Timeline for Eddy-current input to op-amp misses reading at times
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Aug 2, 2022 at 16:33 | comment | added | Antonio51 | Be aware that the gain could be too high. | |
| Aug 1, 2022 at 18:05 | comment | added | TommyS | Added the updated circuit diagram in my original post. Will modify the actual circuit, test it, and will report back. | |
| Aug 1, 2022 at 14:45 | comment | added | Antonio51 | Right for your understanding. Voltage divider 10k/10k would be ok. Just don't forget a capacitor from the middle to the ground (>10uF would be ok). In fact, probably the input voltage is going below ground and becoming negative (not very "good" for some op-amp). | |
| Aug 1, 2022 at 14:36 | comment | added | TommyS | Thank you very much for the very well illustrated recommendation. I really appreciate the thoroughness. So based on what I understand from your post, fundamentally the current OP AMP circuit is suited for the expected frequency range, but I need to add a "DC point" at the + input (pin 3) of the OP AMP. Currently the DC level on + input of the OP AMP rests at zero which causes attenuation issues when voltage/current from the two sensors are applied. That DC point should be raised from zero to a constant 1.65V. Maybe I use a voltage divider from the VDD via 10K/10K resistors. | |
| Aug 1, 2022 at 8:35 | history | edited | Antonio51 | CC BY-SA 4.0 |
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| Aug 1, 2022 at 7:56 | history | edited | Antonio51 | CC BY-SA 4.0 |
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| Aug 1, 2022 at 7:36 | history | undeleted | Antonio51 | ||
| Aug 1, 2022 at 7:02 | history | edited | Antonio51 | CC BY-SA 4.0 |
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| Aug 1, 2022 at 6:57 | history | deleted | Antonio51 | via Vote | |
| Aug 1, 2022 at 6:49 | history | answered | Antonio51 | CC BY-SA 4.0 |