Difference between revisions of "Eurorack Synth Modules"

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== Eurorack Reference Docs ==
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 +
* [https://doepfer.de/home_e.htm Doepfer Eurocard inventor/specs]
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** [https://doepfer.de/a100_man/a100t_e.htm Principles of Voltage Control]
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* [https://www.tigoe.com/pcomp/code/communication/midi/ MIDI Communication]
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* [https://www.perfectcircuit.com/signal/midi-to-cv Creative Control Strategies: MIDI to CV]
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* [https://www.behance.net/gallery/113377671/EuroPi-Making-EuroRack-Affordable EuroPi]
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* [https://reverb.com/news/beginners-guide-to-eurorack-case-basics-oscillators-filters Eurorack Beginners Guide]
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* [https://en.wikipedia.org/wiki/Eurorack Eurorack Wiki page]
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* [https://github.com/clacktronics/AudioJacks KiCad Audio Jack Symbols]
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* [https://www.midisoft.de/ MidiSoft]
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** [https://www.midisoft.de/EuroRackDimensions/EuroRack_Dimensions.html EuroRack Dimensions]
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** [https://www.midisoft.de/EuroRackDimensions/holes.jpg Panel Holes]
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* [https://minimidi.world/#how-trs-midi-works A simplified guide to TRS MIDI]
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* [https://www.midi.org/midi-articles/updated-how-to-make-your-own-3-5mm-mini-stereo-trs-to-midi-5-pin-din-cables How to Make Your Own 3.5mm mini stereo TRS-to-MIDI 5 pin DIN cables]
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* [https://division-6.com/learn/eurorack-power/ Eurorack Power Connectors]
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* [https://www.midi.org/specifications-old/item/midi-din-electrical-specification MIDI Electrical spec]
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* [https://www.facebook.com/groups/403937676290574/ Eurorack Facebook group]
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=== Projects ===
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* [https://github.com/elkayem/midi2cv elkayem midi2cv GitHub page] - Nano based project
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** Arduino MIDI library has '''not''' yet been ported to Pico so will need to use Python
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** Drives 4 CV outputs: Pitch Blend, Control, Note, Velocity
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** This card only drives Note (Voltes/Oct, Mod)
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* [https://github.com/benevpi/PicoPicoSynth PicoPicoSynth]
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* [https://github.com/Deftaudio/Midi-boards Deftaudio GitHub] - KiCad footprints
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* [https://github.com/TomWhitwell/TuringMachine Turing Machine]
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* [https://github.com/gavD/arduino-drum-machine DIY Hackable Arduino Drum Machine]
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** [https://www.youtube.com/watch?v=4u4Px2gMwGw vIDEO]
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* [https://www.notesandvolts.com/2014/07/build-auduino-granular-synth-part-1.html Build the Auduino Granular Synth]
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* [https://benjiaomodular.com/ Benjie's Synth DIY notes] - Nice docs
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* [https://www.reddit.com/r/synthdiy/ REDDIT Synth DIY]
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* [https://github.com/tkilla64/eurorack tkilla64] Nice collection of Eurorack module designs - mostly Gerbers
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* [https://github.com/ScottBillingsley/Philosophy-of-Noise Scott Billingsley Philosophy of Noise] - GitHub Repo
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* [https://github.com/hires/Dintree Andrew Kilpatrick DINTREE GitHub]
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=== KiCad Libraries ===
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* [https://github.com/benjiaomodular/KiCadLibraries Ben Jiao Modular KiCad Libraries]
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* [http://graybloomfield.com/guitar/synth/ graybloomfield] - Very nice Arduino based designs
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=== Other Notes ===
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==== Daughterboard Heights ====
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* From notes on [https://www.youtube.com/watch?v=HMDGYm91Q1Y How to Make Great Looking Modular Front Panels - Part 3 Module Circuit Board Layout]
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** The absolute maximum of other boards I've seen is 111,5 mm and the TipTop Happy Ending Kit offers a space of 112,5 mm
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* 114.8mm measured between 3U Synthrotek rails
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** 128.5mm - 114.8mm = 13.7mm both sides, 6.875mm per side
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** 111.5mm daughtercard, leaves 8.5mm clearances top/bottom
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==== Part Orientations ====
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* For pots with built-in pointers, pot pins go down for pointer to go up at center point
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==== Front Panel Jacks ====
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* [[Eurorack Panel Jacks]]
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==== Eurorack Vertical Pots ====
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* [[Eurorack Pots]]
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==== Op Amps ====
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* From [https://www.apogeeweb.net/circuitry/TL084-op-amp.html#tl084-vs-tl074 this site]
 +
** The TL084 Op-Amp is very similar to TL074 but has high noise immunity and better offset characteristics.
 +
** The TL074 has lower noise figure, so is better for AC signals.
 +
** The TL084 has lower offset, so is better for DC signals.
 +
** The TL084 has better DC performance (low offset) and the TL074 has better noise/distortion performance.
 +
** '''You can use TL074s on the audio paths, TL084s on the control paths.'''
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** [https://www.ti.com/lit/ds/symlink/tl071h.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1666712437480&ref_url=https%253A%252F%252Fwww.mouser.com%252F TL074 Datasheet]
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** [https://www.ti.com/lit/ds/symlink/tl082m.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1666740012859&ref_url=https%253A%252F%252Fwww.mouser.ca%252F TL084 Datasheet]
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* The TL074 is $0.75 in qty 10 ([https://www.mouser.com/ProductDetail/Texas-Instruments/TL074CN?qs=AMJt07B76uv7dLYnj7iLiQ%3D%3D on Mouser])
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* The TL084 is $0.55 in qty 10 ([https://www.mouser.com/ProductDetail/Texas-Instruments/TL084CN?qs=q2XTDbzbm6ANF36GVAxPiQ%3D%3D on Mouser])
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* The TL072 and TL082 are both about the same price as each other, but are more expensive than the quad parts
 +
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=== Module Kits ===
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* [https://www.ericasynths.lv/ Erica Synths]
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** [https://github.com/erica-synths/diy-eurorack Erica Synths DIY GitHub]
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* [https://syntherjack.net/category/project/ SyntherJack] - DIY Synths
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* [https://www.befaco.org/# BEFACO] - Kits
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* [https://store.kassutronics.net/eurorack-diy-c-1/ Kassutronics] DIY Store
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** [https://github.com/kassu/kassutronics Kassutronics] DIY GitHub
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* [http://musicfromouterspace.com/index.php?MAINTAB=HOME&VPW=1024&VPH=500 Music From Outer Space]
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* [https://www.thonk.co.uk/shop/ Thonk Shop] - in UK
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* [https://www.synthrotek.com/ synthrotek]
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* [https://github.com/TomWhitwell/TuringMachine TuringMachine Mark 2]
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=== Software ===
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* [https://docs.circuitpython.org/projects/midi/en/latest/api.html adafruit_midi CircuitPython API]
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** [https://github.com/adafruit/Adafruit_CircuitPython_MIDI/tree/main/examples Example code]
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* [https://learn.adafruit.com/raspberry-pi-pico-led-arcade-button-midi-controller-fighter/coding-the-raspberry-pi-pico-midi-controller MIDI Controller in Python]
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* [https://learn.adafruit.com/qt-py-rp2040-usb-to-serial-midi-friends/coding-the-qt-py-rp2040-usb-to-serial-midi-friends USB to Serial MIDI]
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* [http://www.midieditor.org/ MidiEditor]
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* [https://hello-world.blog.ss-blog.jp/2016-10-16 Convert binary files to C data arrays (Arduino)] - In Japanese
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* [https://github.com/AntumDeluge/bin2header Binary to C Array]
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* [https://sensorium.github.io/Mozzi/ Arduino Mozzi Library]
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* [https://github.com/marcel-licence/esp32_basic_synth esp32_basic_synth]
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* [https://github.com/marcel-licence/esp32_usb_midi esp32_usb_midi]
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* [https://github.com/FortySevenEffects/arduino_midi_library arduino_midi_library]
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* [https://github.com/rppicomidi/midi2usbhost Pico MIDI Host to MIDI UART Adapter]
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=== Hardware/Parts ===
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* [https://store.synthrotek.com/ Synthrotek Store]
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* [https://www.thonk.co.uk/shop/thonkiconn/ THONKICONN – 3.5MM JACK SOCKETS]
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* Potentiometers are usually marked with an "A" for logarithmic taper or a "B" for linear taper;
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* [https://www.mouser.com/c/passive-components/potentiometers-trimmers-rheostats/potentiometers/?q=RV09AF&orientation=Vertical RV09AF vertical mount is Alpha pot] part number
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* [https://www.tubesandmore.com/products/potentiometer-song-huei-linear-9mm-tall 9mm Pots]
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* [https://www.taydaelectronics.com/hardware/3-5mm-plugs-jacks.html Tayda 3.5mm Jacks and stuff]
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=== Samples ===
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* [https://samplefocus.com/tag/drums Drum Samples]

