Eurorack Synth Modules

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Box 6U 104HP P1143-720px.jpg

Contents

Overview

ER-ADSR-555-01 - Eurorack ADSR Envelope Generator Module

Tindie-mediums.png

ER-ADSR-555-01

ER-ADSR-555-01 P1090094-720px.jpg

  • 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 - Eurorack Control Voltage Pots

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-CV4-02 - Eurorack 4X CV Module

Tindie-mediums.png

ER-MIDI-CV4-02

ER-MIDI-CV4-02 P1080867-Front Rear 720px.jpg

  • Eurorack 6HP, 3U module
  • Adapted from HAGIWO's MIDI to CV module
    • Translate from Japanese to English using browser
    • Removes Digital Outputs
    • Has 4 Analog Outputs instead of 2
  • Based also on SYNTH-MIDI-CV4-01
  • Arduino Pro Mini
    • 16 MHz
    • 5V
    • Could cable using external FTDI USB to Serial to get USB MIDI
  • MIDI In on TRS Type A jack
  • (4) 0-5V Analog CV outs
  • GATE output
  • CLK output
  • TRIG output
  • Standard EuroRack 16 pin header

ER-MIDI-THRU - Eurorack MIDI Thru

ER-MIDI-THRU

ER-MIDI-THRU SET CCA Front Back-002-720px.jpg

  • 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

Tindie-mediums.png

ER-MIXER5-01

ER-MIXER5-01 SET Front Rear-720px.jpg

  • 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

ER-MIXER5-02 - Eurorack 5 Channel Mixer

ER-MIXER5-02

ER-MIXER5-02 Front Rear-720px.jpg

  • Eurorack 6HP
  • Same as ER-MIXER5-01 but has 6 pots at top, jacks on bottom
  • 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

ER-MULTS-01

ER-MULTS-01

ER-MULTS-01 Front-Rear 720PX.jpg

ER-MULTS-02

ER-MULTS-02

ER-MULTS-02 Front Rear-720PX.jpg

ER-PWR-01

ER-PWR-01

ER-PWR-01 P1090214-720PX.jpg

ER-PROTO-01 - Eurorack Prototype card (6 pots, 4 jacks)

ER-PROTO-01

ER-PROTO-01 SET P1080665-720px.jpg

  • 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-PROTO-01 - Examples

Arduino NANO MOZZI

Arduino NANO MOZZI on ER-PROTO-01

ER-PROTO-01-NANO-MOZZI P1080687-720PX.jpg

ER-PROTO-01-NANO-MOZZI P1080693-720PX.jpg

CV4 - 4 Control Voltages

ER-CVPOTS4

ER-PROTO-01-CV4 P1090031-F B 720px.jpg

Noise Generator

Noise Generator on ER-PROTO-01

ER-PROTO-01 NOISE P1080751-720px.jpg

ER-PROTO-01 NOISE P1080755-720px.jpg

Slew Rate Controller

Slew Rate Controller on ER-PROTO-01

ER-PROTO-02 - Eurorack Prototype card (6 pots, 6 jacks)

ER-PROTO-02

ER-PROTO-02 SET P1080833-720pxV.jpg

  • 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
  • 0-6 Jacks
  • Tip/ring brought to header near 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-PROTO-02 - Examples

Cards built on the PROTO-02 card set

ER-BEZIER-CV

RANDO P1080937-720px.jpg

ER-CV-AMP3

ER-PROTO-02-CV AMP P1080931-720px.jpg

ER-DELAY-01

ER-DELAY-01 FRONT-BACK-720px.jpg

ER-DELAY-02

ER-GATE-SEQ-01

ER-GATE-SEQ-01 P1080960-720px.jpg

ER-LEDS

ER-LEDS P1080999-720px.jpg

ER-MOZZI-DB - Arduino NANO running MOZZI

ER-MOZZI-DB

ER-PROTO-02-MOZZI-DB P1080850-720PX.jpg

  • Daughtercard to ER-PROTO-02 card
    • Uses Front Panel and Controls card
      • Controls card populated as required
        • 0-6 Jacks, 0-6 Pots
  • Arduino NANO
  • High Def Sound output
  • Up to 6 Pots connected to A/D inputs
  • Up to 4 input jacks connected to A/D inputs
  • Options
    • 0-4 Pots, 0-4 Input Jacks
    • 5 Pots, 0-3 Input Jacks
    • 6 Pots, 0-2 Input Jacks

ER-MOZZI-DB-03 - Arduino NANO running MOZZI

ER-MOZZI-DB-03

ER-PROTO-02-SET MOZZI FRONT-3D V3.png

ER-MOZZI-DRUMS

ER-MOZZI-DRUMS P1090041-F B 720PX.jpg

ER-SCOPE-01

ER-SCOPE-01 Front-Rear-720px.jpg

ER-SH-02 - Dual Sample and Hold

ER-SH-02

ER-PROTO-02 S-H Front-Rear-720px.jpg

CV SHIFT on ER-PROTO-02

CV SHIFT on ER-PROTO-02

ER-STIX

ER-STIX - Mutable Instruments Branches "like"

