The circuit which I am simulating here is a Strain Gauge Bend sensor module Y3 which I bought and is working well.
Now I want to integrate it within my circuit and it was better to add it in the design phase into my circuit instead of attaching it as an external module because I have a lot more modules to attach also. The circuit diagram which I got online for the device is below:
Now I want to simulate this in LTspice and I followed the procedure to install 3rd-party libraries for the LM358 op-amp using the PSpice libraries which I got online. The simulation for the TL431 however was successful; it was the op-amp which was the problem.
The library for the LM358 PSpice is from this TI website.
My schematic is as follows and in this version I replaced the op-amp with an AD820 because online forums showed that this might be a better approximation to the original one:
This simulation works well and does yield a somewhat similar result to what I expected but I can't add an input voltage of more than 3 V and the simulation does not show any output.
So the first thing I don't understand is why is this happening.
Next, when I simulate by replacing the AD820 with the LM358 3rd-party version, I get a time step too small error:
The above schematic is just a simple one where I use a UniversalOpAmp2.asy and change the directory to the new library which I got online and whose working is shown above.
Upon performing the simulation the error which I get is as shown:
I tried following a lot of videos online and other forums but the problem remains the same. I tried creating a symbol for this instead of using the UniversalOpAmp2 and changing directory, but the error remains the same and it would be very good if someone could help me solve this issue with a possible explanation on what was the mistake from my side so that I can learn.