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Fjol

hallmar·Eurorack-Modules·Fjöl-v0.6/Hardware/fjol.kicad_pcb

Fjol PCB layout, top view — open source NXP board by hallmar
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About the Fjol PCB

Fjol is an open source NXP PCB design by hallmar, published on GitHub. It is a 2-layer board measuring 184.7 × 110.7 mm, with 204 components from 56 distinct parts.

Its main chip is the Teensy4.1, from the NXP family. Other key parts include the 741G17DBV, L7805, NCP1117-3.3_SOT223, 6N138 and LM4040DBZ-10. By type, the board carries 75 resistors, 47 capacitors, 14 ICs, 12 diodes, 12 inductors and 9 connectors.

It belongs with the audio designs in this gallery.

From the project

Small demo video with non working LED's: https://www.youtube.com/watch?v=nTqA_WNiwQo

Small demo video with non working LED's: https://www.youtube.com/watch?v=nTqA_WNiwQo

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

Fjöl is a 4 voice polyphonic* Phase modulation synthesizer. Using only sine waves you can get the same sounds as an FM synthesizer.

digital ladder LPF with resonance usb A host 3 operator Phase modulation with 3 algorithms(so far) two endless encoders with CV input for adjusting 8 different parameters MIDI IN and MIDI THRU with type A midi minijacks as per MIDI standard. optional V/OCT and gate per voice expander also in the…

Fjol, from the project README
From the project README

Main components on the Fjol

741G17DBVL7805NCP1117-3.3_SOT2236N138LM4040DBZ-10TL072Teensy4.1PCM5100MCP6004PCA9622MCP6002

Fjol bill of materials (BOM)

204 components, 56 distinct parts.

QtyPartRefs
1
741G17DBV
IC1
2
L7805
U1, U5
2
NCP1117-3.3_SOT223
U2, U11
1
6N138
U3
1
LM4040DBZ-10
U4
1
TL072
U6
1
Teensy4.1
U7
1
PCM5100
U8
2
MCP6004
U9, U10
1
PCA9622
U12
1
MCP6002
U13
1
BC847
Q1
1
KUSBVX
X1
1
Conn_02x08_Odd_Even
J1
1
Conn_02x05_Odd_Even
J2
1
Conn_02x03_Counter_Clockwise
J3
1
Conn_01x18_Male
J5
1
Conn_01x10_Male
J6
1
Conn_01x16_Male
J7
1
Conn_01x16_Female
J8
Show 36 more
QtyPartRefs
1
Conn_01x18_Female
J9
1
Conn_01x10_Female
J10
8
50k-lin
ATTACK1, CTL2, PM1, PM2, RATIO1, RATIO2, RELEASE1, cutoff1
12
THONKICONNNEW
CV-CTL2, CV-CTL3, CV-CTL4, CV-PM1, CV-PM2, CV-RAT1, CV-RAT2, CV-REL1 +4
2
THONKI-STEREO
MIDI-IN1, MIDI-THRU1
2
SW_SPDT
SW1, SW2
1
ctl1
SW3
1
ctl2
SW4
4
Jumper_2_Bridged
demp1, flt1, fmt1, xsmt1
3
SW_MEC_5G
sw-midi1, sw-sel1, sw-sel2
2
STPS1L30U
D1, D2
1
1N4148
D3
1
LED
D4
8
LED_Dual_KAK
D5, D6, D7, D8, D9, D10, D11, D12
1
33u
L1
3
33u
L2, L6, L12
4
BLM21PG221SN1D
L3, L4, L5, L7
4
BLM21AG102SN1D
L8, L9, L10, L11
24
100n
C1, C3, C4, C11, C13, C15, C16, C17 +16
4
100u
C2, C5, C14, C44
3
22u
C6, C7, C10
10
1n
C8, C9, C32, C33, C34, C35, C38, C40 +2
2
10u
C21, C23
2
2.2u
C22, C24
2
100p
C30, C31
1
220
R1
7
1k
R2, R3, R5, R38, R41, R54, R55
1
470
R4
15
10k
R6, R9, R10, R39, R40, R42, R43, R82 +7
2
2.2k
R7, R8
10
200k
R11, R13, R15, R17, R23, R25, R26, R28 +2
11
100k
R12, R14, R16, R18, R24, R27, R29, R44 +3
10
66.5k
R19, R20, R21, R22, R31, R32, R33, R34 +2
16
100
R30, R35, R36, R37, R52, R53, R64, R65 +8
1
33
R50
1
10
R51

Fjol 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.

Fjol: common questions

What microcontroller does the Fjol use?

The Fjol is built around the Teensy4.1, from the NXP family.

How big is the Fjol PCB?

The Fjol measures 184.7 × 110.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fjol?

204 components, from 56 distinct parts. The full bill of materials is listed on this page.

Where can I download the Fjol design files?

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

Can I use the Fjol 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 Fjol 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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