Land Boards Synth Components
Contents
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
- 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
- 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
- 12*1.414 = ~17V
- L7812CV, +12V, 1.5A Regulator
- L7912CV, -12V, 1.5A Regulator
Reference Docs
- Doepfer Eurocard inventor/specs
- MIDI Communication
- Creative Control Strategies: MIDI to CV
- EuroPi
- Eurorack Beginners Guide
- Eurorack Wiki page
- KiCad Audio Jack Symbols
- MidiSoft
- A simplified guide to TRS MIDI
- How to Make Your Own 3.5mm mini stereo TRS-to-MIDI 5 pin DIN cables
- 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
- Deftaudio GitHub - KiCad footprints
- graybloomfield - Very nice Arduino based designs
Module Kits
- Erica Synths
- SyntherJack - DIY Synths
- BEFACO - Kits
- Kassutronics DIY Store
- Kassutronics DIY GitHub
- Music From Outer Space
- Thonk Shop - in UK
- synthrotek
Software
- adafruit_midi CircuitPython API
- MIDI Controller in Python
- MidiEditor
- Convert binary files to C data arrays (Arduino) - In Japanese
- Binary to C Array
- Arduino Mozzi Library
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
Videos
- Hooking together modules
