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Fjöl

hallmar·Eurorack-Modules·Fjöl-v0.5/Hardware/fjöl.kicad_pcb

Fjöl PCB layout, top view — open source NXP board by hallmar

About the Fjöl PCB

Fjöl is an open source NXP PCB design by hallmar, published on GitHub. It is a board measuring 91.3 × 128.3 mm, with 116 components from 47 distinct parts.

Its main chip is the TEENSY40, from the NXP family. Other key parts include the 78DT, REG1117, 741G17DBV, LM4040B10 and TL074. By type, the board carries 35 capacitors, 22 resistors, 10 ICs, 10 inductors, 4 jumpers and 2 crystals.

It belongs with the audio designs in this gallery.

From the project

Current hardware uses a high quality DAC(PCM5100) with 16bit/44.1kHz quality.

Current hardware uses a high quality DAC(PCM5100) with 16bit/44.1kHz quality.

It has MIDI IN and MIDI OUT/THRU. It uses the Arturia Standard for DIN to stereo jack, so type B midi. You can find adapters in almost every synthstore now.

KiCAD Arduino IDE * Audio System Design Tool for Teensy Audio Library

But if you want to sell or do something with the software or hardware then it'd be nice to include my name and link to my Github somewhere :)

Fjöl, from the project README
From the project README

Main components on the Fjöl

78DTREG1117741G17DBVLM4040B10TL074TL072PCM5100TEENSY40OLED-1.3

Fjöl bill of materials (BOM)

116 components, 47 distinct parts.

QtyPartRefs
2
78DT
IC1, IC5
1
REG1117
IC2
1
741G17DBV
IC3
1
LM4040B10
IC4
1
TL074
IC7
1
TL072
U1
1
PCM5100
U2
1
TEENSY40
U$1
1
OLED-1.3
U$2
1
2510-
X1
1
KUSBVX
X2
6
50k-lin
ATTACK1, DECAY1, FM1, FM2, RATIO1, RATIO2
2
50k lin
CTL1, CTL2
10
THONKICONNNEW
CV-CTL1, CV-CTL2, CV-DEC1, CV-FM1, CV-FM2, CV-RAT1, CV-RAT2, GATE-OUT1 +2
1
50k
GAINLEFT2
2
PINHD-1X14
JP1, JP2
2
PINHD-1X12
JP3, JP4
2
THONKI-STEREO
MIDI-IN1, MIDI-THRU1
1
MA04-2
SV1
3
MA03-1
SV2, SV4, SV6
Show 27 more
QtyPartRefs
2
MA10-1
SV3, SV5
1
EC12E_SW
SW1
1
BC847
T1
1
2,54_1,0
TP1
1
LED3MM
LED1
2
STPS1L30U
D2, D3
1
33u
L1
1
WE-CBF_0603
L2
3
BLM21PG221SN1D
L3, L4, L5
4
BLM21AG102SN1D
L6, L7, L8, L9
1
2,54_1,0
L-OUT1
16
100n
C1, C3, C6, C14, C15, C16, C17, C18 +8
5
100µ
C2, C5, C11, C12, C13
2
22u
C7, C8
4
10u
C9, C10, C19, C21
2
2.2u
C20, C22
2
100p
C28, C29
2
1n
C30, C31
2
10n
C40, C42
6
1k
R4, R36, R37, R40, R41, R43
2
2.2K
R5, R6
6
10K
R8, R34, R35, R38, R39, R42
2
200k
R9, R12
2
100k
R10, R13
2
66.5k
R17, R18
1
33
R32
1
10
R33

Fjöl design files

The KiCad project lives in the hallmar/Eurorack-Modules repository on GitHub; these links point at the commit this page was built from.

Fjöl: common questions

What microcontroller does the Fjöl use?

The Fjöl is built around the TEENSY40, from the NXP family.

How big is the Fjöl PCB?

The Fjöl measures 91.3 × 128.3 mm and is 1.6 mm thick.

How many components are on the Fjöl?

116 components, from 47 distinct parts. The full bill of materials is listed on this page.

Where can I download the Fjöl design files?

From the hallmar/Eurorack-Modules repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Fjöl design in my own project?

The repository has no license, so all rights stay with hallmar. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Fjöl without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug NXP firmware against it before you order a PCB.

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