Land Boards Synth Components

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Eurorack Plywood Box 02 cropped-720px.jpg

Synth Modules (Standalone)

MIDI-IN-OUT

MIDI-IN-OUT REV1 FRONT 3D.png

  • MIDI-IN-OUT - MIDI In/Out
  • MIDI In/Out Jacks
  • 5V MIDI
  • 3.3V or 5V Serial connections
  • MIDI In is opto-isolated
  • (2) 4-40 Mounting holes

SCF-2

  • SCF-2 - Dual 3.5mm Audio Jacks (Scale, Clip, Filter)

SCF-2 REV 1 FRONT 3D.png

  • Digital Inputs or Outputs
  • (2) 3.5mm Jacks
  • Scaling resistors
  • Schottky Clamping Diodes
  • Filter cap
  • Ring pin brought to connector
    • Ring pin is not used in Synth applications
    • Card can be used as a 3.5mm breakout
  • (2) 4-40 mounting holes

SYNTH-VCO-01

SYNTH-VCO-01 REV1 FRONT 3D.png

  • Build of Pico VCO by HAGIWO
  • Digital Voltage Controlled Oscillator (VCO)
  • Three modes: Wavefold, FM and AM
  • PWM output with 2 pole low pass filter
  • Each mode has eight built-in waveforms
  • XIAO RP2040 CPU
  • (5) Pushbuttons
    • Octave Up/Down
    • Mode Up/Down (Wavefold, FM and AM)
    • Push Timbre switches between 8 waveforms
  • (2) Knobs
    • Freq fine adjust
    • Mod adjust
  • Standard EuroRack 16 pin header
    • Supports 12V in with on-board 5V regulator
    • 5V regulator can be not installed if 5V is available on EuroRack connection
  • Card is not a Eurorack card
    • Probably too deep, needs cabling
  • (4) 6-32 mounting holes

SYNTH-MIDI-CTL-01

SYNTH-MIDI CTL-01 REV1 FRONT 3D.png


  • Adapted from HAGIWO's MIDI to CV module
    • Translate from Japanese to English using browser
  • XAIO RP2040 CPU
    • Arduino MIDI library has not yet been ported to Pico so will need to use CircuitPython
  • MIDI In/Out
    • Standard MIDI Jacks
    • MIDI out jack for future functionality
  • (2) 0-5V Analog CV outs
  • (2) Digital Outs, eX:
    • Gate
    • Clock
  • Pot supports setting Clock rate
  • Standard EuroRack 16 pin header
    • Supports 12V in with on-board 5V regulator
    • 5V regulator can be not installed if 5V is available on EuroRack connection
  • Card is not a Eurorack card
    • Probably too deep, needs cabling
  • (6) 6-32 Mounting holes

SYNTH-MIDI-CV4-01

SYNTH-MIDI CV4-01 REV1 FRONT 3D.png

  • 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
  • XAIO RP2040 CPU
    • Arduino MIDI library has not yet been ported to Pico so will need to use CircuitPython
  • MIDI In
    • Standard MIDI Jacks
    • MIDI out jack for future functionality
  • (4) 0-5V Analog CV outs
  • Standard EuroRack 16 pin header
    • Supports 12V in with on-board 5V regulator
    • 5V regulator can be not installed if 5V is available on EuroRack connection
  • Card is not a Eurorack card
    • Probably too deep, needs cabling
  • (6) 6-32 Mounting holes

Eurorack Modules

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-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

SYNTH-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+"

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 +/- 12V Power Supply

DUAL LINEAR PS SCHEM.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

MOD Designs

  • Good for prototyping, but not Eurorack
  • Stackable via standoffs
  • 100mm wide
  • 47mm deep
  • 4-40 mounting holes

MOD-SCF-JACKS

MOD-CF-JACKS

MOD-SCF-JACKS FRONT 3D.png

MOD-CF-JACKS FILTER J5.PNG

MOD-CF-JACKS FILTER SCHEM.PNG

MOD-DIY

MOD-DIY

MOD-DIY FRONT 3D.png

  • DIY "breadboard"
  • Rear pins bs to top/bottom
  • Extra connections on edge
  • Busses marked on silkscreen
  • (2) Horizontal busses in center for power/ground

