Overview
Modular analog synthesizers are musical instruments that are typically made up of discreet analog electrical circuits. These circuits may be mounted on individual panels, or may be grouped together in various chassis configurations.
While some manufacturers produce modules in sizes that no others make, there are three physical and electrical formats that are used by more than one module manufacturer - "Euro-Rack", the format used by Analogue Systems, Analogue Solutions, Doepfer and Plan B (with minor differences), "Frac-Rack", the format pioneered by PAiA and used by Blacet, Wiard and others, and "MOTM", used by Synth Tech and many other makers. Euro-Rack and Frac-Rack formats use 3U (5.25") of vertical space. MOTM uses 5U (8.75") of vertical space. Typically, this means that the Euro- and Frac-Rack modules use smaller knobs and jacks, while the MOTM modules use larger ones.
In general, european modules use 12v power and modules from the United States use 15v. There are exceptions, as well as some newer modules that use 5v power.
One of the biggest decisions you can make is whether to purchase full kits, parts, or pre-built modules.
Synth Information Sources
Electronics Parts sources
UK- Farnell
- Maplin
- Rapid
- RS Components
- One Pas Combination surface mount and through-hole proto boards
- BD Micro SMT soldering tutorial (BD Micro makes ATmega12 based microcontrollers.)
Panels, screws, cabinets, etc
- Schaeffer European source of custom panels. Download their Front Panel Design Program, design your panel and they'll make it.
- Front Panel Express North American source of custom panels. Download their Front Panel Design Program, design your panel and they'll make it.
- Modular Synth Panels Yahoo group
- Silkscreening panels
- Silkscreening supplies
- Various front panel construction methods
- McMaster screws
- Aaron's Machine Screws
- dotcom cabinets
- dotcom diy cabinet
- MOTM modules in dotcom cabinets by Larry Hendry
- MOTM in dotcom cabinet by Richard Brewster
Circuit design
Free
- ExpressPCB free software if you have them make your boards
- gEDA free - Windows, Mac, Linux
- Kicad free - Windows, Linux. (Mac not so much...)
Low to medium price
- Diptrace $75-695
- Eagle Very common tool in DIY circles, but version 5 prices have gone up. $0-1500
- Rimu PCB
Full fledged
- Altium Designer (was ProTel)
- OrCAD
- PADS
Circuit modeling
- Catena SIMetrix SPICE simulator
- PSPICE was MicroSim, now owned by Cadence (OrCad)
Oscilloscopes, meters, etc
Eurorack Synth Modular Manufacturers
Other Sites - Articles and individual web sites.
- Jorgen Bergfors
- Detachment 3
Det3 synthbook list - DragonFlyAlley Bill and Will's MOTM pages
- Scott Gravenhorst Synthaholic - creator of "Gateman" the FPGA synth and home to PAiA Fatman mods pages...
- Matthias Herrmann (Fonik)
- Chris List
- Paul Maddox
- Micro Tonal Synthesis
- Modular Synth
- Music Synthesizer
- Jim Patchell Grant Richter's DIY page Grant, of Wiard fame
- Rene Schmitz
- Scott Stites
- Seb 's Synth-DIY
- Synth.net home of many synth projects
- Yves Usson has some DIY info
There are several good books out there on the subject of analog synthesis. Check out Analog Days by Frank Trocco, Vintage Synthesizers by Mark Vail and Electronic Music Pioneers by Ben Kettlewell for overviews of the subject.
For technical information and articles about building analog synthesis circuits, check out these authors:
- Hal Chamberlin - Music Applications of Microprocessors. Digital orientation, but some good info.
- Thomas Henry - various - See "Magic Smoke Electronics" below.
