Serge VCFQ? Essential!

Discussing some incredible modules that don't quite fit into the other forum categories.

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batchas
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Serge VCFQ? Essential!

Post by batchas » Sun Oct 11, 2020 4:50 am

To me, the VCFQ is essential in a Serge system. Unique sound.

90% of the time I use the low output of the VCFQ in ping mode.
The rest of the time I used it in self-oscillation mode mainly for LFOs (kind of quadrature mode with 90 degrees phase-shifted outs).
But remember that you can use it as a VCO with at the same time a triangle, a square and a sine at each output if you want too (see next post)!

I use the VCFQ in all my percussive patches:


Here using it in a different way:


Ok. It’s also very cool as a filter :)
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batchas
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Re: Serge VCFQ? Essential!

Post by batchas » Sun Oct 11, 2020 5:13 am

As mentionned in first post, you can use the VCFQ as an oscillator with different waveforms at the outputs.
I mainly use it with BAND out sent to IN input for nice sinewaves at the outputs, but if you set Q and GAIN full CW and frequency as you wish, then patch the HI out to the IN input, you can get SQUARE at the HI out, TRIANGLE at the BAND out, SINE at the LO out. NOTCH will be a SQUARE like HI.
Be aware though that the SQUARE at HI or NOTCH outputs is 24V p-tp-p and the BAND is 22.5V p-to-p!!!
You might want to attenuate these signals depending what you do with them.
LO is ok with 10V p-to-p.
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kumakuma
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Re: Serge VCFQ? Essential!

Post by kumakuma » Sun Oct 11, 2020 6:37 am

Thanks for this!!!

allgolden
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Re: Serge VCFQ? Essential!

Post by allgolden » Sun Oct 11, 2020 8:59 am

Cool stuff! I have the euro version in the mail and can't wait to try it out. :hyper:

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Re: Serge VCFQ? Essential!

Post by croute » Sun Oct 11, 2020 9:57 am

Great!Thank you!

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dksynth
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Re: Serge VCFQ? Essential!

Post by dksynth » Sun Oct 11, 2020 12:50 pm

you can increase the ping time by matching the interstage compensation caps to the opamps used. You can also use a tunable feedback circuit on the LP feedback line with reduced interstage caps for the absolute max ring time.

That said, after I spent a good chunk of a weekend on the above changes.... it’s not THAT much of an improvement....

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Re: Serge VCFQ? Essential!

Post by wavecircle » Sun Oct 11, 2020 1:55 pm

It's glorious in it's intended form too, as the 303 example above demonstrates. I love crossfading two of the responses, sounds amazing with a modulated cut off.
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Re: Serge VCFQ? Essential!

Post by luketeaford » Sun Oct 11, 2020 2:11 pm

Excellent as always-- thanks, batchas.

Another thing I like with VCFQ is to run the pings through a VCM or comparator etc. There are so many ways to process it with the serge system that even though it's kind of a signature sound, it can be hard to pin down exactly how it's happening.

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Re: Serge VCFQ? Essential!

Post by Nisse_D » Sun Oct 11, 2020 7:54 pm

Great stuff, love your videos! The 73 filter is also a great pinger with a few mods, more or less en par with the VCFQ IMHO :)

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Re: Serge VCFQ? Essential!

Post by The Junglechrist » Mon Oct 12, 2020 12:07 am

wavecircle wrote:
Sun Oct 11, 2020 1:55 pm
It's glorious in it's intended form too, as the 303 example above demonstrates. I love crossfading two of the responses, sounds amazing with a modulated cut off.
Probably my favorite use of this filter indeed.


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Re: Serge VCFQ? Essential!

Post by jevergreen » Mon Oct 12, 2020 11:19 am

I've got a VCFQ kit on the way already, so I appreciate the teaser and conversation.
BTW, thanks for linking to this thread on the FB group.

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Re: Serge VCFQ? Essential!

Post by jevergreen » Wed Oct 14, 2020 11:14 am

As luck would have it, my kit arrived yesterday!

It's the 3U version, and in the build documentation it mentions an optional jumper + resistor that would link the cutoff and the Q, stating that it's a legacy piece of the circuit included on the new board, but it is usually left open. I got to wondering, though, what about an off/on switch across the jumper, and if 'off' what would be the effect of the resistor on the rest of the circuit? I don't have the benefit of having a schematic to look at, so I figured I'd ask.

Thanks!

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Re: Serge VCFQ? Essential!

Post by allgolden » Thu Oct 15, 2020 4:00 am

Now that I've had a couple of days to wiggle I'll just add - don't be afraid to feed/mult audio to the trigger in! It's somewhat unpredictable what will actually trigger it, but I've had some great results with processing field recordings. Fun fun fun!

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the bad producer
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Re: Serge VCFQ? Essential!

Post by the bad producer » Thu Oct 15, 2020 6:08 am

I would imagine it's pretty much the same as this, in a way it has to be or it wouldn't be a VCFQ!

https://www.elby-designs.com/webtek/cgs ... cgs112.htm
jevergreen wrote:
Wed Oct 14, 2020 11:14 am
As luck would have it, my kit arrived yesterday!

It's the 3U version, and in the build documentation it mentions an optional jumper + resistor that would link the cutoff and the Q, stating that it's a legacy piece of the circuit included on the new board, but it is usually left open. I got to wondering, though, what about an off/on switch across the jumper, and if 'off' what would be the effect of the resistor on the rest of the circuit? I don't have the benefit of having a schematic to look at, so I figured I'd ask.

Thanks!

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Re: Serge VCFQ? Essential!

Post by Karl71 » Fri Oct 16, 2020 12:35 pm

Thanks Batchas

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Re: Serge VCFQ? Essential!

Post by jevergreen » Sat Oct 17, 2020 7:45 am

the bad producer wrote:
Thu Oct 15, 2020 6:08 am
I would imagine it's pretty much the same as this, in a way it has to be or it wouldn't be a VCFQ!
Thanks for the link! Of course I could have just checked with my multimeter to see that the space for a jumper and the omitted resister are in series, so adding the extra resistor doesn't do anything by itself. It appears easy enough, so I may have to try putting those in sometime.

Here is a cross reference for finding anyone building the VCFQ eurorack kit from Thonk, which comes with a TL072 for U3.
http://randomsource.net/docs/RandomSour ... e_VCFQ.pdf

I only used one of the CS/CY caps, the one highlighted in the eurorack build doc, and things seem to be working fine, though I just started using it. What potential issue(s) would prompt the installation of one or more of the others?

It does have that special sound, to say the least!

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