i have already build a Geiger counter out of an Arduino Uno, a Geiger counter shield and many other parts (GPS, SDCard an so on), but i have problems with the voltage of the counter shield, so i want to build this part from scratch.
The layout of http://mightyohm.com/blog/products/geiger-counter/
is by far the simplest and best i found and i would like to recreate the high voltage and detection parts.
i have 2 questions:
1.: Unfortunately the FJN3303F is impossible to buy in Germany, and even the suggested replacement type (http://mightyohm.com/forum/viewtopic.php?f=15&t=501
) i cannot find. Does anyone know another replacement type?
2.: The Arduino Uno runs on 5v, so i don't have another voltage at hand, is it possible to run this circuit on 5v?
thanks in advance for your help, if i am able to adapt this circuit i will definitely credit MightyOhm on my Blog with a Link.