Table of contents Intro Controller Eurorack Case Accessories Power SP1 Parts For Testing Breadboard Prototyping Oscilloscope Erica Synths EDU DIY Labor mki x es.EDU System EDU DIY Effects EDU DIY Drums Bleep Sound Basic ADSR Basic DC mixer Free Modular Boost MH Eurorack Bypass TRS UMIX Intro I am a fan of Look Mum No Computer , in one of his videos he mentions about the website Music From Outer Space and the book Make: Analog Synthesizers which has made me follow the deep (and expensive) rabbit hole of Analog Modular Synthesys.
Controller
I wanted something that I could connect up to a computer via USB to use software synths like VCVRack or for connecting up to Garageband and maybe later Logic Pro . I also wanted something that is able to control hardware synths with Pitch CV, Velocity CV and Gate control or via MIDI inputs and outputs. The Keystep Pro provides all 3, via USB, MIDI and mono 3.5mm output jacks.
Item Quantity Received Notes KeyStep Pro 1 1 The Special Black Edition I purchased also came with 14 CV/Gate cables for connecting to the eurorack modules
Eurorack Case I plan on 3D Printing a case to house an Oscilloscope Module , EDU DIY Drums and any extra modules I make using from PCBs or Prototype Kits .
Accessories Sourcing Parts Item Quantity Received Notes Befaco Bananuts (Black) 25 25 Available from Befaco Befaco Bananuts (Red) 25 25 Available from Befaco Befaco Bananuts Wrench Tool 1 1 Available from Befaco Befaco Knurlies 100 100 Available from Befaco Befaco Squid Cable 1 1 Available from Befaco Eurorack Blank Panels (Circuit Design) Set of 7 Set of 7 Available from Modular Synth Lab Eurorack Blank Panels (Erica Synths Blank) 2 x 8HP 2 Eurorack Blank Panels (MH Eurorack Logo) 2 x 4HP 1 Came free with MH Eurorack Kits Eurorack Blank Panels (Thonk Logo) 1 x 2HP 1
Power Sourcing Parts SP1 I have seen a 3D Printed Eurorack case that I would like to make called The SP1 by Spillerphoto.com on Printables
Sourcing Parts Item Quantity Received Notes M3 Nylon Screws 40 42 Nylon can prevent Rack Rash M3 Threaded Strip Insert 84HP 4 (6 including dust cover) 6 Available from Modular Synth Lab
Printing Parts Case Dust Cover Parts For Testing Breadboard To test eurorack modules, I initally built them up on a breadboard, powered by 2 9V Batteries. However, I have recently purchased the Erica Synths EDU DIY Labor Full Kit that I will use to power and test the modules going forward.
Videos © 2021 Moritz Klein
Sourcing Parts Item Quantity Received Notes Battery (9V) 2 2 Battery Connector (9V) 2 6 Breadboard 1 1 Digital Multimeter 1 1 Solid Core Wire Jumper Kit 1 2
Prototyping N8Synth PCB Capacitors Item Quantity Received Notes Electrolytic Capacitor (47uF) 10 10
Misc Siam Modular PCB Item Quantity Received Notes 14hp Eurorack Prototype board 3 3 Available on Siam Modular
Capacitors Item Quantity Received Notes Electrolytic Capacitor (10uF) 9 9
Misc Item Quantity Received Notes 16 Pin Power Header 3 3 16-16 pin Power Cable 3 3 30cm length DWB1 SPDT ON-ON Mini Toggle Switch 1 1 DWB2 SPDT ON-OFF-ON Mini Toggle Switch 1 1 DWB3 DPDT ON-ON Mini Toggle Switch 1 1 DWB4 DPDT ON-OFF-ON Mini Toggle Switch 1 1
Many of the parts sourced are used in the Erica Synths EDU DIY series. Quantity is extra quantities I have purchased to attempt to build additional modules.
