HardLabs

Acid Synth

lonesoulsurfer·Acid_Drip_Bassline_and_Drum_Synth·Acid_Drip_PCB_Kicad/Acid_Synth.kicad_pcb

Acid Synth PCB layout, top view — open source RP2040/RP2350 board by lonesoulsurfer

About the Acid Synth PCB

Acid Synth is an open source RP2040/RP2350 PCB design by lonesoulsurfer, published on GitHub. It is a 2-layer board measuring 169 × 114.5 mm, with 33 components from 13 distinct parts.

Its main chip is the RaspberryPi_Pico, from the RP2040/RP2350 family. Other key parts include the TFT_2.8IN_ILI9341. By type, the board carries 18 switches, 8 capacitors, 3 connectors, 2 resistors, 1 IC and 1 module.

It belongs with the audio designs in this gallery.

From the project

All in one acid bassline and groove box - run off a Raspberry Pi

Youtube Video (click the image) - [](https://youtu.be/anotb2mvv04)

An RP2040-based acid bassline synthesizer and drum machine built on the Mozzi audio library. Three instruments in one device: a 16-step acid sequencer, a second synth voice called DRIFT, and a 16-pattern drum groove box, all running simultaneously on dual cores with a 320x240 ILI9341 TFT display and 16 Cherry MX pads.

Acid Synth, from the project README
From the project README

Main components on the Acid Synth

TFT_2.8IN_ILI9341RaspberryPi_Pico

Acid Synth bill of materials (BOM)

33 components, 13 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TFT_2.8IN_ILI9341
TFT_2.8in_ILI9341
U1
1
RaspberryPi_Pico
A1
1
Sync_In
J1
1
Output
J2
1
CONN_01X02_SOCKET
Conn_01x02_Socket
J3
16
~
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +8
2
SW_SPDT
SW17, SW18
3
100NF
100nf
C1, C2, C4
3
100UF
100uf
C3, C5, C6
1
10NF
10nf
C7
1
1000UF
1000uf
C9
1
3.3K
R1
1
10K
R3

Acid Synth design files

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

Acid Synth: common questions

What microcontroller does the Acid Synth use?

The Acid Synth is built around the RaspberryPi_Pico, from the RP2040/RP2350 family.

How big is the Acid Synth PCB?

The Acid Synth measures 169 × 114.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Acid Synth?

33 components, from 13 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 Acid Synth design files?

From the lonesoulsurfer/Acid_Drip_Bassline_and_Drum_Synth 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 Acid Synth design in my own project?

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

Can I test firmware for the Acid Synth 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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