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 Forum index » DIY Hardware and Software » YuSynth
VCO Strange Waveshaper Behaviour
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Arda Eden



Joined: Nov 14, 2020
Posts: 10
Location: Turkey

PostPosted: Sun Dec 19, 2021 7:45 am    Post subject: VCO Strange Waveshaper Behaviour Reply with quote  Mark this post and the followings unread

Hi there,
Previously I built the Simple VCA and Wavefolder module from YuSynth and I am very happy with them. Recently, I built the YuSynth VCO module. Everything is OK except for one thing. I tried everything to properly setup TRI and SINE waves but there's a ripple on the positive top edge of both TRI and SINE waves. SQR works perfectly. The oscilloscope screenshots are attached
Any ideas?
Thank y'all.


tri.JPG
 Description:
The triangle wave. Nearly 4 volts peak to peak.
 Filesize:  38.18 KB
 Viewed:  121 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

tri.JPG



tri_and_saw.JPG
 Description:
TRI and SAW together. Maybe gives an idea.
 Filesize:  46.99 KB
 Viewed:  118 Time(s)
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tri_and_saw.JPG


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gabbagabi



Joined: Nov 29, 2008
Posts: 651
Location: Berlin by n8
Audio files: 23

PostPosted: Mon Dec 20, 2021 11:06 am    Post subject: Reply with quote  Mark this post and the followings unread

this is kind of of normal behavior
(for all saw-vco`s)
(if you need a perfect triangle you need to build a triangle core vco)

you can play around with C12 (47pF),
i have used 10pF for instance
important is, that you listen to it, if you like what you hear - leave it like that

in a vco the sound important,
if it is a LFO you have to check if that error is audible, mostly is not (you can only see it on your scope)

cheers
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Arda Eden



Joined: Nov 14, 2020
Posts: 10
Location: Turkey

PostPosted: Mon Dec 20, 2021 11:12 am    Post subject: Reply with quote  Mark this post and the followings unread

It is actually audible at the high end. I will check the cap. Thank you my friend.
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Arda Eden



Joined: Nov 14, 2020
Posts: 10
Location: Turkey

PostPosted: Mon Dec 20, 2021 12:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

I tried various caps and 680p was the best (this is far beyond 47p). Lowering the cap increased the ripple. The ripple is gone but as the frequency increases amplitude goes down. Not a perfect solution but acceptable.
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