- Hubert Howe - Electronic Music Synthesis
- Bernie Hutchins Electronotes
- Walt Jung - Op Amp books
- Barry Klein "Electronic Music Circuits"
- Don Lancaster - Filter design
- Forrest Mims
- Allen Strange
Retailers
There are several stores out there selling analog synthsizers. Here are a few of them:
USA
- Switched ON
- Analogue Haven
- Big City Music Studio City, CA
- Noise Bug Pomona, CA (in old Analogue Haven location)
- Nova Musik Milwaukee, WI
- Robot Speak San Francisco, CA
Europe
- Schneider's Buero Berlin, Germany
Sequencers
Sequencers are devices that output sequences of information that can be used to play notes or control other aspects of a performance. While there are both hardware and software sequencers, for the moment I am limiting this section to hardware only. Well...ok, except for one: Numerology ;-)
More infoSequencer makers
- Analogic ACS Sequencer
- Doepfer makes two sequencers:
- MAQ 16/3 three bank, sixteen step MIDI and CV sequencer
- Schaltwerk (discontinued?)
- Encore Electronics Universal Event Generatori Envelope, LFO or eight step CV sequencer
- Frostwave Fat Controller Sadly, looks like this one is out of production.
- Future Retro Mobius
- Klee Sequencer project
- Midibox kits
- Milton - four (or more) bank, sixteen step CV sequencer with async and random functions...
- MOTM-600 MicroSequencer announcement
- P3 MIDI sequencer. Sigh, also discontinued...
- Papareil MCV-876
- Signal Arts MAPS
- Spectral Audio Cyclus 3 MIDI Analog Sequencer
- Surfin Step Sequencer Click on "Electronics"
- Synthesizers.com Q960 Moog 960-style sequencer
- Technosaurus Cyclodon "World's smallest analog sequencer!"
- Zeit sequencer
MIDI-CV Converters
If you use a MIDI controller with your modular synth, you'll need some way of converting the MIDI information to the control voltages needed to communicate with your analog modules.
- Encore Electronics Expressionist eight channel converter
- Frostwave Quad MIDI to CV Plus
- Kenton PRO-SOLO and PRO-2000 converters
- Oakley midiDAC single channel converter
- Oakley polyDAC four channel converter
PolyDAC source code - Seb's Fat Controller
- Synth Tech MOTM-650 four channel converter
Quantizers
If you are using control voltages to set parameters on your analog synth, you may want some way of setting, or "tuning" your voltages so that your sounds are in tune with other instruments. You can use a voltmeter to set your control voltages or use a tuner to check the frequencies output from your VCO, but another way is to put a quantizer in your CV path. (NOTE: If you are using a MIDI-CV converter, it should quantize for you. Some MIDI-CV converters, such as the MOTM-650, have programmable tunings.)
Manufacturers
Analogue Solutions
Analogue Solutions modules fit in the "Euro-rack" case. They require plus or minus 12v and plus 5v power.
Analogue Systems
Analogue Systems modules fit in a "Euro-rack" case. They require plus or minus 12v and plus 5v power. (Doepfer power connectors are built into the Analogue Systems case.)
- Analogue Systems
- Big City Music US distributer
Anywhere Instruments
This German company makes the Semtex XL ("Felix") which is cloned from the Oberheim SEM.
ASM-1
Gene Stopp's ASM-1 project was a DIY (Do It Yourself) project. There is a follow up project, called, amazingly enough, ASM-2.
Bananalogue
Joint venture with Serge Tcherepnin, Ken Stone and Seth Nemec. Serge designs them, Ken makes the boards and Seth assembles them. (Nope, these modules don't actually use banana jacks...)
Blacet Research
Blacet modules are based on the "Frac-rack" system. They are 5.25" tall. They require plus or minus 15v power and are calibrated 1v/octave. Connections are made with 1/8" mini-jacks. See Synth Panels below if you want to use a Blacet module with an MOTM front panel.
- Blacet Research
- Dark Star Chaos mods from Dave Bradley
- Dark Star Chaos mods from Scott Juskiw
- Miniwave ROM manual
- Miniwave Socket Rocket manual
- Miniwave ROMs Matthew Davidson created these ROMs for the Miniwave. Dave Hylander is now selling them.
