[INTEREST CHECK] Model 1011 Discrete 4U VCO

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!
Post Reply
User avatar
SlightlyNasty
Common Wiggler
Posts: 221
Joined: Wed Nov 25, 2015 9:18 pm
Location: Adelaide, Australia

[INTEREST CHECK] Model 1011 Discrete 4U VCO

Post by SlightlyNasty »

EDIT 21/05/17: A lot of the information and links in this post are now out-of-date, so don't take them as gospel!
Order thread with updated info coming soon!


Okay, let's do this...

I think most of you have probably seen this over on the build thread, but for those who are coming in fresh I've been developing a range of new 4U modules using the Loudest Warning panel format and Eurorack electrical standard. They're all designed as complete modules with PCB-mount controls and no wiring required (well, unless you count the flyover leads to the banana sockets), as well as using a "no weird parts" design philosophy. The current prototypes look something like this:

Image

And sound something like this:

[soundcloud url="https://api.soundcloud.com/tracks/316810438" params="auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&visual=true" width="100%" height="450" iframe="true" /]

All of these modules will eventually be released, but the first one off the rank is the Model 1011 Discrete Oscillator. It's a full-featured, temperature compensated sawtooth-core VCO built with nothing but 41 discrete transistors and a small army of passive components. There's 1V/Oct, Log FM, Lin FM, Sync and Symmetry (PWM) inputs, and three outputs. Output A is crossfade-able between sine and triangle, Output B crossfades between saw and pulse, with the ability to mix in suboctave as well. The third output is the raw suboctave.

Tracking I'll tentatively describe as "fairly good", I haven't done a proper analysis of it since the very early stages of development, but I've always intended this to be a good oscillator for melodic and pitched stuff, hence the temperature and high-frequency compensation. I'll try to put together some decent demos of it performing melodic lines soon.

ImageImage

Documentation links are here, I recommend reading the manual for more info, as it's fairly comprehensive:

Model 1011 Manual & Construction Guide
Model 1011 Schematics
Model 1011 BOM

Cost will be $22 USD for the PCBs, $30 USD for the front panels. Postage will be about $4 USD within Australia and $7 USD overseas. PCBs are dual-layer HASL finish with blue silkscreen, the panels are CNC routed from 2.5mm satin anodised aluminium and multi-pass UV printed, by an Australian company that specialises in subrack hardware.

I'm keeping this an interest check as opposed to an order thread for the moment as I haven't yet ordered the latest versions of the PCBs, and I don't want to take anyone's hard-earned dineros until I've got the stuff ready to ship out. So let me know if you're seriously up for a set and we'll make this thing happen!

Some better demos of the 1011 specifically should be coming along soon, for now here's a video demoing the 2251 Multiband Filter which shows the rest of the currently-working modules. From left to right:

- Power panel.
- Model 1011 Discrete Oscillator.
- Model 1011 Discrete Oscillator (early prototype).
- Model 1411 Dual Discrete Mixer.
- Model 2111 Random Voltage Source.
- Model 2251 Multiband Filter.
- Model 1221 Dual Lowpass Amplifier
- Model 2231 Dual Asymmetric Slew Limiter

[video][/video]

The 2231 Asymmetric Slew Limiter (a versatile voltage-controlled function generator in the Serge USG / Buchla 281 vein) will likely be the next release.
Last edited by SlightlyNasty on Sat Jun 03, 2017 8:07 am, edited 2 times in total.
User avatar
medbot
Veteran Wiggler
Posts: 713
Joined: Mon Oct 28, 2013 2:44 am
Location: TX

Post by medbot »

That documentation is incredible! This is exciting for sure. May I suggest a multi-format power input for those of us not using Euro ribbon cables (yuck :hihi: )? Something like what other manufacturers use for Euro/Serge/5u compatibility would be the icing on the cake.

Oh, and you can't talk about using 40+ discreet transistors and not show a picture of the board! What a tease :lol:
User avatar
SlightlyNasty
Common Wiggler
Posts: 221
Joined: Wed Nov 25, 2015 9:18 pm
Location: Adelaide, Australia

Post by SlightlyNasty »

Whoops! You're right. Apologies to all you TO-92 fetishists:

Image
User avatar
regenbot
Super Deluxe Wiggler
Posts: 1177
Joined: Sat Aug 21, 2010 5:59 am
Location: Finland

Post by regenbot »

Most definitely interested :sb: :banana:
User avatar
autocet
Common Wiggler
Posts: 144
Joined: Mon Dec 30, 2013 9:53 am
Location: Barcelona
Contact:

Post by autocet »

TO-92 addict :hihi:

Nice work :hail:

:tu:
User avatar
tobb
Super Deluxe Wiggler
Posts: 1084
Joined: Sat Nov 26, 2011 5:41 am

Post by tobb »

wow,man these looks great!

ill probably will buy kits for sure when available.
User avatar
lasesentaysiete
Super Deluxe Wiggler
Posts: 1659
Joined: Thu Feb 18, 2016 5:23 am
Location: Barcelona

Post by lasesentaysiete »

uh, yes please! I've been hesitant to get into 4u, but this is perfect. Sounds awesome, too :sb:
User avatar
malnatim
Wiggling with Experience
Posts: 298
Joined: Sat Nov 09, 2013 6:39 am

Post by malnatim »

nice one! these look great. i'm really sold on discrete designs (from the few i've built). i agree, please add mta 156 power option. i'm not keen on euro-style power cables. i imagine most 4u builders would feel the same.
User avatar
cygmu
Super Deluxe Wiggler
Posts: 1840
Joined: Mon Feb 15, 2016 3:33 pm
Location: UK

