[Debraj] needed a simple signal generator for a project he was working on, but didn’t have one handy. He found that the easiest and cheapest way to get clean, reliable signaling was by using something ...

I'm trying a science experiment with my kid, and it's failing, thus reducing my reputation as Super Dad. I have this nifty tuner/tone generator app on my iPhone. If I ding the glass or run my finger ...