HardLabs

Oak

tpcarlson·synth-diy·oak/oak.kicad_pcb

Oak PCB layout, top view — open source RP2040/RP2350 board by tpcarlson

About the Oak PCB

Oak is an open source RP2040/RP2350 PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 35 × 128.5 mm, with 99 components from 34 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the 74AHCT1G125, NCP1117-3.3_SOT223, W25Q32JVSS and NCP1117-5.0_SOT223. By type, the board carries 33 resistors, 19 capacitors, 11 transistors, 11 connectors, 9 diodes and 7 ICs.

It belongs with the audio designs in this gallery.

From the project

Mostly Eurorack projects

Oak is an expander for the looping, quantized sequencer Sycamore. Oak includes some controls to extend Sycamore's functionality, giving a little tighter control over the loop along with some additional useful outputs.

As measured by the joranalogue Test 3, at the very most 50 mA on +12v. The -12v and 5v rails are unused. When idle, around 25-40mA.

While Sycamore's overall design primarily draws from the Mutable Instruments cancelled projects page, Oak is entirely my own invention.

Oak, from the project README
From the project README

Main components on the Oak

74AHCT1G125NCP1117-3.3_SOT223W25Q32JVSSRP2040NCP1117-5.0_SOT223

Oak bill of materials (BOM)

99 components, 34 distinct parts.

QtyPartRefs
3
74AHCT1G125
U13, U18, U19
1
NCP1117-3.3_SOT223
U20
1
W25Q32JVSS
U21
1
RP2040
U22
1
NCP1117-5.0_SOT223
U23
11
MMBT3904
Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17 +3
1
ABM8-272-T3
Y1
1
Conn_02x05_Odd_Even
J13
2
Conn_01x03
J14, J15
6
AudioJack2
J16, J17, J18, J21, J22, J23
1
Conn_01x02
J19
1
USB_C_Receptacle_USB2.0_16P
J24
4
LP4OA1PBCT
SW6, SW7, SW8, SW9
2
SW_MEC_5E
SW10, SW11
1
SW_Push
SW12
1
D_Schottky
D17
1
LED
D18
3
1N4148
D23, D24, D25
4
LED
D26, D27, D28, D29
1
FerriteBead_Small
FB4
Show 14 more
QtyPartRefs
1
47u
C22
5
10u
C23, C24, C30, C31, C44
2
15p
C28, C29
9
100n
C33, C34, C36, C38, C39, C40, C41, C42 +1
2
1u
C35, C37
11
100k
R11, R13, R59, R64, R66, R68, R70, R80 +3
8
200R
R12, R54, R63, R65, R81, R83, R85, R87
3
10k
R67, R69, R71
3
1k
R72, R73, R74
2
1k
R75, R77
1
DNF
R76
2
27
R78, R79
2
5.1k
R88, R89
1
220R
R90

Oak design files

The KiCad project lives in the tpcarlson/synth-diy repository on GitHub; these links point at the commit this page was built from.

Oak: common questions

What microcontroller does the Oak use?

The Oak is built around the RP2040, from the RP2040/RP2350 family.

How big is the Oak PCB?

The Oak measures 35 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Oak?

99 components, from 34 distinct parts. The full bill of materials is listed on this page.

Where can I download the Oak design files?

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

Can I use the Oak design in my own project?

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

Can I test firmware for the Oak 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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