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

[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.



[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 !!!

[KetamineFix]

Still very pretty.

[Adeptmind]

I dont think this is an oscilloscope.. they usually have a line all the way across... this looks like a phase scope we use to check if things are in phase or not.. it may be a function that is on one, but I don't think this is being used as an oscilloscope in this video

[uploadJ]

@Adeptmind says: "I dont think this is an oscilloscope.."

You're probably right: The proper name is "oscillograph", however, Tektronix marketed it for about 10 years as a "Model 465 Oscilloscope" ...

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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.

[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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[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...

[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

[iluvbuckethead]

I want one

[TrickyNekro]

That add on you have, is it a wave function generator? I'll buy a 465b these days, and if I remember right it does has this add on

[uploadJ]

The add-on: its a DMM -

- and it also functions as time delay readout on the scope (if selected).

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[dimavj]

Sorry, ?ive forgot, you must split Left and Right from the original sinthesis, means: different waves in every side!

[dimavj]

Hi UploadJ!,

Nice osciloscope, but if you want to see better figures you've got to try with pure tones, sawtooth waves, squarewaves and combinations, with no FX, this cloud is caused by reverbs and spatial fx of the music and it comes no clear... try with a sinthesiser, or a virtual sinthesiser, you will enjoy!

A.

[uploadJ]

Yes, precisely, which is why in the description section I include a reference to the msu . edu site which gives a tutorial on basic Lissajous pattern formation, but this video is meant to display the complex Lissajous patterns produced by a particular song titled "It's A Dream".

There are many youtube videos showing basic Lissajous, but few that show complex music in Lissajous form.

Thank you for commenting and please stop by again.

[uploadJ]

Old-time RADAR operators used to be susceptable to a condition known as 'scope dope' when sitting in front of a PPI display too long; I think the same might be true when watching this image dance on the screen ...