PCB Item Quantity Received Notes Datanoise Pico ADK 1 1
Capacitors Item Quantity Received Notes Ceramic Capacitor (100nF) 100 100 Ceramic Capacitor (10nF) 100 100 on order Electrolytic Capacitor (4.7uF) 4 4 Electrolytic Capacitor (1uF) 4 4 Film Capacitor (1uF) 10 10 Film Capacitor (2.2nF) 20 20 Film Capacitor (1nF) 20 20
Diodes Integrated Circuits Item Quantity Received Notes 8 Pin DIP Sockets 15 15 14 Pin DIP Sockets 10 10 Op Amp Dual (TL072) 10 10 Op Amp Quad (TL074) 10 10 Hex Schmitt-Trigger Inverter (CD40106) 10 10 Timer (LM555) 10 10 Transistor N-CH JFET (J113) 10 10 Transistor NPN (BC548) 100 100 Transistor PNP (BC558) 100 100
Potentiometers Item Quantity Received Notes Aluminum Knob for Alpha Potentiometer 19 19 PCB Mount Trim Potentiometer (100K) 10 10 PCB Mount Trim Potentiometer (50K) 10 10 PCB Mount Trim Potentiometer (20K) 10 10 PCB Mount Trim Potentiometer (1K) 10 10 Vertical Alpha Potentiometer (B100K) 20 20 Vertical Alpha Potentiometer (B250K) 5 5 Vertical Alpha Potentiometer (B1M) 2 2 Vertical Trim Potentiometer (A1M) 4 4 Vertical Trim Potentiometer (A100K) 2 2 Vertical Trim Potentiometer (B100K) 8 8
Resistors Item Quantity Received Notes Metal Film resistor (1M) 100 100 Metal Film resistor (100K) 100 100 Metal Film resistor (82K) 100 100 Metal Film resistor (68K) 100 100 Metal Film resistor (47K) 100 100 Metal Film resistor (33K) 100 100 Metal Film resistor (27K) 100 100 Metal Film resistor (22K) 100 100 on order Metal Film resistor (20K) 100 100 Metal Film resistor (14K) 100 Can use 47K + 20k in parallel instead Metal Film resistor (10K) 100 100 Metal Film resistor (4.7K) 100 100 on order Metal Film resistor (2K) 100 100 Metal Film resistor (1.5K) 100 100 Metal Film resistor (1K) 100 100 Metal Film resistor (470R) 100 100 Metal Film resistor (100R) 100 100 Metal Film resistor (10R) 100 100
Misc Item Quantity Received Notes 5mm Red Square LED 1 1 10 Pin Power Header 8 8 16 Pin Power Header 2 2 16-16 pin Power Cable 2 2 30cm length 10K thermistor 20 20 DW3 DPDT ON-ON Sub-mini Toggle Switch 1 1 For use with Labor Modular Interface DW4 DPDT ON-OFF-ON Sub-mini Toggle Switch 1 1 For use with Labor Modular Interface Mono Audio Jack 29 29
Oscilloscope I also plan on building a cheap DIY Oscilloscope kit into a 3D printed Eurorack Module . I did not want to spend a lot of money on a decent oscilloscope, I just need one "good enough" to help with visualising waveforms and to get an idea of what output a module is producing.
Sourcing Parts Item Quantity DIY 2.4" inch LCD Digital Oscilloscope 1 MT3608 DC-DC Boost Converter 1
Printing Parts Erica Synths
Introducing Sooty and Susie to the Erica Synths mascot "Tuna The Cat"
EDU DIY Labor
Video © 2024 Moritz Klein
Basic Kit Basic Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDULAB Main PCB 1 EDUPRTP Utility Section Panel 1 EDUPNLF Expansion Slot Panel 1 EDUPNLB Breadboard Panel 1 EDUPNLM Modular I/O Panel 1 EDUPOT Potentiometer/Socket adapter PCB 24 EDUSW Switch/Button adapter PCB 16
Connectors Item Quantity 16-pin female header 8 4-pin female header 36 8-pin female header 3 40-pin male connector 4 830 Point Breadboard 1
Fasteners Item Quantity 3x11mm Spacer (female/female) 6 3x11mm Spacer (female/male) 2 3x23mm Spacer (female/male) 2 3x23mm Spacer (female/female) 6 M3X6 Phillips Screw (Black) 28
Potentiometers Item Quantity Vertical Trim Potentiometer (B1M) 2 Vertical Trim Potentiometer (B250K) 1 Vertical Trim Potentiometer (B100K) 5 Vertical Trim Potentiometer (B50K) 1 Vertical Trim Potentiometer (B10K) 2 Vertical Trim Potentiometer (B5K) 1 Vertical Trim Potentiometer (B1K) 1
Misc Item Quantity Mono Audio Jack 5 DW1 SPDT ON-ON Sub-mini Toggle Switch 1 DW2 SPDT ON-OFF-ON Sub-mini Toggle Switch 1 3mm Red LED 2 Plywood base 1 Breadboarding cable set 1 12V 1A wall wart 1
Full Kit Full Kit also contains the Quantity of additional parts.