MOD-MIDI-THRU

MOD-MIDI-THRU

MOD-MIDI-THRU FRONT 3D.png

  • DIN-5 in
  • (4) TRS Type A outs

MOD-NANO-CPU

MOD-NANO-CPU

MOD-NANO-CPU FRONT-3D.png

  • Arduino NANO
  • Runs MOZZI Arduino library
    • MOZZI audio output
    • Standard or HiFi
  • MIDI In on TRS Type A
  • Remove J4 (EN_MIDI) when USB is plugged into NANO CPU

MOD-POTS

MOD-POTS

MOD-POTS FRONT 3D.png

  • 4 pots
    • Type A = "Audio" log pots
      • Used for Volume controls
    • Type B = Linear pots
      • Used for CV
  • All pins brought to connector
  • Headers to optionally pull pot ends up/down
  • Can be used as controls (end pulled up/down or volume controls (CW, CCW brought to pins)
  • Optional R/C filter

MOD-XIAO-RP2040-CPU

MOD-XIAO-RP2040-CPU

MOD-XIAO-RP2040-CPU FRONT-3D.png

  • XIAO RP2040 CPU
  • MIDI In on TRS Type A
  • (4) Analog Inputs or Digital GPIO
  • (7) Digital GPIO
  • SD Card on RP2040 SPI bus

Box Build

Eurorack Plywood Box 02 cropped-720px.jpg

Box Construction

  • 3/4" plywood
  • 84 HP
  • 18-3/8" Wide
  • 6-1/2" tall
  • 4-3/4" deep
  • Glued together/clamped
    • Need screws?
  • Did not use 1/4-20 screws, drilled small holes into back of rails and screwed rails down w/ wood screws
  • Rails are flush to box edges
  • Next one
    • Screw in rails before gluing up box

Box Hotel Services

  • Mean Well Power Supply
    • RT-85B
      • 88W Power Supply
      • 5V, 8A
      • +12V, 3.5A
      • -12V, 0.5A
  • 16 pin power distribution via perfboard (4 connectors with room for 2 more?

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

  • Certain pot models can be mounted to a card behind the Front Panel
"Thonk" TALL TRIMMER 9MM POTS

SongHui PartPic.PNG

SongHuei Ordering.PNG

SongHuei Marking.PNG

  • Shaft length of 25mm as measured from the "bottom" of the pot to the top of the shaft

SongHuei Mechs.PNG

SongHuei KQ Shaft.PNG

Synthrotek Long Shaft Pot with Pointer
  • Synthrotek store page
    • Looks the same as Song Huei parts sold by Thonk but Synthrotek does not provide details

Synthrotek 9mm Pots.PNG

  • These pots have the same footprint as Alpha/Synthrotek metal shaft pots, but with a longer shaft
  • They are knurled with a white pointer, so they don't need any knobs
  • They are suitable for many different Eurorack projects
    • .05W
    • 20% Tolerance
Alpha pots

RV09AF-40 ALPHA POT pic.png

RV09AF-40 ALPHA POT Mechs.png

RV09AF-40 ALPHA POT Ordering.PNG

Op Amps

  • From this site
    • The 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.

Module Kits

Software

Hardware/Parts

Samples

HAGIWO Builds

FUNCTION 3.5MM POTS TOGG PBS ROT DIN5 CPU LINK
MIDI-IN-OUT 0 0 0 0 0 2 NONE
SCF-2 2 0 0 0 0 0 NONE
SYNTH-MIDI-CTL-01 4 0 0 0 0 2 XAIO RP2040
SYNTH-MIDI-CV4-01 4 0 0 0 0 2 XAIO RP2040
SYNTH-MIXER6-01 7 7 0 0 0 0 NONE https://note.com/solder_state/n/nffc1a33053be
SYNTH-VCO-01 4 2 2 1 0 0 XAIO RP2040 https://note.com/solder_state/n/nca6a1dec3921
SYNTH-VCO-03 4 2 2 1 0 0 XAIO RP2040 https://note.com/solder_state/n/nca6a1dec3921
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

Videos

  • Hooking together modules

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