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OpenEuroBoard

Kicad and Gerber files for the manufacturing of electronic synthesizers prototyping and developing, focusing on utilities to prototype Eurorack modules. All the sections in the board are independent from each other (except the Gate/CV generators) that need the 5V regulator part, and can be disregarded if they're not needed for the user application.

Board

Board (This is from an older version but the features are the same)

Feature List:

  • Size adjusted to fit exactly a standard sized breadboard.
  • SSD1306 driver based Screen interfaces, with sockets for both 128x64px and 128x32px versions.
  • 2x quad op-amps (TL074) for custom use.
  • 5V regulator and power bus.
  • 4x custom push buttons.
  • MIDI IN/OUT interfaces. MIDI IN is isolated through a optocoupler, MIDI OUT is buffered.
  • 8x custom Minijack sockets.
  • 5x pots, 2x custom pots to connect any desired value. The pots can be easily shorted to ground, +12V, or between their own pins using a jumper.
  • 4x custom SPDT switches.
  • 4x custom LEDs.
  • Small jumper storage.
  • A stereo buffered out with a stereo minijack socket.
  • Custom test points and power bus test points.
  • 2x Gate and CV generators, Both signals being 0~5V.
  • 2x oscillators with low (LFO) and high (Audio rate) range switches and frequency pots.
  • Screw mount holes

Bill Of Materials:

Section Type Model Amount
General Male Header 2x5 dupont header 2
Female Header 1x40 dupont header 2
Voltage regulator LM1117-5 1
LED 3mm Red LED 1
Resistor 2.2k 1
Capacitor 100n 2
Elec. Capacitor 10u 4
Screen interfaces Screen SSD1306 1
quad op-amps Op. amp TL074 2
Capacitor 100n 4
Push buttons Push button 6mm push 4
MIDI IN-OUT Din-5 Connector Din-5 Connector 2
Optocoupler 6n139 1
Dual inverter CD40107BE 1
Diode 1n4148 1
Resistor 220 3
Resistor 270 1
Resistor 120 2
Minijack sockets Minijack Thonkiconn jack 8
Potentiometer Potentiometer Alps vertical pot 5
Switches SPDT 8.5mm SPDT 4
LEDS LED 3mm Red LED 4
Resistor 1k 4
Jumper storage Jumper 2.54mm jumper 5
Stereo out Op. amp TL072 1
Capacitor 100n 2
Minijack Vertical stereo jack 1
Gate generators Push button 6mm push 2
Resistor 4.7k 2
CV Generators Potentiometer Alps vertical pot 100k 2
Oscillators Op. amp Tl074 1
Capacitor 100n 4
Potentiometer Alps vertical pot 1M LOG 2
SPDT 8.5mm SPDT 2
Capacitor 1u 2
Capacitor 22n 2
Resistor 1k 4
Resistor 10k 4
Resistor 100k 2

Changelog

  • V1.0 First version
  • V1.1 Addressed the issues from Issue 1. Updated Silkscreen

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Open source Eurorack development board

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