ThreeTom Modular - Steve's MS-22 Dual VCF (4HP)

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tverscho
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ThreeTom Modular - Steve's MS-22 Dual VCF (4HP)

Post by tverscho » Fri Nov 29, 2019 10:10 am

Hi, my name is Tom, and I’m the guy behind ThreeTom Modular Synthesizers, a small Eurorack business based in Belgium. The past few months I've been developing a rather unique take on a dual VCF module. As I'm getting ready to release, I thought I'd make some noise about it here :

Steve's MS-22

A dual voltage controlled filter (inspired upon the classic Korg MS-20 OTA design) with an innovative modulation matrix and one of the highest function-to-hp ratios in the land of Eurorack. This module was inspired by many pleasant chats with tech journalist Steve O’Hear and is currently being prepared for release. Have a look below at the pictures, demos, specifications and block schematic!

Image

Please note that the final units will have black knobs for all controls!

Specifications
General features
  • Dual VCF inspired by the Korg MS-20 OTA filter
  • Low-pass (12dB) into high-pass (6dB) configuration
  • Innovative modulation matrix allows CV control over all parameters
  • Cut-off frequencies can be linked, resulting in a band pass filter with controlable bandwidth
  • Bipolar monitoring LEDS for the LP, HP, resonance and gain CV signals
  • One of the best functionality-to-size ratios in Eurorack with a width of 4 HP and a depth of 45 mm
Connections
  • Filter input
  • Filter output
  • Frequency CV input (FCV)
  • Auxiliary CV input (ACV)
Controls
  • LP cut-off frequency (“frequency”)
  • HP cut-off frequency / BP bandwidth (“spread”)
  • Resonance : from mild to screamy
  • Gain : from warm to asymmetrical saturation
  • LP Frequency CV (FCV) attenuator
  • Auxiliary CV (ACV) attenuator
  • LP-HP link switch : 0%, 50% or 100%
  • Modulation Matrix switches, routing ACV to HP cut-off / spread, Gain and resonance : +ACV, off, or -ACV (inverted)
  • Calibration trimmers for the HP and LP filter are available from the side of the module.
Modulation
  • Designed to work with unipolar +5V or bipolar +-5V modulation sources
  • Will also take unipolar and bipolar 8 and 10V modulation signals, but this results in a smaller usable range on the ACV and FCV attenuators
  • Low frequency and audio rate modulation of all parameters
  • Bipolar monitoring LEDs (green: positive, red: negative) for all CV destinations (LP cut-off, HP cut-off / spread, resonance, gain)
Construction
  • 4 HP wide
  • 45 mm deep (skiff friendly)
  • High quality aluminum knobs with grippy surface
  • 2 mm thick matte black front panel with white and metallic print
  • A tasty 4-layer PCB sandwich, containing 350+ components
  • Recessed power connector, avoids your power cable from adding to the module depth
  • Protection
  • Reverse power protection
  • Buffered high impedance inputs
  • Output is protected by a 1K output resistor
Power consumption
  • +12V : 100mA max
  • -12V : 100mA max

Demo videos

[video][/video]

[video][/video]

[video][/video]

[video][/video]


Audio demo
Graciously recorded by Mr. Steve O'Hear

https://soundcloud.com/threetom-modular ... -ms-22-dub
More can be found here : https://soundcloud.com/threetom-modular ... udio-demos

Availability
If no cataclysmic events occur, I hope to release a batch of 10 units half December, price TBA

More info on http://www.threetom.com

Please feel free to ask any question either here or over e-mail.

Regards,
Tom
Last edited by tverscho on Tue Dec 03, 2019 7:59 am, edited 1 time in total.

soh
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Post by soh » Fri Nov 29, 2019 1:09 pm

Thanks for the mention, Tom. I can confirm it is a great little filter (I bought the first one).

- Steve
https://techcrunch.com/2019/09/28/meet- ... f-modular/

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Tonescape
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Post by Tonescape » Sat Nov 30, 2019 3:27 am

That modulation matrix is a great idea, well done sir!

I generally like what you have done here, will be watching this space.

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tverscho
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Post by tverscho » Mon Dec 02, 2019 7:22 am

Tonescape wrote:That modulation matrix is a great idea, well done sir!

I generally like what you have done here, will be watching this space.
Thanks!

So, maybe you've seen it on my website already, but here's a block schematic of the module, showing the possibilities that the modulation matrix has to offer :nana: 8-) .

Image

Image

antonins
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Post by antonins » Wed Dec 04, 2019 7:37 am

seems nice !

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Paranormal Patroler
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Post by Paranormal Patroler » Wed Dec 04, 2019 2:12 pm

I like the design, the looks, and your general aesthetics. Nicely done!
All rights reserved; all wrongs reversed.

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tverscho
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Post by tverscho » Fri Dec 06, 2019 6:40 am

Hi guys, thanks for the kind comments!

Check out the last awesome demo video for Steve's MS-22. In this video I'm showing what you can expect from the MS-22's resonance. Have a listen to the awesomely complex duophonic drones and pings in this video, demonstrating the MS-22's undeniable versatility! :)

This video is the last one before the MS-22's release, approximately a week from now. There will be a batch of 10 units available, price to be announced upon release.

[video][/video]

ookrsia
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Post by ookrsia » Fri Dec 06, 2019 2:10 pm

Cool. Keeping an eye on this.

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tverscho
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Post by tverscho » Fri Dec 13, 2019 4:37 am

Hi guys, I'm happy to announce that Steve's MS-22 has now officially been released.

https://www.threetom.com/news/threetom- ... ves-ms-22/

I currently have a batch of 10 units available at 225 EUR/unit + shipping :banana:

Also, if you want to dive a bit deeper into the nitty gritty of the module, have a look at it's spanking new 18-page manual 8-) : https://www.threetom.com/wp-content/upl ... -dec19.pdf

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paperCUT
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Post by paperCUT » Fri Dec 13, 2019 6:07 am

Ordered! Cant wait 8-)

thor.lucas
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Post by thor.lucas » Sat Dec 14, 2019 1:11 pm

Fancy seeing you here! Hi!

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tverscho
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Post by tverscho » Mon Dec 16, 2019 3:35 am

thor.lucas wrote:Fancy seeing you here! Hi!
Hi there Thor! :)

On a side note, the assembly guide and BOM can now be found here : https://www.threetom.com/products/steves-ms22/#MS-22_DIY

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Tonescape
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Post by Tonescape » Mon Dec 16, 2019 5:05 am

Congrats on the release, as an aspiring circuit designer I see the amount of work that went into this.

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