I'm a mechanical engineer, who has the luck to design an easy transimpedance amplifier circuit to convert the current of a photodiode to a voltage between 0 and 5V (without really knowing anything about it.) I used this [reference design from Texas Instruments and did the calculations.](https://www.ti.com/lit/an/sboa220a/sboa220a.pdf) After some weired results with the voltage divider in place, I changed the design to the one you can see in the next picture. (The values of the components are different in my design.) [![enter image description here][1]][1] I ended up with some "useful" measurements, which showed more or less the same signal pattern compared to a professionally built transimpedance amplifier. See picture below. Blue line is my DIY-version, orange line is the bought amplifier. As you can see, there is a lot of noise in my design. I'm not really deep into electronics so I don't know how to improve the performance. Can somebody give me some advice how I can reduce the noise? FYI: I used [this opamp.](https://www.ti.com/lit/ds/symlink/opa380.pdf) [![enter image description here][2]][2] EDIT: I added the pitures of my PCB + the values of the components. When I read through the comments I realized that there is more to consider than I expected. I dont need a super low noise transimpedance amplifier, but lower noise would be great. Are there any easy fixes which I can use without additonal curcitry? [![enter image description here][3]][3] [![enter image description here][4]][4] [1]: https://i.sstatic.net/FSnCh.png [2]: https://i.sstatic.net/9IPVv.png [3]: https://i.sstatic.net/wRhFT.jpg [4]: https://i.sstatic.net/7dYS6.jpg