Eurorack Synth Modules

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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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