Post by cygmu »

I will certainly buy at least one when they're ready. Fantastic stuff!
Jarno
Super Deluxe Wiggler
Posts: 3035
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Post by Jarno »

Totally dig the fact that you did a discrete VCO (TO92 fetish), and that graphical design of both the frontpanel and build doc looks great, really like the style.
User avatar
appliancide
Super Deluxe Wiggler
Posts: 1588
Joined: Fri Dec 17, 2010 9:51 am
Location: Idiocracy

Post by appliancide »

I am interested.
Permette
Common Wiggler
Posts: 132
Joined: Wed Apr 22, 2015 4:57 am

Post by Permette »

Beautiful !
Interested.
User avatar
snaper
Super Deluxe Wiggler
Posts: 1033
Joined: Mon Feb 10, 2014 12:29 am
Location: Magyarország

Post by snaper »

I have enough VCOs...I know, never say enough, but, if I count...it would be around 15-16, which is fully enough for a Buchla system.
But, I'm in for 2 sets of the LPGs!
(PCB only, cause I'd like to "buchlafy" them)
User avatar
Ceres
Wiggling with Experience
Posts: 301
Joined: Sun Oct 23, 2016 1:20 pm
Location: Local

Post by Ceres »

I love the detailed information provided.
User avatar
drew
Learning to Wiggle
Posts: 38
Joined: Tue Feb 03, 2015 1:21 pm
Location: Crystal Palace

Post by drew »

These look amazing!
I'm interested.
User avatar
oldenjon
Super Deluxe Wiggler
Posts: 1424
Joined: Sun Feb 26, 2012 1:28 am
Location: Sacramento, CA

Post by oldenjon »

No voltage control of the crossfaders? :doh:
Kidding... It's looking very nice. Excellent write up too.
I'll definitely grab one
"We all dance by ourselves, that's why we only play electronic music"

http://synthscalledbeasts.tumblr.com/
User avatar
the bad producer
Super Deluxe Wiggler
Posts: 2669
Joined: Tue Mar 17, 2009 8:43 am
Location: Clapton Pond

Post by the bad producer »

I'm just back from 'no-internet-land' and have not been here for a bit, thinking "what have I missed?" Well, glad I didn't miss this, would deffo have 2 or so!

:banana:
User avatar
tIB
Stainer!
Posts: 9660
Joined: Mon Jun 08, 2009 5:28 am
Location: UK

Post by tIB »

Add me to the interested list!
User avatar
DomMorley
Super Deluxe Wiggler
Posts: 1224
Joined: Sat Mar 10, 2012 3:27 pm
Location: UK

Post by DomMorley »

This is awesome. So pleased to see the 4u format grow.
How I fill my days: www.dommorley.com

"Your head will collapse, but there's nothing in it..."
User avatar
drip.feed
Roll it off at 30 Hz
Posts: 3183
Joined: Thu Sep 15, 2011 10:05 am
Location: Belfast, Northern Ireland

Post by drip.feed »

This is too cool for school.

What are the chances of getting the panels in white (like your OP photo) instead of aluminium..?
Dripfeed
User avatar
mothertongue
Common Wiggler
Posts: 159
Joined: Fri Jan 31, 2014 3:58 pm
Location: PL

Post by mothertongue »

This is looking really excellent!!

Steller documentation! I'm interested in 2. :party:
User avatar
CLee
Super Deluxe Wiggler
Posts: 1905
Joined: Mon Apr 05, 2010 6:49 pm
Location: Chicago
Contact:

Post by CLee »

medbot wrote:May I suggest a multi-format power input for those of us not using Euro ribbon cables (yuck :hihi: )? Something like what other manufacturers use for Euro/Serge/5u compatibility would be the icing on the cake.
I'm working on a 4U LW boat. This will be the power distro, so a 4 pin .156" would be nice (though the distro end would be .100"). Ribbon cable for power isn't really ideal.

Image
User avatar
geecen
Ultra Wiggler
Posts: 799
Joined: Thu Jan 22, 2015 7:00 am
Location: Gateshead

Post by geecen »

These look really great! The panel mounting using the knobs with holes for the bananas is the way I'm going too.

I agree with others that some kind of power combo footprint with the 0.156 on there too would broaden the appeal further.
User avatar
appliancide
Super Deluxe Wiggler
Posts: 1588
Joined: Fri Dec 17, 2010 9:51 am
Location: Idiocracy

Post by appliancide »

There is a pretty decent combo footprint that I've seen on a few DIY boards. I'm not sure who originally came up with it, but it seems like a good option for having ribbon and .156 connectors without using any additional space.
User avatar
SlightlyNasty
Common Wiggler
Posts: 221
Joined: Wed Nov 25, 2015 9:18 pm
Location: Adelaide, Australia

Post by SlightlyNasty »

Mm. I suspected the IDC connector might be contentious. I'll have a look at getting an MTA-156 on there as well, it might require a little bit of shuffling around but nothing too major. Personally I rather like the ribbon connectors, they might not be the best option out there but I think they're the most convenient. Being able to whip up a power cable in less than a minute appeals to my impatient nature.
drip.feed wrote:What are the chances of getting the panels in white (like your OP photo) instead of aluminium..?
I did agonise over that. In the end I decided that the lower price (satin anodised aluminium is a standard finish) and visual conformity with other 4U panel makers like Charlie was the wiser choice. Unfortunately the up-front production cost is quite substantial on the panels, so it's difficult for me to offer two options at this point.
Post Reply

Return to “Music Tech DIY”