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 Forum index » DIY Hardware and Software » Developers' Corner
Dual TB303 VCO going in sync problem.
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VA1



Joined: Aug 20, 2018
Posts: 67
Location: Nederland

PostPosted: Fri Dec 14, 2018 7:25 am    Post subject: Dual TB303 VCO going in sync problem. Reply with quote  Mark this post and the followings unread

Hi, i have this problem :

https://www.youtube.com/watch?v=Ome2DR2pmNY&feature=youtu.be

Anyone seen something similar ?, or maybe know how to fix this ?
thanks
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ringroad



Joined: Feb 28, 2012
Posts: 37
Location: Coventry, UK
Audio files: 1

PostPosted: Sun Dec 16, 2018 12:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Are they sharing the same ground? Your description sounds similar to the symptoms that Broadwave described when making a pair of Arp Odyssey oscillators
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VA1



Joined: Aug 20, 2018
Posts: 67
Location: Nederland

PostPosted: Mon Dec 17, 2018 9:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi, thanks for the reply.
Yes they share the same ground, and its in breadboard,
maybe when soldered it is better ?
i will look into your link, thanks.
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VA1



Joined: Aug 20, 2018
Posts: 67
Location: Nederland

PostPosted: Tue Dec 18, 2018 8:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Great info.
I was planning on making 2 oscillators in 1 quad opamp circuit,
now i am making each oscillator on individual card with seperate trace to the PSU.

I am also making a waveshaper and sub oscillator on the same card,
with seperate ground just to be sure,
1 card with 2 ground lines.
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