The opamp appears to be configured as a transimpediance amplifier. 40M is a lot of gain. Probably keeping traces short and the resistor away from the board helps. That’s probably why they mount the resistor vertically when they use a through hole in the pic above (my guess anyway). Using a SMD keeps the traces short, which might be why they use it in the current version.
Another option could be just to air wire the resistor. Sometimes people bend up the legs on the opamp and wire the resistor/input directly to the IC pin.
I think you might have issues on a breadboard. Air wiring the whole thing would probably work. Or using protoboard, trying to keep the traces short.
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/ha...
The opamp appears to be configured as a transimpediance amplifier. 40M is a lot of gain. Probably keeping traces short and the resistor away from the board helps. That’s probably why they mount the resistor vertically when they use a through hole in the pic above (my guess anyway). Using a SMD keeps the traces short, which might be why they use it in the current version.
Another option could be just to air wire the resistor. Sometimes people bend up the legs on the opamp and wire the resistor/input directly to the IC pin.
I think you might have issues on a breadboard. Air wiring the whole thing would probably work. Or using protoboard, trying to keep the traces short.