It’s really amazing what you can find at military surplus shops. [David] just built a radiation detector out of a DT-590A scintillation probe originally made to test if Air Force bases were ...

I got some Geiger tubes a few days ago and built a very simple Geiger counter circuit that is powered entirely through the microphone jack (microphone connection provides a little power for things ...

We can't always work alongside a pro to see what makes things tick, and that's where do-it-yourself projects come in handy. They're the entertaining alternative to learning a new skill. In this week's ...