Lissajous Figures

7:17 pm Projects

My new CRT driver board is coming along rather nicely. Tonight I tested it out with a 5″ CRT. It uses a P7 radar phosphor so it looks bluish white with a sickly yellow persistence.

5" Cathode Ray Tube - Lissajous Figure

The pattern is a Lissajous figure (LISS-uh-joo). Take two waveform generators and connect one to the X input and the other to the Y input, and you get all sorts of interesting patterns. Since the CRT driver board is not available as a kit (not yet, anyway!) you can duplicate this with an oscilloscope and two function generators.

There’s some interesting math behind Lissajous figures, but I’m more interested in building 3KV power supplies.

6 Responses
  1. Kevin Groce :

    Date: June 9, 2011 @ 6:25 am

    Would love a kit of this some day 😉

  2. peter :

    Date: July 10, 2011 @ 6:41 am

    when will the kits be done?

  3. eric :

    Date: August 18, 2011 @ 10:11 pm

    Still working on fixing some last minute design issues…

  4. paul :

    Date: May 9, 2012 @ 10:52 pm

    question. Whats up with the 4:20 on your clock? Is this a standard clock show off time or are clock makers all just a bunch of pot heads? I ask this because I’ve seen it displayed on some clock patents.

  5. eric :

    Date: June 29, 2012 @ 9:13 pm

    Nah, it’s just to distract the trolls.

  6. Joaquin :

    Date: October 15, 2012 @ 6:32 am

    How is the crt driver kit progressing? Thanks.

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