ER-STIX Front-Rear 720PX.jpg

ER-USB-MIDI

ER-USB-MIDI - USB MIDI to TRS A

ER-USB-MIDI P1090014-720PX.jpg

ER-VCA2-01 - 2 Channel Voltage Controlled Amplifier

ER-VCA2-01

ER-VCA2-01 SET Front-Rear-720PX.jpg

  • 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-02 - Voltage Controlled Filter

ER-VCF-02

ER-VCF-02 Front-Back-720px.jpg

ER-VCO-03 - Eurorack VCO using RP2040 CPU

ER-VCO-03

ER-VCO-03 SET P1080788-720px.jpg

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

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

HAGIWO Builds

FUNCTION 3.5MM POTS TOGG PBS ROT DIN5 PROCESSING LINK
No. 59 CV Adder 12 0 0 0 0 0 NONE https://note.com/solder_state/n/nd040f097cbc2
No. 58 Bezier CV 2 4 0 0 0 0 NANO https://note.com/solder_state/n/n39aacefd73a3
No. 57 Strain CV https://note.com/solder_state/n/n79cdb2c458a9
No.56 Sample Drum 3 1 1 0 0 0 ESP32C3 https://note.com/solder_state/n/n950ed088c3cb
No.55 V2164 Dual VCA 6 6 0 0 0 0 NONE https://note.com/solder_state/n/nd82c027d0597
No.54 PT2399 clock sync delay 4 3 1 0 0 0 NANO https://note.com/solder_state/n/nf6dc0a61e26d
No.52 Reverse step sequencer 4 8 2 0 0 0 CDT7350 https://note.com/solder_state/n/n13c49f08ca1f
No.50 LFO/VCO rebuild 2 3 1 0 0 0 NANO/AD9833 https://note.com/solder_state/n/nd2c22a73e8fe
No.49 Clock Divider 11 0 0 0 0 0 TC4040BP https://note.com/solder_state/n/n7979cda44dcb
No. 47 Sample & hold 3 2 1 0 0 0 LF398 https://note.com/solder_state/n/n29b52f4f01f1
No.46 Dual Envelope generator 4 8 0 0 0 0 NANO https://note.com/solder_state/n/n6fb73eb1d8b8
No.45 Diode clip Distortion 2 3 0 0 0 0 NONE https://note.com/solder_state/n/n5f35e2e84a3e
No.44 Wave shaper & VCA 2 1 0 0 0 0 NONE https://note.com/solder_state/n/nfdc2e198255a
No.43 Envelope Follower 4 3 0 0 0 0 NONE https://note.com/solder_state/n/n110e9ba066b3
No.42 PCM drum 6 4 2 1 0 0 NSX-1/SAMD https://note.com/solder_state/n/neabe7e014c11
No.40 Voltage controlled switch 8 1 0 1 0 0 NJU211 https://note.com/solder_state/n/n98883e71f814
No.39 Diode ladder VCF 3 3 0 0 0 0 NONE https://note.com/solder_state/n/n598f23105ec4
No.38 Touch controller 5 1 1 4* 0 0 NANO/MPR121 https://note.com/solder_state/n/ncd42925f726b
No.37 Overflow folding VCO 4 3 0 1 0 0 XIAO https://note.com/solder_state/n/nf01e7c92b010
No.36 LM13700 Dual VCA 6 2 0 0 0 0 LM13700 https://note.com/solder_state/n/n3357199504d8
No.35 CV to MIDI 6 1 0 0 0 1 NANO/SSD1306 https://note.com/solder_state/n/nb618127f37c9
No.33 Dual Quantizer 7 1 0 0 1 0 SAMD/SSD1306 https://note.com/solder_state/n/nb8b9a2f212a2
No.32 Spin FV-1 multi FX 5 5 0 0 0 0 NANO/FV-1 https://note.com/solder_state/n/n1c402a78a0fe
No.31 Ring modulator & wavefold 4 3 0 0 0 0 AD633 https://note.com/solder_state/n/n9d138d74b39d
No.30 Euclidean rhythm sequencer 7 0 0 1 1 0 NANO/SSD1306 https://note.com/solder_state/n/n433b32ea6dbc
No.29 SH-101 type sequencer 7 1 TRIM 0 1 1 0 SAMD/SSD1306 https://note.com/solder_state/n/n80f4baf81226
No.28 DSP multi effector 2 0 0 0 0 0 DSP https://note.com/solder_state/n/nd9c984a9ab7a
No.27 5ch mixer 6 6 0 0 0 0 NONE https://note.com/solder_state/n/nffc1a33053be
No.26 V2044 VCF 3 3 0 0 0 0 V2044 VCF https://note.com/solder_state/n/n0fabdc23fe1e
No.25 Oscillo scope & Spectrum analyzer 3 1 1 0 1 0 NANO/SSD1306 https://note.com/solder_state/n/n6b4cc8d1c6b9
No.24 V2164 Dual VCA 6 2 0 0 0 0 V2164 https://note.com/solder_state/n/n14a8be5f7118
No.23 CHORD VCO 4 3 0 0 0 0 NANO https://note.com/solder_state/n/n681d2e07e324
No.22 Additive VCO 4 3 0 0 0 0 NANO https://note.com/solder_state/n/n30b3a8737b1e
No.20 CV/GATE 8step sequencer 3 8 1 0 0 0 CD4022BE /NE555 https://note.com/solder_state/n/n4da93d157f26
No.19 FM VCO 4 3 0 0 0 0 NANO https://note.com/solder_state/n/n88317851a4c7
No.18 2OSC VCO 3 3 1 0 0 0 NANO https://note.com/solder_state/n/n71c67b5aaeca
No.17 Multi mode Envelope generator 2 4 1 0 0 0 NANO https://note.com/solder_state/n/n69643b792274
No.16 CV/Gate sequencer & Arpeggiator 5 0 0 1 1 0 NANO/SSD1306 https://note.com/solder_state/n/n7c2809976698
No.15 TR-808/909 sample player drum 5 0 0 1 0 0 SAMD/SSD1306 https://note.com/solder_state/n/n0209d16d0d08
No.14 KICK 3 4 0 0 0 0 NANO https://note.com/solder_state/n/ne33e32660d50
No.13 Noise & Hi-hat 4 3 0 0 0 0 NANO https://note.com/solder_state/n/nf65437f12790
No.12 Clock SYNC LFO 2 4 0 0 0 0 NANO https://note.com/solder_state/n/n4c600f2431c3
No.11 MIDI to CV 4 1 0 0 0 1 NANO https://note.com/solder_state/n/n17e028497eba
No.10 Gate Burst/Delay 4 2 1 1 0 0 NANO https://note.com/solder_state/n/n28b5c43229af
No.9 6ch trigger sequencer 7 0 0 1 1 0 NANO/SSD1306 https://note.com/solder_state/n/n17c69afd484d
No.8 SX150 VCF 3 2 1 0 0 0 NANO/MCP4726 https://note.com/solder_state/n/n5136d98930a8
No.7 Quantizer 4 2 1 0 1 0 NANO/MCP4726 https://note.com/solder_state/n/nde97a0516f03
No.6 Clock multi divide 4 2 1 0 0 0 NANO https://note.com/solder_state/n/n8907f2f6e8f5
No.5 Generative sequencer 3 2 1 0 0 0 NANO/MCP4911 https://note.com/solder_state/n/n8a489f0b857a
No.4 samplar 3 1 1 0 1 0 NANO/TF PLAYER https://note.com/solder_state/n/n6057a5256042

