of the signal will reduce the overshoot.

 

[z0d]

Changing R13 and R14 to 100k will multiply the gain by 10.

Is your simulation of the detector correct?
Increasing the rise time of the signal will reduce the overshoot.

yes it's just an equivalent circuit - I am assuming by detector, you were referring to the sensor. i actually did try increasing said resistors to 100k. but wasn't exactly what I wanted either.

But anyway I looked around and yeah too many OAs don't make the circuit better. So I replaced my very raw INA with a ready-made INA and it works better now. Just need some tweaks.

thanks for your suggestion!