So I got a few comments on this Musical Things post asking how we made that little visualizer. Honestly I don’t know who made it! But I do understand how it works! Basically the cathode-ray tube was hacked to be an oscilloscope. This is something that can potentially be done to anything that has a cathode-ray tube.

Here is a nice little video by a teenager on how to make something similar:

Disclaimer: cathode-ray tubes retain high voltage charges even after they are turned off and unplugged, you can get seriously injured if you touch the wrong things. Do not attempt anything like this unless you know basic electronics.