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 Forum index » DIY Hardware and Software
VCO - wave shape restart
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isak



Joined: Dec 13, 2009
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PostPosted: Sun Sep 06, 2015 7:58 am    Post subject:  VCO - wave shape restart Reply with quote  Mark this post and the followings unread

Hi guys.

I really don't know the difficulty of this this thing I want but Ill ask anyway.
Assuming I'm using a VCO and midi2cv...
Is it possible to play a waveform from the beginning of the waveform every time I hit a midi key?
Meaning, if I'm on a saw or ramp waveform, every time I hit a midi key the sound will start from the beginning/start of the saw/ramp?

Thanks for the help Smile
cheers,
Isak E.

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isak



Joined: Dec 13, 2009
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PostPosted: Sun Sep 06, 2015 8:33 am    Post subject: Reply with quote  Mark this post and the followings unread

i just have this crazy idea.
maybe i can accomplish my idea using the sync in of the vco?
say connect a gate or EG to the sync in of the vco, will it manage to start from the peak of the waveform?

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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Sun Sep 06, 2015 8:49 am    Post subject: Reply with quote  Mark this post and the followings unread

That idea of using the gate is not so crazy, it is the way I do it on soft synths, like the G2. On a real analog there might still be a little glitch but that should not get past any envelope module after it.
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isak



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PostPosted: Sun Sep 06, 2015 11:38 am    Post subject: Reply with quote  Mark this post and the followings unread

cool! Very Happy

thanks blue hell!

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AndyR1960



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PostPosted: Tue Sep 08, 2015 12:44 am    Post subject: Reply with quote  Mark this post and the followings unread

A trigger pulse would be better than a gate - yes, it works fine via hard sync, but it may depend on your VCO design. I originally used a trigger via an attenuator and gradually increased it until I achieved reset - you don't want to suddenly put a 10 or 15v pulse where it shouldn't go Shocked

3 VCO's all starting in sync can sound pretty punchy Wink

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isak



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PostPosted: Tue Sep 08, 2015 5:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for replying Andy.

I actually want to use your Odyssy VCO design.
My beloved VCO till now Smile
So your saying to conect a trigger to the sync in of the ody but use a pot to trim it till it will reset?
A trigger I'll be using is no more then 5V, using a trigger from a midi to cv.
Do I still need to attanuate the trigger?
when thinking about it ...5V is enought to the ody Sync in?

Thanks Andy

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AndyR1960



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PostPosted: Tue Sep 08, 2015 6:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm not at home for a while (on holiday), but if my memory serves me correct, I ended up with a simple transistor switch - Have a look at the Oddy's VCO 1 schematic... R132, R133, 2N3904 (sync out VCO1) - Duplicating that circuit should allow a 5v pulse into R132 to reset VCO2.
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isak



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Posts: 814
Location: Israel
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PostPosted: Tue Sep 08, 2015 7:39 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm using the single board, not the dual.
But I have the dual on my comp so I will have a look.

Cheers and enjoy the holidays Smile

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