> Tomorrow, the school demo will be a paper scope made out of a yard stick, a > marker, and wall-chart paper: one student holds the oscillating yard stick, > a second pulls the paper steadily, and a third times it. Afterward, they > count peaks and divide by time.
Neat. Scopes are fun. The Exploratorium has a nice exhibit. It's setup to look like a giant guitar so you start off with the idea of strings vibrating. Some of the frets are white lines on a drum you can rotate. It works amazingly well. http://exs.exploratorium.edu/exhibits/oscylinderscope/ > Next student demo is the scope made out of a laser and hard drive with a > mirror on the voice coil. [When was the last time they made hard drives with voice coils?] I don't see it yet. Are you tilting the mirror or just making a small picture? Or is there some mechanism I'm missing? > For the real scope work, we won't show the Rb to the kids; they'll get an > iPod with music on the scope, as it's more relevant to them. I like it. Is the iPod preloaded with neat "tunes"? Do you have any fancy scopes for big kids? One great way to have fun with a digital scope is to try to show the picture from a old skiers avalanche beacon. It's a short pulse of 455KHz AM modulated with a few KHz. The rep rate is about 1 second, too slow for most analog scopes. There are all sorts of opportunities for aliasing or missing a significant part of the picture. >From the initial message > As part of the SF Bay Area Maker Faire this weekend, I'll be showing a > Thunderbolt GPSDO and a FE-5680A Rubidium disciplined oscillator, both > connected to a $25 flea-market oscilloscope. Can you really get a useful scope for $25? What's it like? What's a low end A/D on a USB dongle go for? -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
