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Fjol top

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

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

Fjol top is an open source PCB design by hallmar, published on GitHub. It is a 2-layer board measuring 91.3 × 110.7 mm, with 134 components from 31 distinct parts.

Other key parts include the L7805, MCP6004, PCA9622 and MCP6002. By type, the board carries 61 resistors, 21 capacitors, 9 diodes, 6 switches, 5 ICs and 5 inductors.

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 top, from the project README
From the project README

Main components on the Fjol top

L7805MCP6004PCA9622MCP6002

Fjol top bill of materials (BOM)

134 components, 31 distinct parts.

QtyPartRefs
1
L7805
U5
2
MCP6004
U9, U10
1
PCA9622
U12
1
MCP6002
U13
1
BC847
Q1
1
KUSBVX
X1
1
Conn_01x18_Male
J5
1
Conn_01x10_Male
J6
1
Conn_01x16_Male
J7
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
1
SW_SPDT
SW2
1
ctl1
SW3
1
ctl2
SW4
3
SW_MEC_5G
sw-midi1, sw-sel1, sw-sel2
1
LED
D4
8
LED_Dual_KAK
D5, D6, D7, D8, D9, D10, D11, D12
1
BLM21PG221SN1D
L7
4
BLM21AG102SN1D
L8, L9, L10, L11
Show 11 more
QtyPartRefs
10
1n
C8, C9, C32, C33, C34, C35, C38, C40 +2
10
100n
C11, C18, C36, C37, C39, C43, C45, C46 +2
1
100u
C14
5
1k
R5, R38, R41, R54, R55
10
200k
R11, R13, R15, R17, R23, R25, R26, R28 +2
9
100k
R12, R14, R16, R18, R24, R27, R29, R67 +1
10
66.5k
R19, R20, R21, R22, R31, R32, R33, R34 +2
16
100
R30, R35, R36, R37, R52, R53, R64, R65 +8
9
10k
R40, R82, R83, R84, R85, R86, R87, R88 +1
1
33
R50
1
10
R51

Fjol top 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 top: common questions

How big is the Fjol top PCB?

The Fjol top measures 91.3 × 110.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Fjol top?

134 components, from 31 distinct parts. The full bill of materials is listed on this page.

Where can I download the Fjol top 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 top 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.

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