ESR-System

sandeepzgk·ESR-System·PCB/sr-device.kicad_pcb

About the ESR-System PCB

ESR-System is an open source RP2040/RP2350 PCB design by sandeepzgk, published on GitHub under the MIT license. It is a 2-layer board measuring 80 × 70 mm, with 86 components from 32 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the LM7812S-TR, PCM5100APWR, LM78M05CDTX/NOPB, AP7333-33SRG-7 and TPA3112D1PWPR. By type, the board carries 42 capacitors, 21 resistors, 6 ICs, 6 inductors, 5 diodes and 3 connectors.

It belongs with the audio designs in this gallery.

From the project

Notable parts - DAC: PCM5100A - Amplifier: TPA3112D1 - Regulators: LM78M05C, LM7812S, LM1085IS-12, AP7333-33 - Inductors/caps/resistors; Pico headers/footprints; custom logos

Generate fabrication - Use KiCad’s Plot and Fabrication Toolkit (options in fabrication-toolkit-options.json) - Export Gerbers, drill files, position files, and BOM as needed

JLC integration workflow - jlcimporter.py wraps JLC2KiCadLib to create per‑part libraries under PCB/lib// - It normalizes filenames (symbol.kicadsym, footprint.kicadmod, model.step) and updates lib tables - Run from PCB/: python jlcimporter.py…

Main components on the ESR-System

PicoLM7812S-TRPCM5100APWR LM78M05CDTX/NOPB AP7333-33SRG-7TPA3112D1PWPR

ESR-System bill of materials (BOM)

86 components, 32 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	DNP Pico	RPi_Pico_SMD_TH	U1
1	LM7812S-TR	footprint	U2
1	PCM5100APWR	TSSOP-20_4.4x6.5mm_P0.65mm	U3
1	LM78M05CDTX/NOPB	footprint	U8
1	AP7333-33SRG-7	footprint	U9
1	TPA3112D1PWPR	footprint	U11
2	KF301-5_0-2P	footprint	J1, J2
1	Conn_01x02_Pin	PinHeader_1x02_P2.54mm_Vertical	J3
1	C719176 10K	footprint	RV1
1	PTS636SK25SMTRLFS	footprint	SW1
1	SS-12D11L7	SS-12D11L7	SW2
5	C89811 LED_Small	LED_0603_1608Metric	D1, D2, D3, D4, D5
2	80Ω	L_0805_2012Metric	FB1, FB3
2	75Ω	L_1806_4516Metric	FB2, FB4
2	22UH 22uH	footprint	L1, L2
2	2.2NF 2.2uF	C_0603_1608Metric	C1, C4
2	2.2NF 2.2nF	C_0603_1608Metric	C2, C3
11	100NF 100nF	C_0603_1608Metric	C5, C8, C9, C11, C14, C15, C16, C17 +3
9	1UF 1uF	C_0603_1608Metric	C6, C13, C20, C21, C29, C30, C31, C32 +1
4	10UF 10uF	C_0603_1608Metric	C7, C10, C12, C22

Show 12 more

Qty	Part	Footprint	Refs
1	0.22UF 0.22uF	C_0603_1608Metric	C18
4	1NF 1nF	C_0603_1608Metric	C23, C26, C34, C36
2	100UF 100uF	CP_Elec_6.3x5.4	C25, C28
2	0.68UF 0.68uF	C_0603_1608Metric	C35, C37
2	0.47UF 0.47uF	C_0603_1608Metric	C38, C39
2	1UF 1nF	C_0603_1608Metric	C40, C41
1	68UF 68uF	footprint	C43
3	56R	R_0603_1608Metric	R1, R2, R3
8	10K	R_0603_1608Metric	R4, R7, R15, R16, R17, R18, R19, R20
2	470R	R_0603_1608Metric	R5, R6
5	1K	R_0603_1608Metric	R11, R12, R13, R14, R21
3	10R	R_0603_1608Metric	R22, R23, R24

ESR-System design files

The KiCad project lives in the sandeepzgk/ESR-System repository on GitHub; these links point at the commit this page was built from.

ESR-System: common questions

What microcontroller does the ESR-System use?

The ESR-System is built around the Pico, from the RP2040/RP2350 family.

How big is the ESR-System PCB?

The ESR-System measures 80 × 70 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ESR-System?

86 components, from 32 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 ESR-System design files?

From the sandeepzgk/ESR-System 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 ESR-System design in my own project?

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

Can I test firmware for the ESR-System 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.