current projects - hale

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

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dksynth
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current projects - hale

Post by dksynth » Mon Nov 19, 2018 7:26 pm

I'm putting this post up as an "all in one place" to share mockups, schematics, and BOMs of things I've been working on.

PCB/Panel sets are going to be available from the usual suspects in the near future...and for built prices contact me directly via PM.

Please note that any original Serge circuits are posted for my own personal use only with notes and mods that might be useful to others. Occasionally I will have extra PCBs but I am not making these for resale.

Everything is for LW format.

So far over these past couple months I've done:

CEM3340 VCO - verified

Inspired partially by the digisound implementation but several changes became necessary:
-SINE shaper is changed to the usual differential transistor pair. Values are for +/-2.5v output. If you want a different amplitude, you will have to do some math.
-PWM control was insufficient. rectifying buffered CV processor added.
-Hordjik tuning scheme added. notes here: http://www.alfarzpp.lv/eng/sc/Tuning%20the%20AS3340.pdf
-Not sure yet about how best to do the hard sync, the datasheet implementation as used in the digisound was supposed to have some processing and overdrives the sync pin. Right now I've attached the + point through a 2k2 resistor to the sync jack and that works.
-All outputs buffered
-REF02 +inverting buffer provides clean +/-5V rails and -5v rail powers CEM3340 chip. There is a jumper option for the main tuning pots to use them OR power rails as CV source.
NOTES: This has only been tested with coolaudio 3340. I'm waiting for other brands to come in to see if values need to be changed.

Image

Image

Nomad roland-inspired filter - verified

-middle-years roland filter with sk30 buffers and feedback
-borrowed pole mixing and VCA ideas from mutable instruments' ripples
-component values in several areas can be changed to emulate different roland filters
-Voltage controlled resonance

Image

SK20 dual sallen key MS20 filter - verified, new design pending

-dual version of original MS20 sallen -key KORG35 chip filter.
-link and HP/LP switches
NOTES: Verified SMD layout but extremely sensitive to interference, capacitors in filter core are microphonic. Redesigning to use KORG35 chip reproductions and isolating things to improve noise immunity.

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Ornament and Crime for 4U - verified

-Ornament and Crime module for 4U
-New panels have orientation changed to be more in line with Serge standard

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new panel:
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RES EQ - verified

-modded to isolate upper/lower combs or stock behavior with jumper settings
-personal use, schematic posted
NOTE:Upper/lower comb buffers have been swapped to inverting and these have optionally been patched into the feedback side of the EQ knobs. this eliminated the bleed between combs and higher resonant settings.


Image
Image


Triple Bandpass Array - pending verification

-inspired by serge triple bandpass but using different, clean SVF core

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MONSOON 4U:

https://github.com/dksynth/MONSOON-4U
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Last edited by dksynth on Mon Sep 23, 2019 9:51 am, edited 8 times in total.

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raisinbag
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Post by raisinbag » Mon Nov 19, 2018 9:25 pm

YES you know I'm down for it!!!! :sb:

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dksynth
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Post by dksynth » Tue Nov 20, 2018 6:06 pm

upside down O_C confirmed. I think this will be the "standard build" .... it is much nicer to use with how other serge is usually laid out....

Image

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J3RK
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Post by J3RK » Wed Nov 21, 2018 3:50 pm

I definitely want that O_C!!!
Are you lemon? Does your head come to a nub?

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Post by meatcliff » Wed Nov 21, 2018 7:50 pm

great looking work!

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Post by ashleym » Thu Nov 22, 2018 1:05 pm

I will be interested in a couple of these. I am in the UK (unfortunately drifting away from the coast of mainland Europe). Will you be shipping overseas? If so, I will message you.

TIA

Edit, any thoughts to add this to your thread in the DIY section in case people don't look at both?

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dksynth
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Post by dksynth » Thu Nov 22, 2018 7:34 pm

ashleym wrote:I will be interested in a couple of these. I am in the UK (unfortunately drifting away from the coast of mainland Europe). Will you be shipping overseas? If so, I will message you.

TIA

Edit, any thoughts to add this to your thread in the DIY section in case people don't look at both?
shipping overseas is fine but I'm in canada and there is a postal strike on right now. Some of the usual synthDIY shops have inquired about having a couple sets of different things, might be best to wait until that all gets sorted out since those guys will 100% have cheaper/faster shipping than I will.

I'm posting projects on the DIY section on specific modules as they are completed and ready for others to play with

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Post by ashleym » Fri Nov 23, 2018 2:33 am

Ok. Thanks for the reply. I’ll hang on and hopefully the route you suggest works out. Stirling work!

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Post by sawersky » Sat Nov 24, 2018 5:44 am

Do You know when the shops will have them in stock ?
More or less?
Unless You are happy to ship them to EU perhaps>

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Post by TTTTT » Sun Nov 25, 2018 11:48 pm

nice project! I was going to buy the Synthrotek DIY module but I really prefer to build it myself from scratch! so, I don't know what to buy for cyber Monday.
:roll:

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dksynth
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Post by dksynth » Tue Nov 27, 2018 9:21 am

v1.0 Ornament and Crime are up.