Capacitors Item Quantity Ceramic Capacitor (1uF) 2 Ceramic Capacitor (470nF) 1 Ceramic Capacitor (100nF) 5 Ceramic Capacitor (10nF) 2 Ceramic Capacitor (2.2nF) 2 Ceramic Capacitor (1nF) 5
Diodes Item Quantity Signal Diode (1N4148) 10
Integrated Circuits Item Quantity Op Amp Dual (TL072) 2 Op Amp Quad (TL074) 2 Hex Schmitt-Trigger Inverter (CD40106) 2 Decade Counter (CD4017) 2 Shift Register Dual (4015) 2 Transistor NPN (BC548) 10 Transistor PNP (BC558) 10
Resistors Item Quantity Metal Film resistor (1M) 5 Metal Film resistor (470K) 2 Metal Film resistor (100K) 10 Metal Film resistor (82K) 2 Metal Film resistor (68K) 5 Metal Film resistor (47K) 5 Metal Film resistor (33K) 5 Metal Film resistor (27K) 2 Metal Film resistor (22K) 5 Metal Film resistor (14K) 2 Metal Film resistor (10K) 10 Metal Film resistor (4.7K) 2 Metal Film resistor (2K) 5 Metal Film resistor (1K) 10
Misc ❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Labor PSU Connector PCB Item Quantity EDUPDB2 Main PCB 1
Connectors Item Quantity 2x8 Pin Sockets 3 8-pin male header 2
Labor Scope VIDEO
Video © 2025 Moritz Klein
PCB Item Quantity EDUSCP2 Main PCB 1
Connectors Item Quantity 4-pin female header 1 8-pin male header 2
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
mki x es.EDU System DIY Eurorack Case
Kit contains the Quantity needed for building 1 unit, except the parts for the optional +5V Power Supply
Case Item Quantity 12V 1A AC/DC Wall Adapter 1 84HP Eurorack Case 1 DC Socket 1 Power Switch 1
Power Supply Item Quantity 2x8 Pin Sockets 14 5mm Green LED 1 5mm Red LED 1 EDU DIY PSU PCB 1 Electrolytic Capacitor (100uF) 1 Electrolytic Capacitor (220uF) 2 KF301 Screw Terminal (5mm pitch) 2 Metal Film resistor (3K) 2 Mornsun DC/DC converter 1 Resettable Fuse (RB300-30) 1 Schottky diode (1N5819) 1
Optional: +5V Power Supply Item Quantity 5mm Red LED 1 Electrolytic Capacitor (10uF) 2 Film Capacitor (0.1uF) 2 Metal Film resistor (1K) 1 Voltage Regulator (78M05) 1
✅ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Sequencer The sequencer steps through a different number of voltages, selectable by a potentiometer for each step. You also have the ability to switch each step on or off via it's Gate toggle switch and to change the tempo via the Rate selector.
Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUSEQ4 PCB 1 EDUSEQ4 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 1 Ceramic Capacitor (100nF) 5 Ceramic Capacitor (1nF) 1
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 15
Integrated Circuits Item Quantity Transistor NPN (2N3904) 5 Transistor NPN (BC547) 1 Op Amp Quad (TL074) 1 Decade Counter (CD4017) 1 14 Pin DIP Sockets 1 16 Pin DIP Sockets 1
Potentiometers Item Quantity Vertical Trim Potentiometer (B250K) 1 Vertical Trim Potentiometer (B100K) 5 PCB Mount Trim Potentiometer (5K) 1 PCB Mount Trim Potentiometer (2K) 2
Resistors Item Quantity Metal Film resistor (100K) 14 Metal Film resistor (68K) 1 Metal Film resistor (51K) 1 Metal Film resistor (47K) 1 Metal Film resistor (18K) 1 Metal Film resistor (6.8K) 1 Metal Film resistor (4.7K) 1 Metal Film resistor (1K) 7 Metal Film resistor (200R) 1 Metal Film resistor (10R) 2
Misc Item Quantity DW1 SPDT ON-ON Sub-mini Toggle Switch 6 DW4 DPDT ON-OFF-ON Sub-mini Toggle Switch 1 3mm Red LED 5 Mono Audio Jack 5 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2022 Moritz Klein
✅ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Voltage Controlled Oscillator (VCO) To make music you need something to make noise, noise is created via an oscillation at different frequencies controlled by the Coarse and Fine potentiometers.
Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUVCO3 PCB 1 EDUVCO3 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 1 Ceramic Capacitor (100nF) 5 Film Capacitor (2.2nF) 1
Diodes Item Quantity Signal Diode (1N4148) 1 Schottky Diode (SB140) 2
Integrated Circuits Item Quantity Transistor NPN (BC548) 1 Transistor PNP (BC558) 1 Op Amp Quad (TL074) 1 Hex Schmitt-Trigger Inverter (CD40106) 1 14 Pin DIP Sockets 2
Potentiometers Item Quantity PCB Mount Trim Potentiometer (1K) 1 Vertical Alpha Potentiometer (B100K) 1 Vertical Trim Potentiometer (B100K) 2 Vertical Trim Potentiometer (B250K) 1 Vertical Trim Potentiometer (B1M) 1
Resistors Item Quantity Metal Film resistor (1M) 2 Metal Film resistor (100K) 9 Metal Film resistor (68K) 2 Metal Film resistor (47K) 1 Metal Film resistor (33K) 1 Metal Film resistor (14K) 1 Metal Film resistor (1.5K) 1 Metal Film resistor (1K) 2 Metal Film resistor (10R) 2
Misc Item Quantity 10K thermistor 4 Mono Audio Jack 5 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2020 Moritz Klein
✅ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Voltage Controlled Filter (VCF) To change the way the noise sounds you can modify it using a filter. This filter is a low pass filter known as a diode ladder VCF.
Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUVCF1 PCB 1 EDUVCF1 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 2 Ceramic Capacitor (100nF) 6 Film Capacitor (1nF) 5
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 9
Integrated Circuits Item Quantity Op Amp Quad (TL074) 2 14 Pin DIP Sockets 2
Potentiometers Item Quantity PCB Mount Trim Potentiometer (50K) 1 Vertical Trim Potentiometer (B100K) 4 Vertical Alpha Potentiometer (B100K) 1
Resistors Item Quantity Metal Film resistor (100K) 5 Metal Film resistor (68K) 2 Metal Film resistor (33K) 8 Metal Film resistor (27K) 2 Metal Film resistor (14K) 1 Metal Film resistor (2K) 2 Metal Film resistor (1K) 3 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 4 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2020 Moritz Klein
✅ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Envelope Generator (EG) The Envelope generator shapes the amplitude of a sound over time the one in this kit is known as an ADSR envelope generator. ADSR stands for Attack, Decay, Sustain, Release. Attack is how fast the sound ramps up, Decay is how fast the sound ramps down, Sustain is how long the sound lasts for and Release is how fast the sound stops.
Quantity is for 1 unit, kit contains enough parts for 2 units.
PCB Item Quantity EDUENV1 PCB 1 EDUENV1 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 2 Ceramic Capacitor (100nF) 8
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 6
Integrated Circuits Item Quantity Transistor NPN (BC548) 1 Op Amp Dual (TL072) 3 8 Pin DIP Sockets 3
Potentiometers Item Quantity Vertical Trim Potentiometer (A1M) 2 Vertical Trim Potentiometer (A100K) 1
Resistors Item Quantity Metal Film resistor (100K) 10 Metal Film resistor (47K) 1 Metal Film resistor (10K) 1 Metal Film resistor (1K) 2 Metal Film resistor (470R) 1 Metal Film resistor (100R) 1 Metal Film resistor (10R) 2
Misc Item Quantity DW1 SPDT ON-ON Sub-mini Toggle Switch 1 3mm Red LED 1 Mono Audio Jack 3 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2021 Moritz Klein
✅ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Voltage Controlled Amplifier (VCA) A Voltage Controlled Amplifier allows you to control the Gain of an input via a control voltage. It can have a few uses such as shaping the output of an envelope generator or muting a step of a sequence using the Gate of the sequencer.
Kit contains the Quantity needed for building 1 unit, and I have purchased one more as "you can never have too many VCAs".
PCB Item Quantity EDUVCA2 PCB 1 EDUVCA2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Ceramic Capacitor (100nF) 6
Diodes Item Quantity Schottky Diode (SB140) 2
Integrated Circuits Item Quantity Transistor NPN (BC548) 4 Op Amp Dual (TL072) 2 8 Pin DIP Sockets 2
Potentiometers Item Quantity PCB Mount Trim Potentiometer (100K) 2 Vertical Trim Potentiometer (B100K) 2
Resistors Item Quantity Metal Film resistor (100K) 12 Metal Film resistor (82K) 2 Metal Film resistor (20K) 6 Metal Film resistor (10K) 6 Metal Film resistor (1K) 2 Metal Film resistor (100R) 4 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 6 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2021 Moritz Klein
✅ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Mixer Quantity is for 1 unit, kit contains enough parts for 1 unit and Drums Bundle contans enough for a second.
PCB Item Quantity EDUMIX2 PCB 1 EDUMIX2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Ceramic Capacitor (100nF) 6
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 2
Integrated Circuits Item Quantity Op Amp Dual (TL072) 2 8 Pin DIP Sockets 2
Potentiometers Item Quantity PCB Mount Trim Potentiometer (20K) 1 Vertical Trim Potentiometer (B100K) 3
Resistors Item Quantity Metal Film resistor (100K) 8 Metal Film resistor (27K) 1 Metal Film resistor (1K) 3 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 6 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2022 Moritz Klein
🔧 Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Noise/Sample & Hold (S&H) Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUSH2 PCB 1 EDUSH2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 3 Film Capacitor (1uF) 2 Film Capacitor (470nF) 1 Ceramic Capacitor (100nF) 8 Film Capacitor (100nF) 1 Film Capacitor (5.6nF) 2 Film Capacitor (2.2nF) 2 Ceramic Capacitor (1nF) 1 Film Capacitor (680pF) 2
