I don’t think that makes much of a difference to the part selection (it’s the same board). If you look at the schematics they say you can use either through hol

I don’t think that makes much of a difference to the part selection (it’s the same board). If you look at the schematics they say you can use either through hole or SMD. SMD is preferred: https://github.com/ozel/DIY_particle_detector/blob/master/hardware/V1.2/documentation/DIY%20particle%20detector%20schematic%20v1-2.pdf https://github.com/ozel/DIY_particle_detector/blob/master/ha...