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J²B Synthesizer

An open-minded digital music platform

J²B Synthesizer
This project was born after I discovered the Atmegatron music synthesizer from Soulsby Synthesizers [1]. This synthesizer is built around an ATmega328 8-bit AVR microcontroller from Atmel, the same that is at the heart of the Arduino Uno board.
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Specifications • Monophonic 9-bit synthesizer • 32 waveforms + user defined • 15 filter types • 2 envelope generators • LFO with 16 waveforms • 15-pattern arpeggiator • 16 patch memories • 6 live controls • MIDI • Patch saving/loading over MIDI • NXP LPC1347 32-bit ARM Cortex-M3 microcontroller • 2 output channels • Open Source & Open Hardware design
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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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Component List
Main Board
Default: SMD 0805, 5%, 0.1 W
R1,R22,R26,R45,R49,R64,R68 = 0Ohm
R2,R13,R59,R77,R79,R94,R98,R99 = 100kOhm
R3,R4 = 33Ohm
R5-R12,R21,R24,R25,R28–R32,R44,R47,R48,R51,R52,R53,R57,R58,R63,R66,R67,R70–R75,R91,R92 = 10kOhm
R14,R80,R101 = 1kOhm
R16 = 1.5 kOhm
R17 = 1MOhm
R20 = 47Ohm, 1206, 0.25W
R33,R34 = 4.7kOhm
R35,R37,R54,R85,R102 = 270Ohm
R36,R38 = 220Ohm
R39,R82 = 82kOhm
R40,R83 = 180Ohm
R41,R81 = 8.2kOhm
R55,R73,R86,R93 = 6.8kOhm
R56,R87,R88,R90,R96,R100 = 3.3kOhm
R60,R89 = 820Ohm
R78,R97 = 100Ohm
R76,R84 = 10Ohm
P1 = 10kOhm Potentiometer, stereo, logarithmic law
! R15,R18,R19,R23,R27,R42,R43,R46,R50,R61,R62,R65,R69,R95 = not mounted
Default: SMD 0805
C1,C16,C22,C36,C48,C49 = 100nF
C3,C37,C40,C52 = 100µF 6.3V tantalum, size B
C4,C8,C17,C20 = 18pF
C5,C11,C35,C41,C42,C47,C50,C51,C55 = 10µF 6.3 V tantalum
C6,C7,C9,C10,C12-C15,C18,C23-C27,C31-C34,C43 = 10nF
C19,C21 = 1µF
C28,C44 = 15nF
C29,C30,C39,C45,C46,C54 = 680pF
C38,C53 = 220nF
! C2 = not mounted
L1,L2,L3 = ferrite bead, 0.21Ohm, 0.6A, SMD 0805
D1–D9 = BAT54C (SOT-23)
D10 = MBR0540T1G
IC2 = LPC1347FBD48
IC1 = LD1117S33CTR
IC3,IC4 = MCP6004-I/SL
IC5 = TDA1308T/N2
LED1,LED2 = LED, bi-color red-green, CC, 5mm
LED3 = LED, red, 3mm
T1–T6 = BSS84P (SOT-23)
K1 = 4-pin pinheader, 0.1" pitch
K2 = 8-pin pinheader, 0.1" pitch
K3 = jack 3.5 mm, stereo
K4 = mini USB-B connector, shielded
S1–S8 = Rotary encoder
S9 = pushbutton, Multimec 3FTL6
LCD1 = LCD 2x16, I²C, e.g. Midas MCCOG21605B6W-SPTLYI
X1 = 12MHz quartz crystal
BOX1 = Hammond type 1597DGY or laser cut.
Main board, PCB # 140182-1 (Elektor Store)
MIDI board, PCB # 140182-2 (Elektor Store)
Component List
MIDI Board
Default: SMD 0805, 5%, 0.1W
R201,R202,R203 = 220Ohm
R204 = 1kOhm
D201 = BAT54C (SOT-23)
IC201 = CNY17-3 (DIP-6)
K201 = 4-way pinheader socket, 0.1" pitch, vertical
K202,K203 = 5-way DIN socket, PCB mount, 180°
MIDI board: PCB # 140182-2 (Elektor Store)

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