One of my projects - the VS-1 vectorscope, in other words, an X-Y only oscilloscope, no timebase. I built it on a stripped chassis of a Radiotechnika ST-310A single channel scope that didn't work. The device has several functions:

1. audio
2. X-Y scope, BNC inputs
3. curve tracer
4. scope clock (for the future)
5. calibration mode

The vectorscope's 1kHz sine wave oscillator and curve tracer were made based on @MrCarlsonsLab patron-only curve tracer project. All else was designed and redesigned from the grounds up by yours truly.

In this video I do a vectorscope modification to make it work with all audio sources, regardless of the signal's phase or the vertical/horizontal assignment to L and R channels. Of course, some of you might mention that channels could be easily swapped if I used RCA plugs or tip-sleeve phonejacks... I used a TRS jack for its simplicity and reliability, and the ability to use a 3.5mm or 6.3mm to 6.3mm jack cable for connecting the scope to any device with a headphone output.

The scope demonstration music was created by @jerobeamfenderson1 Deconstruct: https://www.youtube.com/watch?v=rYzxHeAgE-I Oscilloscope music Kickstarter demo: https://www.youtube.com/watch?v=qnL40CbuodU&t=53s

0:00 Intro 3:33 Upgrade overview 5:17 VS-1 vectorscope on the outside 8:15 The insides 11:52 Modifications explained 14:20 Drilling the front panel 18:50 Connecting the L-R swap switch 25:50 Testing the swap mod 27:10 Deflection plates polarity reversal mod 42:40 Connecting the switches 47:20 Testing 48:57 Zapped! 50:00 Drilling and assembly 1:05:10 Final test and demonstration

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