Oscillofun Displayed 5 Different Ways

Thanks to codemsan for giving me the link to this song.

Link http://www.darkbits.org/~per/music/oscillofun.flac

This shows how the "Oscillofun" sound clip looks when hooked up in various ways. The left green waveform shows the waveform coming from the left channel of the clip, the middle graph shows my Heathkit scope playing the song in X-Y mode, and the right waveform shows the right channel of the song. The bottom left CRT is a 5" type from a black and white TV connected to a solid-state stereo amplifier with the speaker outputs driving the yoke coils only. The right view shows the same CRT connected to the same amplifier except with the "B Speakers" turned on, which I believe puts speakers in parallel with the yoke coils. Notice how this changes the waveform and amplitude considerably.
This is an excellent demonstration that current DOES NOT follow voltage when AC is applied to an inductor. The movement of the electron beam in the 5" black and white CRT depends on the current flowing through the coils, rather than the voltage applied (the reverse is true of the Heathkit scope). In order for a waveform to display properly on a magnetic-deflection CRT, the voltage waveform coming in must be "modified" so that the resulting current waveform is correct. This is how vector-based video games used to work with magnetic-deflection CRTs. All the voltages generated by the computer were such that they displayed the proper graphics when run through the yoke coils. These voltages driving an electrostatic CRT would not produce the same results.

Category:

Science & Technology

Tags:

• oscillofun
• oscilloscope
• audio
• music
• visualization
• sound
• vector
• graph
• hack
• diy
• vacuum
• tube
• electronics

[tadgesualdo]

Either my computer speakers are reversed or your L/R displays are. I love the bottom two displays. This music is very interesting where I can get it? The phase shifts are fasinating, I listened three times and still can't wrap my head around it all, the visuals really help though. Oh and I love the 6BQ5 tube, have an amp based on this tube myself.

[CameramanLink]

@tadgesualdo I will post the link in the description for the song. It's in flac so you need a player for it (like VLC). The left and right don't really matter when it comes to displaying this song because the graphic will just be rotated. I had to flip the top middle to display the letters correctly (appeared mirrored originally). You can use Audacity to change the phase of the tracks to match your scope's input.

[AllAmericanFiveRadio]

Did you sync the video in the editor via the sound tracks? Really nice and interesting displays!

[CameramanLink]

@AllAmericanFiveRadio Yes. I found this sound clip to be quite interesting. It fascinates me that it will display a vector graph but when you listen to it, it doesn't sound like a bunch of noise but an actual song with chords and notes! I wonder how music like this is created...

[WeekendWasteMonster]

Really great video!

[finalman242]

This is amazing :D Thanks for taking the time to record it. It's the best version I've seen so far!

[codemsan]

I thought you might get some fun out of this!