rmini / openeuroboard

Open source Eurorack development board

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.

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	7805	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	2
	Potentiometer	Alps vertical pot 1M LOG	2
	SPDT	8.5mm SPDT	2
	Capacitor	1u	2
	Capacitor	22n	2
	Resistor	1k	2
	Resistor	10k	4
	Resistor	100k	2