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 Forum index » DIY Hardware and Software » Developers' Corner
Sub Oscillator Questions
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Zoniq



Joined: Jun 21, 2018
Posts: 1
Location: Canada

PostPosted: Sun Jun 24, 2018 5:19 pm    Post subject: Sub Oscillator Questions Reply with quote  Mark this post and the followings unread

Hello everyone, I've been searching for ideas on sub-oscillator. I don't have enough background to be able to understand the concepts tho' thus my questions.
Looking at the Sub-oscillator i.e Juno60(and others) which is basically your lowest freq f/8(16')/2 to obtain (f/16)32' added to the pre-filter mixer, whereas other sub-oscillator(modulars) seem to mix/add more frequencies together, is this like adding/mixing all the footages together?
My idea was to do a smooth sweepable footage from 2' to (sub) 32' (not step switched) but would this cause unwanted frequencies or harmonics?
or are these two basically the same idea ? any synths do this type of thing?

I'm sure I saw a schematic with some resistive network somewhere but can't seem to find it anywhere anymore.


thank you in advance
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VA1



Joined: Aug 20, 2018
Posts: 53
Location: Nederland

PostPosted: Sat Sep 01, 2018 8:47 am    Post subject: Reply with quote  Mark this post and the followings unread

That would be a extra oscillator.
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JovianPyx



Joined: Nov 20, 2007
Posts: 1678
Location: West Red Spot, Jupiter
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PostPosted: Sat Sep 01, 2018 2:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

The only sub-oscillator I've seen is one using a flip-flop to do frequency divide by 2 from a pulse or square output of another VCO. This will pitch sweep when the driving VCO is pitch swept, but it cannot sweep by itself. This type of sub-oscillator is not really an oscillator at all, though synth vernacular calls it that. It's also known as "sub-harmonic". A sub-oscillator of this type tracks the driving VCO perfectly.

To separately sweep, you will need to use a VCO that can reach the low pitches you want. Unlike the flip-flop method, using this additionall VCO method, the bass oscillator will track only as well as it is tuned and calibrated.

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