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 2
Integrated Circuits Item Quantity Transistor NPN (2N3904) 1 Transistor NPN (BC548) 1 Transistor JFET (J113) 1 Op Amp Dual (TL072) 1 Op Amp Quad (TL074) 2 8 Pin DIP Sockets 1 14 Pin DIP Sockets 2
Potentiometers Item Quantity Vertical Alpha Potentiometer (B250K) 1 Vertical Trim Potentiometer (B100K) 2
Resistors Item Quantity Metal Film resistor (1M) 2 Metal Film resistor (470K) 2 Metal Film resistor (100K) 12 Metal Film resistor (51K) 1 Metal Film resistor (47K) 1 Metal Film resistor (33K) 2 Metal Film resistor (22K) 1 Metal Film resistor (20K) 1 Metal Film resistor (10K) 1 Metal Film resistor (4.7K) 2 Metal Film resistor (2K) 1 Metal Film resistor (1K) 6 Metal Film resistor (680R) 1 Metal Film resistor (10R) 2
Misc Item Quantity 3mm Red LED 1 Mono Audio Jack 8 10 Pin Power Header 1 10-16 pin Power Cable 1
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Wavefolder Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUWAVE1 PCB 1 EDUWAVE1 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 1 Ceramic Capacitor (100nF) 4 Film Capacitor (2.2nF) 2
Diodes Item Quantity Schottky Diode (SB140) 2
Integrated Circuits Item Quantity Transistor NPN (BC548) 4 Transistor PNP (BC558) 2 Op Amp Quad (TL074) 1 14 Pin DIP Sockets 1
Potentiometers Item Quantity PCB Mount Trim Potentiometer (10K) 1 Vertical Trim Potentiometer (B10K) 1
Resistors Item Quantity Metal Film resistor (220K) 1 Metal Film resistor (100K) 3 Metal Film resistor (51K) 1 Metal Film resistor (22K) 1 Metal Film resistor (20K) 4 Metal Film resistor (10K) 4 Metal Film resistor (1K) 5 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 3 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2022 Moritz Klein
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Output Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUOUT1 PCB 1 EDUOUT1 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 2 Ceramic Capacitor (100nF) 6 Ceramic Capacitor (22pF) 2
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 12
Integrated Circuits Item Quantity Transistor NPN (BD139) 2 Transistor PNP (BD140) 2 Op Amp Dual (TL072) 2 8 Pin DIP Sockets 2
Potentiometers Item Quantity Vertical Trim Potentiometer (B10K) 2 Vertical Trim Potentiometer (B100K) 2
Resistors Item Quantity Metal Film resistor (200K) 2 Metal Film resistor (100K) 6 Metal Film resistor (30K) 2 Metal Film resistor (10K) 4 Metal Film resistor (3.6K) 4 Metal Film resistor (1K) 6 Metal Film resistor (470R) 2 Metal Film resistor (47R) 2 Metal Film resistor (10R) 2 Metal Film resistor (2R) 4
Misc Item Quantity Mono Audio Jack 2 Stereo Audio Jack 2 10 Pin Power Header 1 10-16 pin Power Cable 1
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
EDU DIY Effects Compressor Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUCOMP2 PCB 1 EDUCOMP2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1.5uF) 3 Ceramic Capacitor (100nF) 8 Ceramic Capacitor (680pF) 1
Diodes Item Quantity Signal Diode (1N4148) 13 Schottky Diode (SB140) 2
Integrated Circuits Item Quantity Transistor NPN (2N3904) 5 Op Amp Dual (TL072) 2 Op Amp Quad (TL074) 1 8 Pin DIP Sockets 2 14 Pin DIP Sockets 1
Potentiometers Item Quantity Vertical Trim Potentiometer (A1M) 1 Vertical Trim Potentiometer (A500K) 1 Vertical Trim Potentiometer (A100K) 2 Vertical Trim Potentiometer (A20K) 1 Vertical Trim Potentiometer (A10K) 1
Resistors Item Quantity Metal Film resistor (470K) 2 Metal Film resistor (330K) 1 Metal Film resistor (220K) 1 Metal Film resistor (120K) 1 Metal Film resistor (100K) 11 Metal Film resistor (47K) 1 Metal Film resistor (33K) 4 Metal Film resistor (20K) 1 Metal Film resistor (10K) 4 Metal Film resistor (3.3K) 4 Metal Film resistor (2K) 1 Metal Film resistor (470R) 1 Metal Film resistor (200R) 1 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 3 3mm Red LED 2 3mm Green LED 3 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Videos © 2023 Moritz Klein
