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 Forum index » DIY Hardware and Software » YuSynth
VCF with voltage controlled resonance?
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minisystem



Joined: Nov 16, 2012
Posts: 35
Location: Toronto

PostPosted: Sun Jul 13, 2014 7:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

rhdf wrote:
Nice solution. Im planning to build something similar to you, but instead of pots feeding cv to the filter i'm planning to control it from a microcontroller.
(and in the end having 2 moogfilters and 2 SP on the same board + digital routing so i can have 2 (different) filters in parallell or series)

How did you solve the CV in for Frequency? Just feed 0-10 V or a simple buffer instead of the pot


The frequency just takes 0-10V in.

My ultimate implementation will use control voltages generated from a DAC. I use a single 14 bit DAC and cycle the needed control voltages through a multiplexor and corresponding sample and holds. The output of each sample and hold goes directly into the CV input.
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rhdf



Joined: Jul 11, 2014
Posts: 7
Location: Sweden

PostPosted: Mon Jul 14, 2014 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Great.

My plan (note:plan) is to route a "frequency-cv" and "resonace-cv" to the board. Then a "dc-mixer" for taking care of the cv 1+2 and v/oct.
(CV1 will be hard-routed to ADSR, CV2 A part of some kind of routing matrix.)

On a single board i will try to cram in 2 Moog-filters and 2 SP.
The filters vill be grouped so i can have for example a moogfilter parallel with a SP, or 2 moogfilters in series.

I noticed that both filters have "input buffers". Would it be possible to replace them with one shared for all 4 filters, since they share the same VCO mix (or rather is what handles the vco-mix")
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