"It's a Dream" - Tektronix 465B Oscilloscope showing Lissajous pattern to music

Tektronix 465B oscilloscope in real-time demonstrating a mermerizing Lissajous pattern.

This was created by setting 465B 'scope to X-Y Display mode and then feeding the Left and Right channels from the PC's sound card into the oscilloscope's X and Y inputs.

The scope is a vintage Tektronix 465B Oscilloscope.


For technical information on Lissajous patterns, see, for example, this website:

http://www.egr.msu.edu/classes/ece482/Teams/99spr/design2/web/resources/lissa...

The technotrance genre song is: "It's A Dream"

For a 'regular' display of stereo audio signal using scope in dual-trace mode instead of X-Y mode, see this video:
http://www.youtube.com/watch?v=LDho6HWKOFA


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Category:

Science & Technology

Tags:

• Tektronix 465B
• 465B
• Oscilloscope
• Lissajous
• Lissajous patttern
• Its a Dream
• dual-trace
• scope

[connectorxp]

You pot the audio signal on the probes directly ? Does the scope haves the posibilty to draw the classic waveline?

[uploadJ]

@connectorxp

"audio signal on the probes directly" - Yes, use audio cable to RCA to BNC adapter directly to Scope inputs. Scope then put into "X-Y mode".

"Does the scope haves the posibilty to draw the classic waveline?" Yes, see the video below (cut and paste onto youtube URL or see Description section of this video) for an example of normal dual-trace scope display.

watch?v=LDho6HWKOFA

BTW, thanks for your interest and the questions.

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[seanowenharnett]

Nice. I did the same thing years ago, then I had to see it in color -amazing. Took a 25" color CRT, filtered the freq's then rectified to drive the RGB cathodes. Bias it to go dark with no audio, blue for high freq's, green for midrange and red for low freq's. You can drive a yoke with an audio amp, but you need a second yoke because the yoke is necessary for the HV. Also helps to add phase shift between the X,Y yoke drive to get it more symmetrical -- get rid of the 45 degree angle.

[uploadJ]

@seanowenharnett

Wow! Good idea! May have to try this with a LabVIEW app ! Thanks for the comment.

[uploadJ]

@AdeonWriter

Yes, pls also see the 'Show More'; section where this is explained, plus a reference to Lissajous patterns at msu dot edu.

Note how many demonstrations of old, classic CRT-based O-scopes there are on YouTube! One day all these old scopes will not exist, but hopefully a few of these videos will exist, showing what can be done with such *crude* technology as throwing electrons at a screen (using High Voltage) that then phosphoresses (glows)!!

Thanks for the comment.

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[AdeonWriter]

@uploadJ If you only played the track though the X-channel, it would look like a normal oscilloscope. But it's taking the left and right channels and using the X and Y axis of the grid, so it's a 2D pattern instead of a 1D wave.

[thejollyroger1945]

Very nicely done 1!!

I've got a 465 here, might have to try this !

And to those wondering, this IS an oscilloscope, the triggering circuit is simple switched so that the horizontal sweep is stationary, hence the dot in the screen to begin with. A push of a button, or a flip of a switch ( depening on what kind of scope you've got ), and you'll see a trace again.

Thanks for the vid !!!

[Adeptmind]

@b52bombnav yes.. it is an oscilloscope.. like I said it could be a function on.. however.. it has the capability to view phase in addition to being an oscilloscope and IS indeed being used to view the audio's phase and not being used as an oscilloscope in this video. Therefore I stand by my original statement and did not need to google anything. peace

[b52bombnav]

Nope its a oscope that can do more than what you are thinking about. Why not use google to look it up before replying...