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Bucket Brigade Delay (BBD) Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUBBD2 PCB 1 EDUBBD2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Electrolytic Capacitor (3.3uF) 2 Film Capacitor (1uF) 2 Film Capacitor (15nF) 1 Ceramic Capacitor (100nF) 12 Ceramic Capacitor (1nF) 1 Ceramic Capacitor (220pF) 2
Diodes Item Quantity Signal Diode (1N4148) 5 Schottky Diode (SB140) 2
Integrated Circuits Item Quantity N-CH JFET (J113) 1 5V Regulator (78L05) 1 Op Amp Dual (TL072) 3 BBF 4096 (V3205SD) 1 PLL (CD4046BE) 1 8 Pin DIP Sockets 3 14 Pin DIP Sockets 1 16 Pin DIP Sockets 1
Potentiometers Item Quantity Vertical Alpha Potentiometer (B100K) 1 Vertical Trim Potentiometer (A100K) 1 Vertical Trim Potentiometer (B100K) 2 Vertical Trim Potentiometer (B10K) 1
Resistors Item Quantity Metal Film resistor (2.2M) 1 Metal Film resistor (100K) 9 Metal Film resistor (82K) 1 Metal Film resistor (62K) 1 Metal Film resistor (51K) 1 Metal Film resistor (47K) 1 Metal Film resistor (39K) 1 Metal Film resistor (22K) 3 Metal Film resistor (10K) 2 Metal Film resistor (6.2K) 1 Metal Film resistor (4.7K) 1 Metal Film resistor (1K) 1 Metal Film resistor (470R) 2 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 5 DW1 SPDT ON-ON Sub-mini Toggle Switch 1 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Video © 2024 Moritz Klein
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
EDU DIY Drums Kick Drum Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUKICK2 PCB 1 EDUKICK2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (220nF) 1 Ceramic Capacitor (100nF) 6 Film Capacitor (15nF) 3 Film Capacitor (10nF) 1 Film Capacitor (3.3nF) 1
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 7
Integrated Circuits Item Quantity Transistor NPN (BC548) 3 Transistor PNP (BC558) 2 Op Amp Dual (TL072) 2 8 Pin DIP Sockets 2
Potentiometers Item Quantity Vertical Alpha Potentiometer (B1M) 1 Vertical Trim Potentiometer (B250K) 1 Vertical Trim Potentiometer (A100K) 1 Vertical Trim Potentiometer (B100K) 2 Vertical Trim Potentiometer (B50K) 1 Vertical Trim Potentiometer (B10K) 1
Resistors Item Quantity Metal Film resistor (1M) 2 Metal Film resistor (470K) 1 Metal Film resistor (120K) 1 Metal Film resistor (100K) 5 Metal Film resistor (47K) 2 Metal Film resistor (39K) 1 Metal Film resistor (33K) 2 Metal Film resistor (14K) 1 Metal Film resistor (10K) 2 Metal Film resistor (2K) 1 Metal Film resistor (1K) 3 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 4 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Video © 2023 Moritz Klein
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Hi-Hat Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUHHAT2 PCB 1 EDUHHAT2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 1 Ceramic Capacitor (470nF) 1 Ceramic Capacitor (100nF) 13 Ceramic Capacitor (10nF) 1 Ceramic Capacitor (2.2nF) 1 Ceramic Capacitor (1nF) 2 Ceramic Capacitor (330pF) 2 Ceramic Capacitor (100pF) 1
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 6
Integrated Circuits Item Quantity Transistor NPN (BC548) 4 Transistor PNP (BC558) 2 Op Amp Dual (TL072) 3 Hex Schmitt-Trigger Inverter (CD40106) 1 8 Pin DIP Sockets 3 14 Pin DIP Sockets 2
Potentiometers Item Quantity Vertical Trim Potentiometer (B250K) 1 Vertical Alpha Potentiometer (B100K) 1 Vertical Trim Potentiometer (B10K) 2
Resistors Item Quantity Metal Film resistor (1M) 1 Metal Film resistor (820K) 1 Metal Film resistor (470K) 1 Metal Film resistor (120K) 1 Metal Film resistor (100K) 18 Metal Film resistor (82K) 1 Metal Film resistor (68K) 1 Metal Film resistor (56K) 1 Metal Film resistor (51K) 1 Metal Film resistor (47K) 3 Metal Film resistor (39K) 2 Metal Film resistor (33K) 2 Metal Film resistor (22K) 1 Metal Film resistor (10K) 1 Metal Film resistor (4.7K) 1 Metal Film resistor (1K) 3 Metal Film resistor (680R) 1 Metal Film resistor (100R) 1 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 5 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Video © 2023 Moritz Klein
