Eurorack Synth Modules

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Eururack box-2022-11-28 P1080838-720px.jpg

Overview[edit]

ER-ADSR-555-01 - Eurorack ADSR Envelope Generator Module[edit]

ER-ADSR-555-01

ER-ADSR-555-01 SET P1080636-720px.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-CVPOTS4 - Eurorack Control Voltage Pots[edit]

ER-CVPOTS4

ER-PROTO-01-CV4 P1080697-720px.jpg

ER-CV-POTS-5 - Eurorack Control Voltage Pots[edit]

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[edit]

ER-MIDI-CV4-02

ER-MIDI-CV4-02 P1080867-720px.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[edit]

ER-MIDI-THRU

ER-MIDI-THRU SET P1080708-720px.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[edit]

ER-MIXER5-01 SET P1080819-720px.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

SYNTH-MIXER6-01 - Eurorack 6 Channel Mixer[edit]

  • 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-MOZZI-DB - Arduino NANO running MOZZI[edit]

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-PROTO-01 - Eurorack Prototype card (6 pots, 4 jacks)[edit]

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-02 - Eurorack Prototype card (6 pots, 6 jacks)[edit]

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-SH-NOISE - Sample/Hold and Noise Generator[edit]

ER-SH-NOISE

ER-SH-NOISE-01 SET-3D-720PX.png

  • Sample and Hold
  • Noise Generator
    • White, Pink, Blue noise

ER-VCA2-01 - 2 Channel Voltage Controlled Amplifier[edit]

ER-VCA2-01 P1080781-720px.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-01 - Voltage Controlled Filter[edit]

ER-VCF-01

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

ER-VCO-03 - Eurorack VCO using RP2040 CPU[edit]

  • 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

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

Eurorack DIY Panel[edit]

  • 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[edit]

DUAL LINEAR PS SCHEM.PNG

HAGIWO Builds[edit]

  • HAGIWO on Reddit
  • Mapping of Land Boards Synth cards to HAGIWO designs
    • Purpose is re-use of Land Boards card elements for HAGIWO designs
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[edit]

Projects[edit]

KiCad Libraries[edit]

Daughterboard Heights[edit]

Part Orientations[edit]

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

Front Panel Jacks[edit]

Eurorack Vertical Pots[edit]

Op Amps[edit]

  • 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[edit]

Erica Synths EDU DIY Sequencer Build Notes[edit]

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[edit]

Beaks, a throughhole PWM version of MI Peaks[edit]

Software[edit]

Hardware/Parts[edit]

Samples[edit]

Box Build[edit]

Eurorack Plywood Box 02 cropped-720px.jpg

Eurorack Box Build

Videos[edit]

  • Hooking together modules