Picoamp

sctanf·picoamp-PCB·indexspeakerdacdev/indexspeakerdac.kicad_pcb

About the Picoamp PCB

Picoamp is an open source RP2040/RP2350 PCB design by sctanf, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 11 × 29.2 mm, with 38 components from 21 distinct parts.

Its main chip is the SC0914(7), from the RP2040/RP2350 family. Other key parts include the MAX98360AEFB+T, W25Q16JVUXIQ TR and MIC5317-3.3YMT-TR. By type, the board carries 20 capacitors, 6 connectors, 6 resistors, 5 ICs and 1 crystal.

It belongs with the audio designs in this gallery.

From the project

compact usb-i2s dac using rp2040 and max98360a for powering speakers, like index bmr drivers

I forgot the silkscreen for usb pins, but they should be clear from below images. 0201 components suck to work with. * intended to use with a usb-c cable, however the CC wire needs 5.1K pull-down to ground which I forgot about

firmware for the device is at https://github.com/sctanf/picoamp-2

Main components on the Picoamp

MAX98360AEFB+T W25Q16JVUXIQ TR SC0914(7)MIC5317-3.3YMT-TR

Picoamp bill of materials (BOM)

38 components, 21 distinct parts.

Qty	Part	Footprint	Refs
2	MAX98360AEFB+T	MAX98360AEFB	IC1, IC2
1	W25Q16JVUXIQ TR W25Q16JVUXIQ_TR	SON50P300X200X60-9N	IC3
1	SC0914(7) RP2040	QFN-56-1EP_7x7mm_P0.4mm_EP3.2x3.2mm	U1
1	MIC5317-3.3YMT-TR MIC5317-3.3xM5	UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm	U2
1	ECS-120-10-33-AGM-TR Crystal_GND24	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	Conn_01x04_Pin	PinHeader_1x04_P2.00mm_Horizontal	J1
2	Conn_01x11_Pin	PinHeader_1x11_P2.00mm_Vertical	J2, J4
2	Conn_01x01_Pin	PinSocket_1x01_P2.00mm_Vertical	J3, J5
1	USB4510-03-1-A USB_C_Receptacle_USB2.0	USB-C_C168688	J6
2	GRM188C81A106MA73D 10uF	C_0603_1608Metric	C1, C2
2	GRM155R61A104KA01J 0.1uF	C_0402_1005Metric	C3, C4
2	GRM0335C1E150JA01D 15pF	C_0201_0603Metric	C5, C6
1	GRM033C80J104KE15D 1uF	C_0402_1005Metric	C7
1	GRM155C81A105KA12J 1uF	C_0402_1005Metric	C8
10	GRM033C80J104KE15D 100n	C_0201_0603Metric	C12, C14, C15, C17, C19, C20, C21, C22 +2
1	GRM033C80J104KE15D 1u	C_0402_1005Metric	C16
1	GRM155C81A105KA12J 1u	C_0402_1005Metric	C18
1	CRCW04021K00FKED 1K	R_0402_1005Metric	R1
2	RC0201FR-0727RL 27R	R_0201_0603Metric	R2, R3
1	CR0201-FW-1001GLF 1k	R_0201_0603Metric	R4

Show 1 more

Qty	Part	Footprint	Refs
2	RC0201JR-075K1L 5.1K	R_0201_0603Metric	R5, R6

Picoamp design files

The KiCad project lives in the sctanf/picoamp-PCB repository on GitHub; these links point at the commit this page was built from.

Layoutindexspeakerdacdev/indexspeakerdac.kicad_pcb
Schematicindexspeakerdacdev/indexspeakerdac.kicad_sch

Picoamp: common questions

What microcontroller does the Picoamp use?

The Picoamp is built around the SC0914(7), from the RP2040/RP2350 family.

How big is the Picoamp PCB?

The Picoamp measures 11 × 29.2 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Picoamp?

38 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Picoamp design files?

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

Can I use the Picoamp design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which sctanf chose for the repository.

Can I test firmware for the Picoamp 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.