Understanding Saw Animator imperfections.

[reve]

(Sorry, I thought I was adding images right... clearly I was wrong)

Hey everyone.

So after a couple years of (successfully!) using my YuSynth Saw Animator, I finally got around to buying an oscilloscope... and trimming it properly.

What's weird is that different VCOs behave differently. Here's a shot of an MFOS VCO as trimmed as I could get it:

[img]http://electro-music.com/forum/phpbb-files/ds0000_108.bmp[/img]

Here is a TH XR-VCO with those same settings (this is, given the description on Yves' page, what I would expect):

[img]http://electro-music.com/forum/phpbb-files/ds0001_145.bmp[/img]

Here's the same TH VCO as trimmed as I could make it:

[img]http://electro-music.com/forum/phpbb-files/ds0003_248.bmp[/img]

So. Why the funny triangle shape on that first one? My initial theory was that the fall time was longer on the MFOS VCO, but after measuring that doesn't seem to be the case. I note that the MFOS VCO actually delivers more like 11.5 Vpp -- could that be the reason?

Again, no problems with the unit, just trying to understand things better.

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DS0000.BMP
Description:	MFOS VCO as trimmed as possible.	Download
Filename:	DS0000.BMP
Filesize:	16.3 KB
Downloaded:	111 Time(s)

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DS0001.BMP
Description:	TH VCO untrimmed.	Download
Filename:	DS0001.BMP
Filesize:	13.35 KB
Downloaded:	104 Time(s)

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DS0003.BMP
Description:	TH VCO trimmed	Download
Filename:	DS0003.BMP
Filesize:	17.09 KB
Downloaded:	107 Time(s)

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[yusynth]

As stated on the saw-animator page the module expects a sawtooth signal balanced around 0V, that is ranging from -5V up to +5V. Unbalanced sawtooth wont give a good result (MFOS VCO ?)

To help us understand the graph may be could you telle which curve (yellow, blue) correspond to which signal.

[reve]

[yusynth]

[reve]

Yves, thank you so much for taking the time to respond -- I appreciate it greatly!