HardLabs

Iosefka motherboard

GlobalSequence·iosefka·hardware/iosefka_motherboard/iosefka_motherboard.kicad_pcb

Iosefka motherboard PCB layout, top view — open source RP2040/RP2350 board by GlobalSequence
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About the Iosefka motherboard PCB

Iosefka motherboard is an open source RP2040/RP2350 PCB design by GlobalSequence, published on GitHub. It is a 2-layer board measuring 213 × 128.5 mm, with 122 components from 49 distinct parts.

Its main chip is the Raspberry Pi Pico, from the RP2040/RP2350 family. Other key parts include the LM7805_TO220, LM7905_TO220, LT1054, SSI2140 and 24LC256. By type, the board carries 51 resistors, 41 capacitors, 12 ICs, 9 connectors, 4 diodes and 2 transistors.

It belongs with the audio designs in this gallery.

From the project

hybrid digital analog synthesizer

Iosefka is a hybrid digital analog monophonic synthesizer consisting of the following parts:

- 2x wavetable oscillators, capable of interpolated morphing waveforms in the X and Y dimension along 256 hand-picked waveforms in a 16x16 layout - White noise generator - Sample-rate reduction and Bit-rate reduction effects - Loopback digital delay fed from VCA output with feedback and adjustable rate from >3 ms to ~683 ms

Iosefka motherboard, from the project README
From the project README

Main components on the Iosefka motherboard

LM7805_TO220LM7905_TO220LT1054SSI214024LC256Raspberry Pi PicoMCP3201MCP4822CD4051BTL074LM13700

Iosefka motherboard bill of materials (BOM)

122 components, 49 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LM7805_TO220
U1
1
LM7905_TO220
U2
1
LT1054
U3
1
SSI2140
U4
1
24LC256
U5
1
Raspberry Pi Pico
U6
1
MCP3201
U7
1
MCP4822
U8
1
CD4051B
U9
2
TL074
U11, U12
1
LM13700
U14
2
2N3906
Q1, Q2
1
Audio Out
J1
1
DC In
J2
1
Audio In
J3
4
CONN_01X10
Conn_01x10
J4, J5, J6, J9
2
CONN_01X08
Conn_01x08
J7, J8
1
10k Offset
RV1
1
100K
A100k
RV2
1
10k Tracking
RV3
Show 29 more
QtyPartRefs
3
BAT85
D1, D4, D5
1
1N4001
D3
3
100U
100u
C1, C16, C20
2
220U
220u
C2, C17
17
100N
100n
C3, C5, C6, C7, C10, C11, C12, C18 +9
1
10P
10p
C4
5
4.7u NP
C8, C15, C25, C30, C36
1
4.7U
4.7u
C9
3
100P
100p
C13, C14, C44
1
10U
10u
C19
4
680P
680p
C21, C22, C23, C24
1
47N
47n
C26
2
4.7N
4.7n
C27, C43
1
470P
470p
C42
12
15K
15k
R1, R2, R4, R5, R7, R8, R10, R11 +4
5
470R
R3, R6, R9, R12, R32
7
10K
10k
R13, R41, R44, R45, R48, R49, R57
2
7.5K
7.5k
R14, R36
1
220K
220k
R15
3
20K
20k
R16, R46, R55
3
2.2K
2.2k
R18, R24, R28
2
100K
100k
R19, R22
7
30K
30k
R21, R23, R33, R34, R38, R39, R47
2
12K
12k
R25, R29
1
DNP
R27
2
1k
R30, R31
1
47K
47k
R42
2
4.7K
4.7k
R50, R51
1
5.1K
5.1k
R56

Iosefka motherboard design files

The KiCad project lives in the GlobalSequence/iosefka repository on GitHub; these links point at the commit this page was built from.

Iosefka motherboard: common questions

What microcontroller does the Iosefka motherboard use?

The Iosefka motherboard is built around the Raspberry Pi Pico, from the RP2040/RP2350 family.

How big is the Iosefka motherboard PCB?

The Iosefka motherboard measures 213 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Iosefka motherboard?

122 components, from 49 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Iosefka motherboard design files?

From the GlobalSequence/iosefka repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Iosefka motherboard design in my own project?

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

Can I test firmware for the Iosefka motherboard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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