- Miniwave Wave256 ROM programming software by Grant Richter (pc zip file)
- Miniwave expansion board - use up to ten ROMs...! PCB by Dave Hylander. Dave also sells the ROMs themselves.
- Miniwave ROM switch board by Scott Juskiw. ROM switching via CV daughterboard.
- Miniwave mods from Larry Hendry
- Miniwave mods from Scott Juskiw
- Miniwave in dotcom format
- Time Machine mods from Dave Bradley
- Time Machine mods from Larry Hendry
- Time Machine mods from Scott Juskiw
Bride Chamber
Scott Deyo provides various parts and assembled modules.
Buchla
Beautiful, but expensive!
Cat Girl Synth
See Ken Stone.Club Of The Knobs
Club of the Knobs ("COTK") is in Portugal.
CMS - Cirocco Modular Systems
Phil Cirocco builds modules and systems and repairs ARP, Moog and EMS products.
Curetronic
This German company makes various module kits.
Cwejman
This Swedish company makes the S1 MK2 patchable synth and many Eurorack-style modules.
Cyndustries
Many custom modules in Modcan and other styles. Now famous for the $995.00 Zeroscillator. Analogue Haven has some Cyndustries modules in stock - there seems to be a fairly long queue if you order directly from Cynthia.
Doepfer
Doepfer is the largest distributer of analog modules. I've heard that everything is designed in Germany and manufactured in China, resulting in very low prices. Doepfer modules fit in the Euro-rack case and require plus or minus 12v and plus 5v power.
- Doepfer
- Doepfer Yahoo Group
- DIY page at Doepfer
- Analogue Haven US distributer
- DIY page at Analogue Haven
- EMIS music UK distributer
- A-110
Sine Wave modification by Tim Stinchcombe
Tim has several other Doepfer modifications listed at his web site.
Elby Designs
Laurie Biddulph provides a variety of boards and parts for ASM-2, AVRSYN, Pixie, Hobbit and more.
EFM - Electronics For Music
Tom Gamble runs this site and provides boards for the Wildcat, Tomcat and BassAce. NOTE: Apparently this will be the last run of BassAce boards - when this batch is gone, that's the end...
EMS - Electronic Music Studios
Creators of the Synthi A
Encore Electronics
Expressionist eight channel MIDI-CV converter and other MIDI controllers and retrofits, MOTM style Universal Event Generator and Frequency Shifter.
- Encore Electronics
- Frequency Shifter review by Konkuro
- Frequency Shifter mods from Scott Juskiw
- UEG mods (Universal Event Generator) from Scott Juskiw
Frostwave
Paul Perry in Melbourne, Australia builds several pedals and a MIDI to CV converter. Pedals include the Resonator MS-20 filter, the Funk-A-Duck Envelope controlled filter, the Blue Ringer ring modulator and the Spacebeam Theremin, which seems to be similar to a Roland D-Beam.
Future-Retro
Jered Flickinger and his father started Future Retro in 1996. Future Retro makes the Evolution monosynth and the Mobius sequencer.
Ken Stone (CGS)
Ken supplies many circuit boards for his own projects as well as for other designers.
Livewire
Euro-rack size modules. Home of the Dalek and Vulcan modulators.Macbeth
Ken MacBeth builds the M5 patchable synthesizer.
Magic Smoke Electronics
Tim Parkhurst and John Mahoney put together Magic Smoke Electronics, which is the sole source for Thomas Henry's designs and publications.
Mattson Mini Modular
George Mattson builds the Phoenix Series of micro modules.
Metasonix
Tube-based modules
Metalbox
Modules in Frac-rack sizes with Blacet-style power connectors.Midwest Analog
Thomas Henry closed up shop in 2005, but authorized Magic Smoke to carry on.
Modcan
Modcan A modules are 9" tall and 2.25" or 4.5" wide and use banana plugs. Modcan B modules use MOTM format.
Moog
What can I say? It was Dr. Bob. Great stuff here...
