HardLabs

Board B

szegedylorant·wavetable-vco·wavetable-hardware_pcb_2/board_B.kicad_pcb

Board B layout, top view — open source RP2040/RP2350 board by szegedylorant

About the Board B

Board B is an open source RP2040/RP2350 PCB design by szegedylorant, published on GitHub. It is a 2-layer board measuring 38.1 × 100 mm, with 68 components from 32 distinct parts.

Its main chip is the XIAO-RP2040, from the RP2040/RP2350 family. Other key parts include the TL072, MCP6004, LM4040LP-5 and LM7805_TO220. By type, the board carries 24 resistors, 22 capacitors, 10 test points, 6 ICs, 4 connectors and 2 inductors.

From the project

Arduino(-pico) code for wavetable VCO on Seeed XIAO RP2040 board

Wavetable VCO in 8hp Eurorack format based on the Seeed XIAO RP2040 board

* Chose from 8 wavetable types via push button

* Move around wavetable via potentiometer

Set root note / transpose via potentiometer Fine tuning via same knob while pressing tune button

* Octave switch for -1 / 0 / +1 octaves on sub out

* V / Oct tracking on 5 octaves (0V - 5V)

* CV (-5V - +5V) for wavetable modulation with attenuator

Board B, from the project README
From the project README

Main components on the Board B

XIAO-RP2040TL072MCP6004LM4040LP-5LM7805_TO220

Board B bill of materials (BOM)

68 components, 32 distinct parts.

QtyPartRefs
1
XIAO-RP2040
U1
2
TL072
U2, U5
1
MCP6004
U3
1
LM4040LP-5
U4
1
LM7805_TO220
U6
1
EuroPower10_THT
J1
1
Conn_01x07_Socket
J7
1
Conn_01x08_Socket
J8
1
Conn_01x04_Socket
J10
1
+12V
TP1
1
-12V
TP2
1
+5V
TP3
1
-5V
TP4
1
+3V3
TP5
1
aout
TP6
1
sout
TP7
1
modin
TP8
1
voctin
TP9
1
wtin
TP10
2
FerriteBead
FB1, FB2
Show 12 more
QtyPartRefs
4
22n
C1, C2, C14, C15
2
1u
C3, C18
3
10u
C4, C5, C6
1
1u
C7
9
100nF
C8, C9, C10, C11, C17, C19, C21, C22 +1
3
1n
C12, C13, C20
4
330
R1, R2, R22, R23
7
33k
R3, R10, R14, R17, R18, R20, R35
8
100k
R4, R8, R12, R15, R19, R25, R33, R34
1
470
R9
2
10k
R16, R26
2
20k
R21, R27

Board B design files

The KiCad project lives in the szegedylorant/wavetable-vco repository on GitHub; these links point at the commit this page was built from.

Board B: common questions

What microcontroller does the Board B use?

The Board B is built around the XIAO-RP2040, from the RP2040/RP2350 family.

How big is the Board B?

The Board B measures 38.1 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Board B?

68 components, from 32 distinct parts. The full bill of materials is listed on this page.

Where can I download the Board B design files?

From the szegedylorant/wavetable-vco repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Board B design in my own project?

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

Can I test firmware for the Board B 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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