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Simple VCF to replace the MFOS SynthDIY Filter?
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Varoudis



Joined: Dec 03, 2009
Posts: 26
Location: London

PostPosted: Sun Aug 17, 2014 6:54 am    Post subject: Simple VCF to replace the MFOS SynthDIY Filter? Reply with quote  Mark this post and the followings unread

Hi all,

Any pointers to a simple VCF to build alongside the MFOS SynthDIY that Im building?

The original one seems to be either really subtle for my taste or I tryed bulbing it 2-3 times without luck. A fellow EM, very helpfully did some simulations and confirmed the subtleness.
(Maybe its me of course, dont get me wrong!)

So, Any pointers for a schematic?

(I have attached the CVCF Im trying to replace.)


Screen Shot 2014-08-17 at 14.53.00.png
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Screen Shot 2014-08-17 at 14.53.00.png


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gdavis



Joined: Feb 27, 2013
Posts: 155
Location: San Diego

PostPosted: Sun Aug 17, 2014 12:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ya it's got a gentle slope which even tapers off at higher frequencies which is probably why you hear it as "subtle".

Low pass filters for synths are usually either 2-pole or 4-pole (12db/oct or 24db/oct). In general a 4-pole filter will be more aggressive sounding.

There are a lot of different filter designs with different sound characteristics, personal preference is a big part choosing one and people often collect different filters for variety.

The Moog transistor ladder filter is a classic 4-pole low pass which yusynth has a nice implementation of. That's the only filter I've built, hopefully other people will give some other suggestions.

MFOS also has a 24db/oct filter and a 12db/oct state variable (combines LP, HP and BP in one).

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bubzy



Joined: Oct 27, 2010
Posts: 554
Location: United Kingdom
Audio files: 62

PostPosted: Mon Aug 18, 2014 7:24 am    Post subject: Reply with quote  Mark this post and the followings unread

im not sure that simple is going to suit your needs, if you are looking for a particular sound, it's likely that you are going to have to spend a bit more time building and a bit more cash on the parts.

I've built 4 of these and find them to be a nice versatile filter, and fairly easy to build too

http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html

ken's pretty good with shipping boards too, or of course the schematic is there if you wanna build on perf etc.

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Varoudis



Joined: Dec 03, 2009
Posts: 26
Location: London

PostPosted: Tue Aug 19, 2014 3:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi all and thanks for the replies.

I undestand the need of a nice design if it was for a stable/1Voct etc modular.
This is why I said about a simple (not really 1Voct or anything) VCF.

I saw some EMF designs on Fonik's website so ill probably replicate one of them for the MFOS SynthDIY fx modular.

Thanks
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