Photodiode Amplifiers (Transimpedance)


Today I’ve been playing with Photodiodes and transimpedance amplifiers. The video below describes the circuit I’ve been playing with:

It’s a very straight forward TIA circuit using an LM741. The 741 is almost certainly not a good opamp for this application, but it seems to work reasonably well here. I also laid out 9 photodiodes on a board using a similar circuit. When I come to build them up I may not use the 741, but another opamp with a similar pinout (possibly FET input). The basic TIA circuit and the build is shown below.

photo 1(1)

photo 2(2)

Kicad files/Gerbers: photodiode.tar