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 Forum index » DIY Hardware and Software » YuSynth
Minimoog Wiring
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Thu Jul 02, 2009 11:28 am    Post subject: Minimoog Wiring Reply with quote  Mark this post and the followings unread

Just a quick and probably very simple one:

I can't see the 1V/Octave input jack on the schematic, I can see a third CV input though. Is the CV3 input jack the 1V/Octave input? Looking at the schematic it looks to be just the same as CV2... or maybe I'm misunderstanding what CV2 controls....

Sorry for the newbie post!
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yusynth



Joined: Nov 24, 2005
Posts: 1221
Location: France

PostPosted: Thu Jul 02, 2009 12:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's the same thing, you can use either one or the other for 1V/octave or CV control. As you can see on the schematic the input resistors are all 100K therefore the CV inputs are all similar and exchangeable.
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Yves
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Thu Jul 02, 2009 1:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

It appears I have some sizeable gaps in my modular synth knowledge! As I understand it:

CV1 - controls the cutoff frequency of the filter
CV2 - the same as 1V/Oct
1V/Octave - controls the pitch of the sine wave generated by the emphasis

Is this correct? So what happens if I have CV connected to both CV2 & 1V/Oct?

Apologies for the rather basic questions....
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yusynth



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PostPosted: Thu Jul 02, 2009 1:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

CV1, CV2 and 1V/OCT inputs are all controlling the cut-off frequency of the filter. The voltages at these inputs are summed up and determine the cut-off.
Why do we have that much inputs doing basically the same thing ? It lets you have a keyboard CV connected to the V/OCT input, an ADSR to CV1 and for example a LFO connected to CV2.

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Yves
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LetterBeacon



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PostPosted: Thu Jul 02, 2009 3:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Right, I see. So if I had all three connected at the same time, I would get all sorts of weird modulation of the cutoff frequency?

It's all coming together in my head now!
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yusynth



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PostPosted: Fri Jul 03, 2009 3:57 am    Post subject: Reply with quote  Mark this post and the followings unread

LetterBeacon wrote:
Right, I see. So if I had all three connected at the same time, I would get all sorts of weird modulation of the cutoff frequency?

It's all coming together in my head now!


It's just like the genuine Minimoog, the CUT-OFF is controlled by the keyboard (tracking), by the envelope generator and also by the modulation by VCO3. You can obtain either plain vanila or weird modulations.

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