Revision as of 15:20, 26 October 2022

Overview

ER-ADSR-555-01 - Eurorack ADSR Module

ER-ADSR-555-01

ER-ADSR-555-01 Set.png

  • Attack-Delay-Sustain-Release Eurorack ADSR Module
  • 555 Based design
  • Benjie Jiao MiniADSR
    • Original was based on Barry Klein design
    • As built by schmitzbits design - "The Fastest Envelope in the West"
    • A, D, and R Pots should be log pots
  • Pot silkscreen should show DECAY not DELAY

ER-CV-POTS-5

SYNTH-CV-POTS-5 REWORK ANNOTATED rear.png

  • Provides 5 Control Voltage Pots for manual control and testing of CV inputs
  • Use SYNTH-MIXER6-01 card with rework
    • Do not install Opamp
    • Do not install any passives
    • Clip J2-J7 tip switch pins (edge of card) - verify grounds removed
    • Hacksaw off top of card - J1-J2, RV1-RV2
    • Cut etches from J3-J6 (tip) to RV3-RV6 (bottom pin)
    • Add wires J3-J7 (tips) to RV3-RV7 (center pins)
    • Add wire U1-7 to U1-2
    • Fill holes J8 pins 1,2
    • Install 2x4 header in J8 (pins 3-10)
    • P-Touch labels
      • Label over top 2 holes "CV-POTS-5"
      • Relabel next 5 holes as CV1-CV5
        • Blank label over bottom 2 holes
      • Label end of J8 "CV+"
  • Re-build as 4 channels on ER-PROTO-01
    • Buffer outputs with Op Amps
  • Could power from either 5V or +/-12V

