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One so far (after a few minutes). We don't have a test source, but we were getting background before and it all stopped. I recently heard the whine when it turned on (for the first time). We just checked the solder, and there were no real problems. As I said, it still beeps when there is a contact a...

My family and I built the geiger counter a few weeks ago, and it worked fine then, but today it stopped working. No multimeter is currently available, but one may be in the future. The batteries are fine, and there is a beep when I shorted across the ends of the tube. However, it detects little or n...