Synthetizer

ImMagni·Synthetizer·PCB/TecladoMidi.kicad_pcb

About the Synthetizer PCB

Synthetizer is an open source RP2040/RP2350 PCB design by ImMagni, published on GitHub under the MIT license. It is a 2-layer board measuring 406 × 90 mm, with 106 components from 17 distinct parts.

Its main chip is the Orpheus_Pico, from the RP2040/RP2350 family. Other key parts include the PCM5100, LM4810 and PAM8403. By type, the board carries 41 diodes, 36 switches, 13 capacitors, 6 connectors, 3 ICs and 2 resistors.

It belongs with the audio designs in this gallery.

From the project

Synthesizer made of pcm5000 lm4810 pam8403

This project is a digital synthesizer keyboard capable of generating audio internally or outputting MIDI over USB. It features a screen-based user interface controlled through a rotary encoder and directional buttons. ## Features - Volume control from the screen using a rotary encoder - Selectable output modes: MIDI, Speakers, or Line output - Three-octave keyboard - Multiple waveform generation modes for audio - Settings saves on memory - On-screen menu system with directional navigation - LCD feedback for current settings ## BOM - 1× Orpheus_Pico (Raspberry Pi Pico) - 5× Capacitor 1 µF - 4×…

Main components on the Synthetizer

PCM5100 LM4810 PAM8403 Orpheus_Pico

Synthetizer bill of materials (BOM)

106 components, 17 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	PCM5100	TSSOP-20_4.4x6.5mm_P0.65mm	U1
1	LM4810	TSSOP-8_3x3mm_P0.65mm	U2
1	PAM8403	SOP-16	U4
1	Orpheus_Pico	RaspberryPi_Pico_Common_Unspecified	A1
1	ST7735R LCD	PinHeader_1x08_P2.54mm_Vertical	J1
1	AudioJack4_SwitchT1	Jack_3.5mm_PJ31060-I_Horizontal	J2
2	+	SolderWirePad_1x01_SMD_5x10mm	J3, J4
2	-	SolderWirePad_1x01_SMD_5x10mm	J8, J9
36	SW_Push	SW_Cherry_MX_1.00u_PCB	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +28
4	SW_Push	SW_Cherry_MX_1.00u_PCB	SWDN1, SWL1, SWR1, SWUP1
41	1N4148	D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2, D3, D4, D5, D6, D7, D8 +33
5	1u	C_Radial_D5.0mm_H5.0mm_P2.00mm	C1, C2, C3, C4, C13
4	4.7u	C_Radial_D5.0mm_H5.0mm_P2.00mm	C5, C6, C8, C11
1	0.1u	C_Radial_D5.0mm_H5.0mm_P2.00mm	C7
1	0.1u	C_Disc_D5.0mm_W2.5mm_P2.50mm	C9
2	10u	C_Radial_D5.0mm_H5.0mm_P2.00mm	C10, C12
2	10k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R2

Synthetizer design files

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

Synthetizer: common questions

What microcontroller does the Synthetizer use?

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

How big is the Synthetizer PCB?

The Synthetizer measures 406 × 90 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Synthetizer?

106 components, from 17 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 Synthetizer design files?

From the ImMagni/Synthetizer 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 Synthetizer design in my own project?

Yes, under the terms of its MIT license, which ImMagni chose for the repository.

Can I test firmware for the Synthetizer 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.