I have 9 PCBs and 6 panels and 3 "b-stock" panels. b-stock panels have breaks in the border or inconsistent line thickness.

edit- b-stock panels gone

PCB is 10$, Panel is 15$, b-stock panels are free with purchase of PCB.

worldwide shipping at cost.

Image

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dksynth
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Post by dksynth » Wed Dec 19, 2018 1:56 am

The Triple Bandpass exists!

Image

it is built like this with the SVF cores on removal cards:

Image

I built the first ones with Neil Johnson's 18dB 3 stage SVF mostly because I always wanted to try it ... I have more "vanilla" SVF cards on the way that will be the standard build.

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dksynth
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Post by dksynth » Wed Dec 19, 2018 12:48 pm

here is a short sound sample of the triple filter. I'm using only it as the sound source, with all three channels set to self-resonate.

This is using the 18dB SVF from Neil Johnson, which track quite well and are fully resonant.

Last edited by dksynth on Wed Dec 19, 2018 1:12 pm, edited 1 time in total.

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the bad producer
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Post by the bad producer » Wed Dec 19, 2018 12:58 pm

Nice one! :yay: Can't see / hear sounds though!?

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dksynth
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Post by dksynth » Wed Dec 19, 2018 1:13 pm

Embedding seems to be broken... swapped the link in

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Post by neil.johnson » Wed Dec 19, 2018 5:42 pm

Nice demo :tu:

Neil
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dksynth
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Post by dksynth » Thu Feb 07, 2019 9:43 am

Moving a little slower on some of my own stuff because I'm redoing the Best of CGS panel set right now to finally build these panels I have

Part of my no-more-panel-wiring vendetta.

First up, SWAMP! Might even be able to get it into a 2" boat!

Image

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It's highly unlikely that these PCBs will be fully released as they aren't my designs but I'm happy to let go of extra PCBs .... drop me a line if you are interested but it is all SMD so fair warning!

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dksynth
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Post by dksynth » Thu Feb 07, 2019 12:35 pm

.....and, coming soon thanks to Mutable Instruments' open source ethos and the generous work of mr JM Jak Plugg:

Image


4U Monsoon!

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Post by cygmu » Thu Feb 07, 2019 12:37 pm

Very nice!

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Post by Boofin Moonrocks » Thu Feb 07, 2019 5:50 pm

That's awesome!

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Post by dksynth » Thu Feb 14, 2019 5:54 pm

Exciting progress on the triple filter.... the main SVF I wanted to have in it was the ARP1047 resonator from the ARP2500. I thought it would take quite a bit of work with all those discrete gain cells but I’m happy to say it popped to life right away! Needs some fine tuning to keep it stable at high resonance through the range but it is very close... you can almost lock to single harmonics with the bandpass ... Should have some things finalized and sound samples this weekend.

Image

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dksynth
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Post by dksynth » Sat Feb 16, 2019 11:34 pm

1047 filter card is a go!

Image

Some sound samples:


-using 3 in series at reasonable high q. Blue trace is input signal. The input is almost completely inaudible and you can hear it locking to harmonics nicely.


-using just one at high resonance. A pair of saw waves are input tuned a 6th apart. I'm using a 8 step programmer to "play" the resonant harmonics.

And a flowchart of where exactly I put those compressors:

Image

The idea is, these things are capable of quite a bit of gain at higher Q levels. You have control of the input volume but not between VCF 1 and 2 and VCF 2 and 3. So the compressor limits things to something they are happier with. They can be bypassed and adjusted, you have control of Ratio, Makeup Gain and Threshold.

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Post by the bad producer » Sun Feb 17, 2019 7:43 am

Where will these - and the other projects, I'd like to get the 3340 VCO for example - be available? Will they be stocked at Modular Addict or Synthcube etc?

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dksynth
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Post by dksynth » Sun Feb 17, 2019 12:32 pm

the bad producer wrote:Where will these - and the other projects, I'd like to get the 3340 VCO for example - be available? Will they be stocked at Modular Addict or Synthcube etc?
I've sent my first box (OC, Nomad and 3340) to Modular Addict, Synthcube said they wanted some but haven't got back to me yet.

Shoot me an email if you like.

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Post by Boofin Moonrocks » Sun Feb 17, 2019 5:50 pm

dksynth wrote:
the bad producer wrote:Where will these - and the other projects, I'd like to get the 3340 VCO for example - be available? Will they be stocked at Modular Addict or Synthcube etc?
I've sent my first box (OC, Nomad and 3340) to Modular Addict, Synthcube said they wanted some but haven't got back to me yet.

Shoot me an email if you like.
Nice. Excited to buy a couple of o+c sets

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