Eurorack Reference Docs

Projects

KiCad Libraries

Daughterboard Heights

Part Orientations

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

Erica Synths EDU DIY Sequencer Build Notes

Edu DIY SEQ.720PXv.jpg

  • EDU DIY Sequencer
  • Assembly drawing unreadable line weights when printed out
    • Needed to zoom way in on PC to PDF
  • Ref des of parts not in any particular order
    • A break-out drawing pointing to Find Numbers would help a lot
  • No real PL
    • What is called a PL does not list ref des
  • BC548 in design. BC547 was shipped
    • BC547 is a better spec part (same function, higher voltage version)
  • Transistors pad sizes way too small
  • Resistor holes are very big compared to 1/4W lead diameters
  • Getting to the legs of the LEDs was challenging
    • Soldering was not trivial but was the least of the challenges
    • Trimming the legs near the transistor was scary
    • Could not cut one low due to nearby parts
  • Toggle switch has very large holes that make alignment of the switches very difficult
  • Clock In voltage needs to meet CD4000 expected level ~70% of Vcc or about 8V
    • My 5V clock didn't work
      • Replacing the clock unity gain with a comparator might be a good choice, but would create a 12V clock out from a 5V in clock
  • Trimmer 2K was 2K5
  • Unable to get trim all the way to 5V or 2.5V
    • Video has same issue but just w/ 5V
    • Probably not a big issue and might just be "safer"
    • Got closer to the 2.5V position
  • Switches don't turn off the CV, they just shut off the gate
    • Need an Envelope Generator to test
  • Holes to mount in rack are round - slotted would be better possibly
  • All in all, good value for the money

Braids Throughhole version of the Mutable Instruments Braids

Beaks, a throughhole PWM version of MI Peaks

Software

Hardware/Parts

Samples

Box Build

Box Version 2

Eurorack Box Build V2

Box 6U 104HP P1143-720px.jpg

  • 104 HP
  • Two 3U rows
  • 1/2" Cherry
  • Spar varnish finish

Box Version 1

Eurorack Box Build

Eurorack Plywood Box 02 cropped-720px.jpg

  • 3/4" Red Oak plywood
  • Spar varnish finish (no finished in photo)
  • 84HP
  • Single 3U

Videos

  • Hooking together modules

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