Building a Photodiode Amplifier with Variable Gain

Here I use a BPW34 photodiode in a simple circuit with an LM358 opamp to show how one can exchange one of the feedback resistors with a potentiometer and have variable gain.

[@mariabanach9671]

Thank you so much. I've spent forever searching for a video to explain this and yours is the first to make sense! I am forever indebted to you. I will never be able to express my gratitude enough.

[@ShirishJadav162]

can we create a circuit with two sets of photodiodes and a nano power opamp that can detect a laser or focused light and generate a HIGH output to wake up controller?

[@35mmprojectorssachin77]

Photodiode amplifier used in film projectors

[@SoSo-pg8sn]

Good video. But the photocurrent direction is reversed. 😀