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Snare Drum Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUSNAR1 PCB 1 EDUSNAR1 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 1 Ceramic Capacitor (470nF) 2 Ceramic Capacitor (100nF) 8 Film Capacitor (33nF) 3 Film Capacitor (10nF) 2 Ceramic Capacitor (2.2nF) 2 Film Capacitor (1nF) 2
Diodes Item Quantity Schottky Diode (SB140) 2 Signal Diode (1N4148) 6
Integrated Circuits Item Quantity Transistor NPN (BC548) 5 Transistor PNP (BC558) 2 Op Amp Dual (TL072) 3 8 Pin DIP Sockets 3
Potentiometers Item Quantity Vertical Trim Potentiometer (B250K) 1 Vertical Trim Potentiometer (A100K) 1 Vertical Trim Potentiometer (B100K) 1 Vertical Trim Potentiometer (B5K) 1 Vertical Alpha Potentiometer (B1K) 1
Resistors Item Quantity Metal Film resistor (1M) 2 Metal Film resistor (910K) 1 Metal Film resistor (470K) 1 Metal Film resistor (120K) 1 Metal Film resistor (100K) 7 Metal Film resistor (47K) 3 Metal Film resistor (39K) 1 Metal Film resistor (33K) 2 Metal Film resistor (27K) 1 Metal Film resistor (22K) 5 Metal Film resistor (10K) 2 Metal Film resistor (1K) 7 Metal Film resistor (470R) 1 Metal Film resistor (330R) 1 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 5 10 Pin Power Header 1 10-16 pin Power Cable 1
How It Works
Video © 2024 Moritz Klein
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
FM Drum Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity EDUFMD2 PCB 1 EDUFMD2 Front Panel 1
Capacitors Item Quantity Electrolytic Capacitor (47uF) 2 Film Capacitor (1uF) 1 Ceramic Capacitor (470nF) 1 Ceramic Capacitor (100nF) 4 Film Capacitor (15nF) 1 Ceramic Capacitor (10nF) 1 Film Capacitor (5.6nF) 1 Film Capacitor (2.2nF) 1 Film Capacitor (470pF) 2 Film Capacitor (330pF) 1
Diodes Item Quantity Schottky Diode (1N5819) 2 Signal Diode (1N4148) 18
Integrated Circuits Item Quantity Transistor NPN (BC548) 8 Transistor PNP (BC558) 5 Op Amp Dual (TL072) 1 Op Amp Quad (TL074) 1 8 Pin DIP Sockets 1 14 Pin DIP Sockets 1
Potentiometers Item Quantity PCB Mount Trim Potentiometer (2M) 1 Vertical Trim Potentiometer (B1M) 1 Vertical Trim Potentiometer (A500K) 1 Vertical Trim Potentiometer (B250K) 1 Vertical Alpha Potentiometer (A100K) 2 Vertical Trim Potentiometer (A100K) 1
Resistors Item Quantity Metal Film resistor (1M) 4 Metal Film resistor (470K) 3 Metal Film resistor (330K) 1 Metal Film resistor (200K) 1 Metal Film resistor (100K) 16 Metal Film resistor (68K) 1 Metal Film resistor (51K) 2 Metal Film resistor (47K) 1 Metal Film resistor (39K) 2 Metal Film resistor (33K) 3 Metal Film resistor (18K) 1 Metal Film resistor (10K) 7 Metal Film resistor (5.6K) 1 Metal Film resistor (4.7K) 1 Metal Film resistor (2K) 2 Metal Film resistor (1K) 4 Metal Film resistor (470R) 1 Metal Film resistor (47R) 1 Metal Film resistor (10R) 2
Misc Item Quantity Mono Audio Jack 5 DW1 SPDT ON-ON Sub-mini Toggle Switch 2
How It Works
Video © 2025 Moritz Klein
❎ Assembly Assembly Instructions are available in the User Manual on the Erica Synths Website
Bleep Sound Basic ADSR Parts PCB Item Quantity Received Notes ADSR Front Panel 1 1 ADSR PCB 1 1 1 ADSR PCB 2 1 1
Capacitors Item Quantity Received Notes Ceramic Capacitor (100nF) 3 100 in stock Ceramic Capacitor (10nF) 1 100 on order Electrolytic Capacitor (10uF) 3 2 Electrolytic Capacitor (4.7uF) 1 1 Electrolytic Capacitor (1uF) 1 1
Diodes Item Quantity Received Notes Signal Diode (1N4148) 5 25 in stock
Integrated Circuits Item Quantity Received Notes 8 Pin DIP Sockets 2 15 in stock Op Amp Dual (TL072) 1 10 in stock Timer (LM555) 1 10 in stock Transistor NPN (BC547) 4 100 in stock Will replace with BC548
Potentiometers Item Quantity Received Notes Aluminum Knob for Alpha Potentiometer 4 4 Vertical Alpha Potentiometer (B1M) 3 3 Vertical Alpha Potentiometer (B10K) 1 1
Resistors Item Quantity Received Notes Metal Film resistor (22K) 1 100 on order Metal Film resistor (10K) 2 100 in stock Metal Film resistor (4.7K) 4 100 on order Metal Film resistor (1K) 1 100 in stock Metal Film resistor (100R) 3 100 in stock
Misc Item Quantity Received Notes 5mm Red Square LED 1 1 8 Pin Header 2 2 8 Pin Socket 2 2 10 Pin Power Header 1 1 10-16 pin Power Cable 1 1 25cm length Mono Audio Jack 2 2 DWB1 SPDT ON-ON Mini Toggle Switch 1 1
❎ Assembly BOM and Build Information are available on the Bleep Sound Website
