September 20, 2017

Geiger Counter

Here is a Hackaday project using a tiny SBM-10 tube. I have a big SBM-20 that I bought on Ebay (from Ukraine).

Mighty Ohm kit

This is a valuable site, with a lot of information about the SBM-20. He sells a kit, with a tube, for $100. Without the tube, you can get the kit for $40, which sounds like a great deal. Note that the SBM-20 tube sells for about $13 on Ebay. The FJN3303F transistor is a special part since it has to withstand 400 volts. It is currently readily available from Mouser for $0.46.

Other high voltage circuits

Turn your phone into a geiger counter

You buy a plug like thing for about $30 that you plug into the headphone jack on your android phone, load the proper software, and away you go! However, the reviews are terrible, so forget it!!
Have any comments? Questions? Drop me a line!

Tom's Electronics pages / tom@mmto.org