Hacker News Reader

> There seem to be builds using a through hole resistor for R3

That's the "electron-detector" version, which uses a 10M feedback resistor. The alpha-spectrometer version is the one that uses the 40M SMD resistor.

View on HN

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...

Reply on news.ycombinator.com