by weirdlab.fr:
I “rebuild” my Geiger counter, the SBM-20 tube was initially inside the box, i have put this one inside a 32mm diam plastic tube, for more convenience, wired through a XLR3 cable. This counter is from “Electronique-Pratique” n°368, a french electronic magazine. Shem, pcb, and PIC hex & C source code available.
Geiger counter with SBM20 tube – [Link]
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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)
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broken link http://www.f4huy.fr/?p=789
Check for this project here: https://www.electronics-lab.com/project/geiger-counter-with-sbm20-tube/
it works very well! works very well on LCD16x2 and PIC18F2550, without modifications