Laser Oscillograph

Video Link...
http://www.youtube.com/watch?feature=player_embedded&v=yEXxJ3toHqs

From HACK A WEEK » Blog Archive » Laser Oscillograph

Skipping down...

My plan was to stick a laser on that arm, run a sine wave audio signal into the armature coil, point it at a spinning mirror, aim the reflected beam at a projection screen and it should produce the image of the waveform.

It took a bit of trial and error, as always, but I finally arrived at a design that works great.
So sit back, relax, and watch the creation of a Laser Oscillograph on my workbench.

Read More and see more Pics...
http://hackaweek.com/hacks/?p=676

That's pretty cool!:) I never knew how Hard Drives actually worked. And I'm surprised at how easy it is to display an wave form with just Smoke and Mirrors;) He mentions in the Video, using True RTA to generate his Audio Signals. It's a Software Based, Real Time Analyzer (RTA). I looked it up and it has a limited use free version for Windows. You can get it here, http://trueaudio.com/. I searched in my Fedora 14's Package Manager for "RTA" and "Audio Spectrum Analyzer". As well as a few other similar searches. But, I couldn't find any RTA Software. I'm pretty sure that I have seen at least one in the Past. But, I couldn't find it today. Still, it would be worth a look, if you run Linux, like me. I put some other Linux Audio Apps Links Below...

Don

Laser Oscillograph: [Dino]‘s one-year extravaganza is a laser oscillograph - Hack a Day; Laser Oscillograph - YouTube; HACK A WEEK » Blog Archive » Laser Oscillograph

True Audio TrueRTA Audio Spectrum Analyzer Software

true rta at DuckDuckGo

True RTA - YouTube

True Audio TrueRTA Audio Spectrum Analyzer Software 500-944

True Audio: Audio Spectrum Analyzer and Loudspeaker Design Software

TrueRTA Audio Spectrum Analyzer Download Page

TrueRTA Audio Spectrum Analyzer Software

TrueRTA Real Time Analyzer FAQ Page

TrueRTA-for-dummies - AVS Forum

Audio Spectrum Analyzer - Search in Fedora 14 Package Manager: GTKWave; aldrin-sequencer - modular music sequencer/tracker - Google Project Hosting; hexter DSSI plugin; Hydrogen | advanced drum machine for GNU/Linux; About libjingle - Google Talk for Developers - Google Code; SoundTracker; UPnP-Inspector - Coherence - a DLNA/UPnP Framework for the Digital Living - Trac

Audacity is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU Linux, and other operating systems.

audacity - Google Search

Audacity Manual

Audacity: Download

Make Your Voice Recording Better - Audacity Tutorial - YouTube

Google Custom Search

DonsDeals: If you aren't already using Audacity. My favorite free and Open Source Audio Editor and Recording App..

Audio Sound Software and info