Land Boards Synth Components

Synth Modules

• Synthesizer interfaces and modules
  • MIDI-IN-OUT - MIDI In/Out
  • SCF-2 - Dual 3.5mm Audio Jacks (Scale, Clip, Filter_
  • SYNTH-VCO-01 - Synth Voltage Controlled Oscillator
  • SYNTH-MIDI-CTL-01 - Synth MIDI Controller
  • SYNTH-MIDI-CV4-01 - 4 Output MIDI to CV controller

MIDI-IN-OUT

• 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)

• 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 - Synth Voltage Controlled Oscillator

• 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
  • Stacks with SYNTH-MIDI-CTL-01 card

SYNTH-MIDI-CTL-01

• SYNTH-MIDI-CTL-01 - Synth MIDI Controller

• 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
  • MCP4822 12-bit D/A - SPI Interface
    • MCP4822 Datasheet
  • Use with SYNTH-VCO-01
    • CV1 = V/OCT
    • CV2 = MOD
• (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
  • Stacks with SYNTH-VCO-01 card

SYNTH-MIDI-CV4-01

• SYNTH-MIDI-CV4-01 - 4 Output MIDI to CV controller

• 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
  • MCP4822 12-bit D/A - SPI Interface
    • MCP4822 Datasheet
  • Use with SYNTH-VCO-01
    • CV_1 = V/OCT
    • CV_2 = MOD
• 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
  • Stacks with SYNTH-VCO-01 card

6 Channel Mixer

• SYNTH-MIXER6-01
• Eurorack 6HP
• Adapted from HAGIWO's 5 Channel Mixer Module
• Views: Front (controls), Parts side, Front Panel

RP2040 VCO

• SYNTH-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

Eurorack +/- 12V Power Supply

• 115VAC in, 24V CT, 24 VA Transformer
  • 12*1.414 = 17V
    • Leaves 5V for regulator headroom and ripple
• [https://www.mouser.com/ProductDetail/511-L7812CV +12V, 1.5A Regulator
• -12V, 1.5A Regulator

Reference Docs

• Doepfer Eurocard inventor/specs
  • Principles of Voltage Control
• MIDI Communication
• Creative Control Strategies: MIDI to CV
• EuroPi
• Eurorack Beginners Guide
• Eurorack Wiki page
• KiCad Audio Jack Symbols
• MidiSoft
  • EuroRack Dimensions
  • Panel Holes
• A simplified guide to TRS MIDI
• Eurorack Power Connectors

Projects

• elkayem midi2cv GitHub page - Nano based project
  • Arduino MIDI library has not yet been ported to Pico so will need to use Python
  • Drives 4 CV outputs: Pitch Blend, Control, Note, Velocity
  • This card only drives Note (Voltes/Oct, Mod)
• PicoPicoSynth

Module Kits

• Erica Synths
  • Erica Synths DIY GitHub
• SyntherJack - DIY Synths
• BEFACO - Kits
• Kassutronics DIY Store
  • Kassutronics DIY GitHub
• Music From Outer Space
• Thonk Shop - in UK

Software

• adafruit_midi CircuitPython API
• MIDI Controller in Python
• MidiEditor
• Convert binary files to C data arrays (Arduino) - In Japanese

Hardware/Parts

• Synthrotek Store
• THONKICONN – 3.5MM JACK SOCKETS
• Potentiometers are usually marked with an "A" for logarithmic taper or a "B" for linear taper;

Samples

• Drum Samples

Videos

• Hooking together modules