Basic DC mixer Parts PCB Item Quantity Received Notes DC Mixer Front Panel 1 1 DC Mixer PCB 1 1
Capacitors Item Quantity Received Notes Electrolytic Capacitor (10uF) 2 2
Integrated Circuits Item Quantity Received Notes 8 Pin DIP Sockets 1 15 in stock Op Amp Dual (TL072) 1 10 in stock
Potentiometers Item Quantity Received Notes Aluminum Knob for Alpha Potentiometer 4 4 Vertical Alpha Potentiometer (B10K) 4 4
Resistors Item Quantity Received Notes Metal Film resistor (100K) 5 100 in stock Metal Film resistor (10K) 2 100 in stock Metal Film resistor (4.7K) 4 100 on order
Misc Item Quantity Received Notes 5mm Red Square LED 4 4 10 Pin Power Header 1 1 10-16 pin Power Cable 1 1 25cm length DWB3 DPDT ON-ON Mini Toggle Switch 4 5 Mono Audio Jack 6 6
❎ Assembly BOM and Build Information are available on the Bleep Sound Website
Free Modular Boost Parts PCB Item Quantity Received Notes Boost Front Panel 1 Boost PCB 1
Capacitors Item Quantity Received Notes Ceramic Capacitor (470nF) 1 Ceramic Capacitor (100nF) 2 100 in stock Ceramic Capacitor (10nF) 1 100 on order Ceramic Capacitor (33pF) 1 Electrolytic Capacitor (10uF) 2 5 in stock Optional power supply filtering capacitors
Diodes Item Quantity Received Notes Signal Diode (1N4148) 2 25 in stock
Integrated Circuits Item Quantity Received Notes 14 Pin DIP Sockets 1 10 in stock Op Amp Quad (TL074) 1 10 in stock Transistor NPN (2N3904) 1 Optional for high-impedance input
Potentiometers Item Quantity Received Notes Aluminum Knob for Alpha Potentiometer 2 Vertical Alpha Potentiometer (B50K) 2
Resistors Item Quantity Received Notes Metal Film resistor (750K) 1 Metal Film resistor (560K) 1 Metal Film resistor (100K) 2 100 in stock Metal Film resistor (24K) 1 Metal Film resistor (18K) 1 Metal Film resistor (15K) 1 Metal Film resistor (10K) 2 100 in stock Metal Film resistor (2.4K) 1 Metal Film resistor (2K) 1 100 in stock Metal Film resistor (1K) 1 100 in stock
Misc Item Quantity Received Notes 10 Pin Power Header 1 8 in stock 10-16 pin Power Cable 1 Mono Audio Jack 2 29 in stock
❎ Assembly Assembly Instructions are available on the Free Modular Website along with the User Manual
MH Eurorack Bypass Parts I purchased this as PCB and Panel only, I sourced the rest of the parts for the kit myself.
Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity Bypass Front Panel 1 Bypass PCB 1
Potentiometers Item Quantity Aluminum Knob for Alpha Potentiometer 2 Vertical Alpha Potentiometer (A100K) 2
Misc Item Quantity DW3 DPDT ON-ON Sub-mini Toggle Switch 1 Mono Audio Jack 6
❎ Assembly Assembly Instructions are available in the Assembly Guide on the MH Eurorack Website
TRS Parts I purchased this as PCB and Panel only, I sourced the rest of the parts for the kit myself.
Kit contains the Quantity needed for building 1 unit.
PCB Item Quantity TRS Front Panel 1 TRS PCB 1
Potentiometers Item Quantity Aluminum Knob for Alpha Potentiometer 1 Vertical Alpha Potentiometer - Dual Gang (A50K) 1
Misc Item Quantity DW4 DPDT ON-OFF-ON Sub-mini Toggle Switch 1 Mono Audio Jack 2 Stereo Audio Jack 8
❎ Assembly Assembly Instructions are available in the Assembly Guide on the MH Eurorack Website
UMIX Parts PCB Item Quantity Received Notes UMIX Front Panel 1 UMIX PCB 1
Capacitors Item Quantity Received Notes Ceramic Capacitor (100nF) 6 100 in stock Electrolytic Capacitor (22uF) 2 5 in stock I will replace with 20uF
Diodes Item Quantity Received Notes Schottky Diode (1N5818) 2 10 in stock I will replace with 1N5819
Integrated Circuits Item Quantity Received Notes 8 Pin DIP Sockets 1 15 in stock Op Amp Dual (TL072) 1 10 in stock
Resistors Item Quantity Received Notes Metal Film resistor (100K) 10 100 in stock Metal Film resistor (50K) 4 I will replace with 100K (As can be seen in the parts image on the eBay listing ) Metal Film resistor (1K) 2 100 in stock Metal Film resistor (10R) 2 100 in stock
Misc Item Quantity Received Notes 2 Pin Header 2 2 in stock 3 Pin Header 1 1 in stock 10 Pin Power Header 1 8 in stock 10-16 pin Power Cable 1 Jumper Cap 2.54mm 3 109 in stock Mono Audio Jack 8 29 in stock
❎ Assembly Assembly Instructions are available in the Assembly Guide on the MH Eurorack Website
