Hello. How can get maximum sensitivity out of a photodiode? So far the best result i got is by using a current-to-voltage amplifier: But with R at 1 MOhm it's still not good enough, and any more causes the thing to start oscillating out of control. Would adding another amplifier after that improve the situation, or would it just amplify some noise? If yes, what kind of amplifier should it be? Is there a way or point to remove whatever noise or oscillation this circuit gives with R>1MOhm, and keep adding resistors? Or, how to do it some other (proper?) way?