Timeline for Why do we use this capacitor in the opamp and why do we superimpose it on the DC voltage and then destroy it again with the capacitor?
Current License: CC BY-SA 4.0
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| Nov 6, 2023 at 10:22 | comment | added | bevren15 | For your 3rd answer, do you think the following is true? R13 limits the current here. This transformer reflects the current at the input. With resistance R1, we convert this current to the voltage we want. Therefore, what kind of problem can increasing R1 resistance create? For your 5th answer, this is a commercially available module. The transformer supports 1000V. If only the voltage of R13 limits this circuit, why don't they make R13 higher? In this way, they could sell it as a 1000V measurement instead of 250V with a small change. I wonder if there is another limit we cannot see? | |
| Nov 6, 2023 at 10:16 | comment | added | bevren15 | In question 1 you answered why we used C4, but what I really want to know is why did we use R3 and R2? If we didn't use them, there would be no 2.5V offset and there would be no problem. Why was this necessary? For your 2nd answer, I forgot to add that this circuit is already made to measure 50Hz 80-220V AC Main voltage. Is a low pass filter really necessary in this case? Or could it have another purpose? | |
| Nov 6, 2023 at 9:05 | history | edited | qrk | CC BY-SA 4.0 |
added 310 characters in body
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| Nov 6, 2023 at 8:52 | history | answered | qrk | CC BY-SA 4.0 |