Posted: Sun Oct 10, 2010 2:40 pm Post subject:
MFOS sv-vcf's Built in The Netherlands & Southern Scotland Subject description: Skrog Productions & wmonk build a filter
Hello
While in the chat room , i learned that wmonk was building a mfos 12dB/oct. vcf, at the same time as me , yay .
I've finished my one over the weekend , a couple of silly wiring mistakes fixed now and it's working well , i'll post some mp3's in a few days .
this is the 3rd mfos state variable vcf i've built for the blue wardrobe , this time i used red box polyester 'Wima' caps mostly throughout and i really like the sound , slightly more aggressive sounding than an older one i built with polystyrene caps for C2 & C3.
I modded the audio input section of the board to make an 8 channel mixer (5 extra 1M resistors & 100Nf caps) .
a very handy filter.
Dave.
12dB VCF front panel.JPG
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12dB VCF rear.JPG
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Sounds great Dave!
I would have expected that you would be way faster then me, hehehe. Still awaiting my order for most of the capacitors. In the meantime, a picture of the panel.
Cheers,
Woody
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Months ago in the year of the Lord 2010 I started this project. I guess now the year off the Lady started, it goes faster.
My module was finished on January 8th 2011, and it sounds great
I used FKP capacitors for C2 and C3 (metallized polypropylene film)
The pcb is attached to the panel with an L-bracket. Sounds have to be recorded, will do that next week.
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Posted: Tue Jan 11, 2011 9:44 am Post subject:
mfos 12db filter Subject description: input volume
Hi great modules guys!
wondering if anyone can give me a tip about mine, the output volumes are noticably quieter than my other filters. Could anyone tell me which resistor i could change and an approriate resistor value to fix it with, to boost the output volumes.
I noticed that as well , i think it's to do with the state var. vcf using 1 LM13700 (6dB per side) , the 24dB filter obviously uses 2 LM13700's and is louder , i simply turn my vca up a little to compensate.
Unless you build 3 pre-amps maybe , one for each out (Ray has info on op-amp gain calculations in his how to / synth 101 pages on the mfos site) or you could run it through a simple vca to boost it.
thanks for your speedy response, i should have known it wouldn't have been so straight forward as a resistor (maybe wishful thinking!). Thanks for the advice-have you got a link to your pics of your modular anywhere? I've only seen bits and pieces-it looks really pro. How long you been building it? I've been building mine for about a year and just finished my first cab, i'm gonna post up some pics soon. My wiring defo needs some work but that will come with time they turn into such a big project you need to be multi skilled-the modules i've seen of yours all look compact and neat though.
Time for some samples.
The first one is a filter sweep as Dave did, using different settings of resonance. Every setting of resonance is played twice, with one having the band pass output inverted in the mix, the other all same polarity (those are somewhat more quiet).
The second is a sequence, again the sound source is a SN Voice pulse output. Using the different ouputs of the filter, first lopass, then bandpass, then highpass.
Last one is a fun trick with the VC Resonance to accent notes. Used gates to do this. Same sequence.
Have fun listening, I can really recommend this module!
Oh, I know I'm using a 12dB/Oct filter for a bass sound, just wait till I get my Oakley Superladder done
Cheers,
Woody
20110115-filtersweep.mp3
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Filter sweep. Sound source is the SN Voice pulse out.
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20110115-filteredsequence.mp3
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Sequence with the MFOS SVF. Different output, different sound.
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20110115-sequence-vcresonance.mp3
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And the last one, same sequence with VC Resonance turned up, and played with gates. :-D
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