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Thanks for the reply! I was able to run the geiger counter from the 3.3v line on the arduino overnight without any problems!

First off, let me say that the kit is awesome and works very well! (speedy shipping too, even across borders) I have the Geiger counter hooked up to my arduino and am using it to generate random numbers. To generate large amounts of numbers, I need to leave the Geiger counter running for a long time...