i was just using BPW34s :) i have a batch of different photodiodes that i was planning on swapping and comparing but i can't even make these work reliably...
currently limited by my 20MHz scope (and free time...), but i saw the expected pulses after they were drawn out long enough by the amplification circuit to validate it was working on my desk (https://physicsopenlab.org/2020/06/15/cern-diy-particle-dete...), but i think my issue is shielding the diodes without introducing noise?
> this guy has to actually shave away some part of the diode to make it work? https://hackaday.io/project/204159-geigerwatch-a-sensitiv-ra...
Thats because he also wants to measure alpha and beta particles directly, if you are satisfied with high energy photons you wouldn't need to do that