ER-MOZZI-DB-03

Features

• Eurorack card optimized to use with MOZZI Arduino library
• Daughtercard to ER-PROTO-02 card
  • Uses Front Panel and Controls card
    • Controls card populated as required
      • Up to 6 Pots
      • Up to 5 in/out jacks
      • High Def Sound output jack
• Any jack/pot can be "jumpered" to any Arduino pin
• Arduino Nano
  • ATMega328 CPU Comparable with Arduino UNO
  • 5V, 16 MHz
  • USB interface, on USB Mini
  • Installs onto female header/removable
  • DC regulator
  • Reset pushbutton
• +12V operation
• 108.5mmx28mm card

Arduino Pins

• The Arduino NANO has 8 Analog Inputs (0-7)
• The Arduino NANO has 11 Digital I/O pins (2-13)
  • D0, D1 are used for the Serial port
• The ER-PROTO-02 controls card has 6 pots (RV1-RV6) and 6 jacks (J1-J6)
  • 6 Pots are brought into this card
  • 6 Jacks are brought into this card
    • J1-J5 Jacks can be used for analog inputs, digital inputs or digital outputs
    • J6 Jack is a dedicated output (J6) connected to Hi Def output Arduino pins D9, D10
• Any jack/pot can be "jumpered" to any Arduino pin

Jacks Pin Protection Circuit

• Example circuit configured as input
  • Same circuit on all 5 J1-J5 jacks

• Configured as input
  • I/O Protection
    • Diode Clamps
  • Series resistor (R12 in example)
    • Works along with diode clamps
    • 10K Typical value
  • Parallel resistor (R13 in example)
    • 100K typical value
    • Lightly pulls input to ground when no jack is connected
  • Parallel capacitor (C13 in example)
    • 10nF or 0.1uF are typical values
    • Smooths analog input (noise reduction)
  • 0 Ohm Series resistor on Controls card for 5V inputs
    • Goes to jack tip pin
• Configured as output
  • I/O Protection - Diode Clamps
  • 0 Ohm Series resistor (R12 in example)
  • DNP (Do Not Populate) Parallel resistor (R13 in example)
  • DNP Parallel capacitor (C13 in example)
  • Typical 470 or 1K Ohm Series resistor on Controls card
    • Goes to jack tip pin
    • Works along with diode clamps

Jacks Pin Protection Circuit Reference Designator cross reference table

• Location of input circuitry on cards

JACK	R SERIES	R PARALLEL	C PARALLEL	DIODES
J1	R3	R4	C10	D3/D4
J2	R1	R2	C9	D1/D2
J3	R7	R8	C12	D7/D8
J4	R5	R6	C11	D5/D6
J5	R12	R13	C13	D9/D10

Jacks/Headers

J1 - Arduino Analog Pins

J2 - Jacks Pins

• Use right angle header if using BERG jumpers

J7 - Jacks connections to Controls card

J8 - Pots connections to Controls card

J9 - Eurorack Power

• Power filter

J10 - Arduino Digital Pins

Controls Card Pots/Jacks

• Up to 6 pots
• Up to 6 jacks

Pots on Controls card

• Jumpers to pull up/down ends of pots
• Typical 100K pot
• Typical 1K series resistor on pot wiper

Jacks on Controls card

• Tip has series resistor
• Ring/Tip switch
  • PJ-398 has tip switch
  • PJ-366ST has stereo ring connection
    • Ring has series resistor

Software / Example Projects

• HAGIWO Bezier curve random CV generator
• HAGIWO Envelope Generator Module
• HAGIWO FM VCO Module
• HAGIWO Additive VCO (harmonic addition VCO)
• HAGIWO CHORD VCO with mozzi library
• Using Mozzi Library With 5 Potentiometers
• Atari Punk Synth V2
• Arduino Multi-pot Mozzi FM Synthesis
• Arduino mozzi FM VCO Module for 650 yen - Modular synth self-made
• Nuts and Volts AUDUINO Synth build for the Arduino NANO
  • Files for Nuts and Volts AUDUINO Synth
• MozMo = ATMega328 plus FTDI

HAGIWO MOZZI builds

• HAGIWO builds
• Pots
  • Install RV1-RV4 = 100K
  • Install series resistor R1-R3 1K
  • Install Pull-up/Pull-down jumpers
• Jacks
• J3-J5 = PJ398SM
• J6 = PJ366ST

Additive VCO

• HAGIWO Additive VCO Notes

• 3 pots (Fundamental Frequency, Harmonics Gain, Harmonic)
• 3 CV input jacks (V/Oct, Gain, Harmonic)
• 1 PWM output jack
  • Output swings 1V-4V
• Additive VCO Code

Chord VCO

• HAGIWO Chord VCO

• 3 pots (Root Frequency, Inversion, Chord/Wave)
• 3 CV input jacks (V/Oct, Inversion, Chord/Wave)
• 1 PWM output jack
  • Output swings 2.5V +/- 100mV
• CHORD VCO Code

FM VCO

• HAGIWO FM VCO

• 3 pots (Carrier Frequency, Mod Freq, Mod Level)
• 3 CV input jacks (V/Oct, Mod Freq, Mod Level)
• 1 PWM output jack
  • Output swings 0-5V

• FM VCO Code

Triple Mode VCO

• FM, Additive, Chord modes
• Started from Testbld Code base
  • Replaced mode select switch with RV4 mode select pot
    • RV4 is on Analog 3
    • Add RV4 = 100K to controls card
    • Add R4 = 1K to controls card
    • Add C2 = 0.1uF to controls card
    • Add R4 = 0 ohms jumper to daughtercard
• PWM output
  • Output swings 2V-3V

HAGIWO Bezier Random CV Generator

• HAGIWO Bezier Random CV Generator
  • HAGIWO Bezier Random CV Generator

Assembly Sheet

• ER-MOZZI-DB-03 Rev 1 Assembly Sheet