Timeline for When measuring AC via an ADC, is it bad to have common ground?
Current License: CC BY-SA 3.0
4 events
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| Nov 28, 2011 at 2:57 | comment | added | The Photon | I should add, the LT1797 is probably not the ideal opamp there...it's input current is actually enough to change the time constant of the R4-C2 filter...a FET-input part would be better...this is just what I threw together quickly. | |
| Nov 28, 2011 at 2:49 | comment | added | The Photon | The opamp at U2 is a voltage follower. It's there so that the load on vout won't change the behavior of the circuit. Without that buffer, any load less than about 10 MegOhms would change the behavior. | |
| Nov 28, 2011 at 1:14 | comment | added | Dustin | I don't understand the purpose of the opamp on the right. I just tried this in a circuit simuilator and didn't see much of a difference from the + input of the second opamp and its output. | |
| Nov 27, 2011 at 18:30 | history | answered | The Photon | CC BY-SA 3.0 |