ER-MIDI-CV4-01 - Eurorack 4X CV Module

ER-MIDI-CV4-01

ER-MIDI-CV4-01 SET 3D-720px.png

ER-MIDI-THRU - Eurorack MIDI Thru

ER-MIDI-THRU

ER-MIDI-THRU SET-3D-720pxV.png

  • MIDI In on DIN-5 or 3.5mm TRS Type A
  • 4 Channel MIDI outputs on 3.5mm TRS Type A
  • Activity LED
  • 6 HP wide (30mm)
  • 3U tall
  • Eurorack power jack
    • Uses 5V

ER-MIXER5-01 - Eurorack 5 Channel Mixer

  • ER-MIXER5-01
  • Eurorack 6HP
  • Adapted from HAGIWO's 5 Channel Mixer Module
  • Separate individual input pots and output pot
  • Use A taper pots to mix audio signals
  • Use B taper pots to mix control voltage signals
  • Views: Front Panel, Front (controls), Parts side

SYNTH-MIXER5-01 SET FRONT 3D-720pxV.png

SYNTH-MIXER6-01 - Eurorack 6 Channel Mixer

  • SYNTH-MIXER6-01
  • Eurorack 6HP
  • Adapted from HAGIWO's 5 Channel Mixer Module
  • Rear card is too tall to fit in rack between rail
  • Hacksaw off top of card - remove J1, J2, RV1, RV2 to make 4 in mixer
    • Too tight at the bottom, need to hack off J2, RV2
  • Move up holes when mounting card to panel
  • Views: Front (controls), Parts side, Front Panel

SYNTH-MIXER6-01 SET FRONT 3D.png

ER-PROTO-01

ER-PROTO-01

ER-PROTO-PANEL-01-SET FRONT REAR-3D-720px.png

  • Eurorack Prototyping card set
  • 6 HP wide (30mm) front panel
  • 3U tall
  • 0-6 POTS
    • Series resistors on pot wiper
    • All 3 pot pins brought to top header
  • 0-4 Jacks
  • Tip/sleeve brought to header near middle/bottom
  • Pots on top, jacks on bottom
    • Easier to adjust pots without bumping into pots
    • Pots more often accessed than jacks
  • Large prototyping area
  • +12V, -12V down board edges
  • 5V/GND down center of card
  • Bussed connections horizontally
  • Front Panel with generic labels
    • Cover with White on Black P-Touch labels

ER-VCA2-01 - 2 Channel Voltage Controlled Amplifier

ER-VCA2-01-CTRLS REV1 SET-3d-720PX.png

  • Dual VCA
  • Adjust between VCA and Mod
  • 3U tall
  • 6HP wide
  • 3 card set
  • LM13700 based
  • Eurorack
  • +/- 12V Power, 10-pin power connector

ER-VCF-01 - Voltage Controlled Filter

ER-VCF-01

ER-ER-VCF-01-SET-3D-720PX.png

ER-VCO-03 - Eurorack RP2040 VCO

  • ER-VCO-03
  • Eurorack 6HP
  • (3) Card set
  • Views: Control Panel rear side, Control Panel controls side, Logic card component side, Logic card rear side, Front Panel

SYNTH-VCO CTL-01-CARD SET-3D.png

Eurorack DIY Panel

  • Front/Back View
  • Left = top

EUROPANEL-6HP rev1 front rear-3d.png

  • Based on HAGIWO design

  • 6HP wide
  • 3U tall
  • Power and Ground bus on either side of the card
  • Reduces wiring
  • Slotted mounting holes
  • 5mm Grid on rear side makes it easier to locate connectors for drilling

Eurorack +/- 12V Power Supply

DUAL LINEAR PS SCHEM.PNG

Eurorack Reference Docs

Projects

KiCad Libraries

Other Notes

Daughterboard Heights

Part Orientations

  • For pots with built-in pointers, pot pins go down for pointer to go up at center point

Front Panel Jacks

Eurorack Vertical Pots

Op Amps

  • From this site
    • The TL084 Op-Amp is very similar to TL074 but has high noise immunity and better offset characteristics.
    • The TL074 has lower noise figure, so is better for AC signals.
    • The TL084 has lower offset, so is better for DC signals.
    • The TL084 has better DC performance (low offset) and the TL074 has better noise/distortion performance.
    • You can use TL074s on the audio paths, TL084s on the control paths.
    • TL074 Datasheet
    • TL084 Datasheet
  • The TL074 is $0.75 in qty 10 (on Mouser)
  • The TL084 is $0.55 in qty 10 (on Mouser)
  • The TL072 and TL082 are both about the same price as each other, but are more expensive than the quad parts

Module Kits

Software

Hardware/Parts

Samples

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