Zane83
New Member
audioguru said:Try your opamp again without the extra resistors. The output resistor is not needed since the opamp output is push-pull, and the high current in the resistor overloads the opamp and causes heating which changes its input offset voltage. Use a single opamp since the other one in the dual might be causing heating.
I'd removed the resistors and i'd increase the gain by increasing the R5 to 100k. This seems to give smoother output (it work like a half wave rectifier without increasing the R5).
Somehow, there is an overshoot at the very first waveform which is very important (only have to considerate the first wave as thats when the axle passed). I'm trying to make adjustment now. Hoping to get the result without overshoot.
-Zane-
![Without Extra Resistors.JPG Without Extra Resistors.JPG](https://www.electro-tech-online.com/data/attachments/9/9240-f5991d77679be09ba25042c5afaabc45.jpg)
![Without Extra Resistors - Waveform.JPG Without Extra Resistors - Waveform.JPG](https://www.electro-tech-online.com/data/attachments/9/9241-99e1259c2e859c440f30beeab4eb0299.jpg)