2 layers114.9 × 76 mm
Protected power entry
absmach/synth
Open-source circuit compiler for engineers and AI agents
84 parts29Apache-2.0
4 layers71 × 34 mm
Buck
absmach/synth29Open-source circuit compiler for engineers and AI agents
- Size
- 71 × 34 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 13
- Pads
- 65
- Tracks, vias
- 97, 21
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Sep 2026
- Updated
- 6 Nov 2026
Overview
Buck is an open-source printed circuit board by absmach, from the absmach/synth repository on GitHub, published under the Apache-2.0 licence. It is a 4-layer board of 71 × 34 mm with 27 parts on 13 nets, routed with 97 tracks and 21 vias.
It is built around the M2.5, B2B-XH-A and B4B-XH-A, with the RVT1H470M0810, SRN6045TA-6R8M and LTST-C190KGKT among its other parts. Its parts include 8 capacitors, 4 diodes, 2 connectors, 1 IC and 1 inductor. It belongs with the power boards of this library.
Main components
8M2.5
-0.45mm 2.5mm 2mm 5mm DIN934 Hex M2.5X0.45 Nickel plated Silver white - Hexagonal nutsShuntianHex Nut
B2B-XH-A
插件,P=2.5mm-25℃~+85℃ 1 1x2P 2 2.5mm 250V 2P 3A 5.75mm 7.4mm 7mm Brass K Pin PA66 Through Hole Tin UL94V-0 White XH 插件,P=2.5mm Wire To Board Connector ROHSJSTWire To Board Connector
B4B-XH-A
插件,P=2.5mm,4PUncategorisedJST
RVT1H470M0810
SMD,D8xL10.2mm-55℃~+105℃ 10.2mm 47uF 50V 8mm ±20% SMD,D8xL10.2mm Aluminum Electrolytic Capacitors - SMD ROHSHonor ElecAluminum Electrolytic Capacitors - SMD
SRN6045TA-6R8M
SMD,6x6mm3.6A 34mΩ 5.7A 6.8uH ±20% SMD,6x6mm Power Inductors ROHSBournsPower Inductors
LTST-C190KGKT
0603-30℃~+85℃ 130° 20mA 2V 35mcd 567.5nm~576.5nm 574nm 75mW Discrete Diode Water Clear Yellow Green 0603 LED Indication - Discrete ROHSLite-OnLED Indication - Discrete
SMBJ30A
DO-214AA(SMB)ESD And Surge Protection (TVS/ESD)hongjiacheng
SS36
SMA(DO-214AC)-55℃~+125℃ 3A 500uA@60V 60V 700mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
README
examples/rp2350/README.mdRP2350 routed example
Latest regenerated run
The full-board reconstruction routes with the installed FreeRouting pipeline
on six layers. Local generated artifacts are under
reproductions/rp2350-reconstructed/generated/:
rp2350_devboard_reconstructed.synth— reconstructed Synth sourcerp2350_devboard_reconstructed.layout.toml— recovered placement sidecarrp2350_devboard_freerouted_6layer.kicad_pcb— routed KiCad boardrp2350_devboard_freerouted_6layer.png— rendered review imagefreerouted-6layer-drc.rpt— native KiCad DRC report
FreeRouting completed with 0 unrouted signal nets. The DRC report still contains 14 ground-zone island items and two footprint-library warnings; this is not production sign-off until those items are reviewed.
rp2350_devboard_freerouting_clean.kicad_pcb is a pre-generated compact KiCad
review artifact.
Reference dimensions: approximately 84.5 × 73.1 mm.
Open the KiCad board for an interactive review.
The companion DRC report records the current review state. The authoritative KiCad check currently reports 80 DRC violations and 18 unconnected items. The 18 unconnected entries are zone-to-zone ground-island reports, not ordinary signal-pad pairs, but they are still violations. This is an example and review fixture, not production sign-off; silkscreen and footprint library warnings also require engineering review.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100k | Resistor_SMD:R_0603_1608Metric | R_FB_T, R_PG, R_UV_B |
| 3 | 22uF | Capacitor_SMD:C_1206_3216Metric | C5, C6, C9 |
| 2 | 470 | Resistor_SMD:R_0603_1608Metric | R_LED, R_PGLED |
| 2 | M2.5 | MountingHole:MountingHole_2.5mm | H1, H2 |
| 1 | 1.1A_PTC | Fuse:Fuse_1812_4532Metric | F1 |
| 1 | 1.37M | Resistor_SMD:R_0603_1608Metric | R_UV_T |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 10uF | Capacitor_SMD:C_1206_3216Metric | C2 |
| 1 | 220nF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 24V_IN | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | J1 |
| 1 | 33k | Resistor_SMD:R_0603_1608Metric | R_RT |
| 1 | 3V3_OUT | Connector_JST:JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J2 |
| 1 | 43.2k | Resistor_SMD:R_0603_1608Metric | R_FB_B |
| 1 | 47uF | Capacitor_SMD:CP_Elec_8x10 | C1 |
| 1 | 56pF | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 6.8uH | Inductor_SMD:L_Bourns_SRN6045TA | L1 |
| 1 | LMR38010SDDAR | Package_SO:HSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.1mm | U1 |
| 1 | PG FAULT | LED_SMD:LED_0603_1608Metric | D4 |
| 1 | PWR | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | SMBJ30A | Diode_SMD:D_SMB | D2 |
| 1 | SS36 | Diode_SMD:D_SMC | D1 |
Questions
How big is the Buck PCB?
It measures 71 × 34 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Buck use?
27 parts, built around the M2.5, B2B-XH-A, B4B-XH-A and RVT1H470M0810. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Buck KiCad files?
From the absmach/synth repository on GitHub, at the commit this page was made from: the board is qualification/class-b/buck/kicad/buck.kicad_pcb and its schematic qualification/class-a/i2c-sensor-node/export/i2c_sensor_node.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Buck design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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