MOTM
See Synthesis Technology
Music From Outer Space
Ray Wilson runs this Do It Yourself site
Oakley
Tony Allgood designs analog modules as well as other projects like the TM3030 and TB-3031 TB-303 clones and the Filtrex filter bank. Oakley modules conform to the MOTM standard. Tony Allgood decided to close the shop in 2005, but there was enough demand that PC Boards are becoming available again. Tony seems to be working on another TB-303 clone too.
- Oakley Sound
- OMS-410 mods (MOTM 410 add-on) from Scott Juskiw
- OMS-902 mods (Multimix) from Scott Juskiw
PAiA
PAiA modules are based on the "Frac-rack" system. In fact, they invented it! Kits only. A really fun PAiA project is the FatMan, a monosynth that can be rack mounted or build in a table top cabinet. There are LOTS of modifications that can be done to the FatMan - it may be the most modified DIY synth in the world... And if you're in the market for a theremin, check out the PAiA Theremax kit.
- PAiA 9700 series modules
- PAiA FatMan
- FatMan mods
- c0nsumer's FatMan Plus page (same enclosure as a x0xb0x...)
- PAiA Theremax
Papareil Synth Labs
Plan B
Peter Grenader designs, builds and fixes electronics, including custom modules and various versions of the Milton sequencer. NOTE: DO NOT use Peter's buzzclick-music email address - it has been over run with SPAM. Use peter at ear dash group dot net instead.
Milton is a CV sequencer. No MIDI here! The standard design supplies four banks of 16 steps each and in theory, it can be expanded to 12 or more banks!
Schippmann
Schippmann is located in Berlin, Germany and makes the "ebbe und flut."
Serge
Modules, a whole panel at a time...
- Egres, the unofficial Serge Site (What is "Serge" backwards?)
- Carbon111 site
- Rich Gold's Serge Guidebook (zip file at Carbon111)
Studio Electronics
Studio Electronics is located in El Segundo, CA, USA and makes effects pedals and full width rack mount analog synths.
Spectral Audio
Spectral Audio is located in Switzerland. They make the Neptune II analog synth and the Cyclus 3 MIDI Analog Sequencer.
Synthesis Technology
Paul Schreiber is the creator of Synth Tech, home of the "MOTM" (rhymes with "modem") system. MOTM modules are made with the highest quality parts and designs. MOTM modules are based on the "U" rack size system. (1U = 1.75") They are 5U (8.75") tall and 1U (1.75") or 2U (3.5") wide. They require plus or minus 15v power and are calibrated at 1v/octave. Connections are made with 1/4" jacks. As of 2006, Synthesis Technology is shipping modules in FracRack format, available at Analogue Haven. NOTE: As of December 2006, Synthesis Technology is no longer supplying module kits.
- SynthTech
- MOTM module sound demos at SynthTech
- pointers to other sound demos
- Frac Rack modules
- video of board assembly automation
- Wise Guy Synth Larry Hendry's MOTM-oriented site
- Hot Rod MOTM Dave Bradley's MOTM-oriented site
- Moe's list of MOTM compatible parts
- MOTM-porium Scott Juskiw's MOTM-oriented site
- Face Plate Drawings and Patch Sheet
- MOTM 101 mods by Scott Juskiw
- MOTM 110 mods by Scott Juskiw
- MOTM 110 mods by Larry Hendry
- MOTM 120 mods by Scott Juskiw
- DB-120 add-on board by Scott Juskiw
- DB-320 add-on board by Scott Juskiw
- MOTM 410 mods by Scott Juskiw
- MOTM 480 mods by Richard Brewster
- MOTM 800 mods by Dave Bradley
- MOTM 800 mods by Scott Juskiw
- MOTM 830 mods by Scott Juskiw
- MOTM 850 using Ernie Ball pedals
Synthesizers.com
Roger Arrick makes a variety of modules that are popularly called "dotcom". Roger provides very cost-effective modules with vintage style designs. Dotcom modules use 1/4" jacks and big knobs. Check out his web site - there is a LOT of great info there. One tantalizing thing is the Entry System Purchase Plan.
