HardLabs

Sycamore

tpcarlson·synth-diy·sycamore/sycamore.kicad_pcb

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

About the Sycamore PCB

Sycamore is an open source RP2040/RP2350 PCB design by tpcarlson, published on GitHub. It is a 2-layer board measuring 60.1 × 128.5 mm, with 145 components from 40 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the MCP6002-xSN, LM1117DT-5.0, MCP3208, LM4040LP-3.3 and HDSP-7501. By type, the board carries 57 resistors, 22 capacitors, 16 diodes, 15 ICs, 12 connectors and 9 transistors.

It belongs with the audio designs in this gallery.

From the project

Mostly Eurorack projects

Sycamore is a looping quantized sequencer with up to 64 steps, and up to 100 scales. Sycamore allows for CV control over many of its internal parameters including the loop length, range, and note range in a scale to be quantized to.

Some advanced features are accessible through a one-layer menu to allow for more deep tweaking of harmonies, delay, and scale quantization - however, Sycamore is perfectly usable without touching these at all!

Sycamore, from the project README
From the project README

Main components on the Sycamore

PicoMCP6002-xSNLM1117DT-5.0MCP3208LM4040LP-3.3HDSP-7501OPA171LM4040LP-5LM4040LP-10PCA9685PW

Sycamore bill of materials (BOM)

145 components, 40 distinct parts.

QtyPartRefs
1
Pico
U1
3
MCP6002-xSN
U2, U14, U16
1
LM1117DT-5.0
U3
1
MCP3208
U4
1
LM4040LP-3.3
U5
1
~
U6
2
HDSP-7501
U7, U8
2
OPA171
U9, U10
1
LM4040LP-5
U11
1
LM4040LP-10
U15
1
PCA9685PW
U17
9
MMBT3904
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +1
1
Conn_02x05_Odd_Even
J1
1
Conn_01x03
J2
9
AudioJack2
J3, J4, J5, J6, J7, J8, J9, J10 +1
1
AudioJack2_SwitchT
J12
4
10k
RV1, RV2, RV3, RV4
1
RotaryEncoder_Switch
SW1
1
SW_MEC_5E
SW2
3
LP4OA1PBCT
SW3, SW4, SW5
Show 20 more
QtyPartRefs
3
TestPoint
TP1, TP2, TP3
2
D_Schottky
D1, D2
8
ESD
D3, D4, D5, D12, D13, D14, D15, D16
3
1N4148
D6, D7, D8
3
LED
D9, D10, D11
2
FerriteBead_Small
FB1, FB2
5
47u
C1, C2, C3, C7, C15
7
100n
C4, C6, C8, C11, C12, C13, C26
1
100n
C5
1
1U
C9
3
470n
C10, C14, C16
5
4.7n
C17, C18, C19, C20, C21
3
200R
R1, R2, R3
11
100k
R4, R6, R8, R14, R18, R20, R23, R25 +3
10
10k
R5, R7, R9, R32, R50, R52, R55, R56 +2
2
2.2k
R10, R31
5
200k
R15, R17, R21, R24, R29
1
64.9k
R16
4
33k
R19, R22, R27, R28
21
100R
R26, R30, R33, R34, R35, R36, R37, R38 +13

Sycamore 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.

Sycamore: common questions

What microcontroller does the Sycamore use?

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

How big is the Sycamore PCB?

The Sycamore measures 60.1 × 128.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Sycamore?

145 components, from 40 distinct parts. The full bill of materials is listed on this page.

Where can I download the Sycamore 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 Sycamore 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 Sycamore 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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