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