- Synthesizers.com
- FAQ Frequently Asked Questions
- WIKI
- Yahoo Group
- Module modifications by Morbius
Synth Modules
Home of the PSIM-1. Brice Hornback started building his own modular and then created the PSIM-1, the "Programmable Synthesizer Inteface Module", which is a Frac-rack format module that can be programmed to output a variety of control voltages. NOTE: Brice is WAY behind in deliveries (as of October 2006, I believe it's been two years and five months), but he assures us that all ordered modules will be delivered. Brice recently posted that there are only something like 9 out of 56 left to be shipped. In the meantime, a group of developers has gotten together and created a Yahoo group called ComputerVoltageSources.
- SynthModules
- SynthModules Yahoo group
- Dave Brown's PSIM programs
- Computer Voltage Sources Yahoo group
- Dave Brown's CVS project - updated PSIM. Nice!
Synth Panels
I run a small business making panels and selling cables and other parts. I purchased all of the silkscreens for the original "Stooge Panels" that Larry Hendry and Dave Bradley used to make, plus I have added many new designs.
Technosaurus
This Swiss company produces the "Small Monster" series including the Microcon monophonic synth, the Effexon analog processor and the Cyclodon 16 step sequencer, and the "Professional" series of analog modules.
- Technosaurus
- Big City Music US distributer
Tellun
Scott Juskiw has designed Blacet and MOTM add-ons (see Blacet and Synthesis Technology sections here) as well as several modules of his own, including the Neural Agonizer spring reverb and the Veeblefetzer signal level meter. Recently Scott developed a new multi-purpose board called the MUUB. As of December 2006, Scott tells me that he is thinking about resurrecting the TLN-854 Sword of Kahless next year! If you're interested in one, let him know.
Vermona
This German company makes several synthesizers and modules.
Wiard
Grant Richter builds the Wiard series of modules. His older, discontinued, 300 Series is highly collectible. Current 1200 Series modules are built by Grant himself. They are based on the "Frac-rack" system, require plus or minus 15v power and are calibrated 1v/octave. Connections are 1/8" mini-jacks. Currently available modules include a joystick, the Joystick Axis Generator, Noise Ring, and the Borg and Boogie Filters.
- Wiard
- Wiards sound demos (I particularly like the commercials myself...)
- WoggleBug
Do It Yourself
There are several things you'll need to put together your own analog synth modules. First, you should have a well-lit work area. For tools, you'll need a soldering iron, screwdrivers and nutdrivers. If you buy kits from Blacet, PAiA or Synth Tech, that may be all you need. If you run into assembly or part troubles, you'll need diagnostic tools such as a Digital Multi Meter (DMM) or an Oscilloscope. It may also be nice to have a small parts vise as a "third hand" along with a large magnifying glass.
Helpful sites
- Lady ADA web site (home of the x0xb0x other fun projects)
- Synthesis Technology tutorials
- Doepfer DIY page
Synthesis (SYNTH) (from the ancient Greek "with" and "placing") refers to a combination of two or more entities that together form something new; alternately, it refers to the creating of something by artificial means. The corresponding verb, to synthesize (or synthesise), means to make or form a synthesis.
Wizard (WYZRD) n 1. a person who practises or professes to practise magic or sorcery 2. a person who is outstandingly clever in some specified field; expert 3. a wise man 4. computing a computer program that guides a user through a complex task adj 5. informal chiefly superb; outstanding 6. of or relating to a wizard or wizardry [ variant of wissard, from wise 1 + -ard ] 'wizardly adj wizard c.1440, "philosopher, sage," from M.E. wys "wise" (see wise (adj.)) ard. zynyste "magic," zynys "sorcerer," zyne "witch," all from zinoti "to know." The ground sense is perhaps "to know the future." "wise magical power!"
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