4 layers98 × 75 mm
PiFinder4
brickbots/PiFinder
A plate solving telescope finder based around a Raspberry PI and RPI HQ Camera
157 parts257GPL-3.0
2 layers18 × 46 mm
Pt1-RevA2
electrolama/pt15pt1 brings several common hardware-debugging functions together on a compact USB-connected board. It provides extra USB ports, a serial interface, and software-switchable power for working with target devices.
- Size
- 18 × 46 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 29
- Pads
- 166
- Tracks, vias
- 422, 130
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 28 Aug 2026
- Updated
- 29 Aug 2026
Overview
Pt1-RevA2 is an open-source printed circuit board by electrolama, from the electrolama/pt1 repository on GitHub. It is a 2-layer board of 18 × 46 mm with 37 parts on 29 nets, routed with 422 tracks and 130 vias.
It is built around the CH343P, SL2.1A and RT9742CGJ5, with the SN74LVC1G57DBV and SRV05-4-P-T7 among its other parts. Its parts include 14 capacitors, 6 resistors, 4 ICs, 4 connectors and 3 diodes.
Main components
5
CH343P
TQFN-16-EP(3x3)-40℃~+85℃ 3.3V、5V 3mA 6Mbps 90uA USB 2.0 USB to UART TQFN-16-EP(3x3) USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
SL2.1A
SOP-160℃~+70℃ 120mA 2.5mA 4 4V~5.25V USB 2.0 USB Hub SOP-16 USB HUB Controllers ROHSCoreChipsUSB Converters
RT9742CGJ5
TSOT-23-5-40℃~+85℃ 1 2.7V~6V 2A 70mΩ Active High High Side Switch Short-Circuit Protection(SCP)、Undervoltage Protection(UVP)、Overcurrent Protection(OCP)、Over Temperature Protection TSOT-23-5 Power Distribution Switches ROHSRICHTEKPower Distribution Switches
SN74LVC1G57DBV
SOT-23-6-40℃~+125℃ 1 1.2V、1.9V、2.4V、3.8V 1.65V~5.5V 10uA 3 300mV、400mV、450mV、550mV 32mA 32mA 6.3ns@3.3V,50pF 74LVC Series Configurable Multi-Function Gate Overvoltage-tolerant input、Rear drive protection、Level shifting、Local shutdown mode、Live insertion protection SOT-23-6 Logic Gates ROHSTexas InstrumentsLogic GatesSRV05-4-P-T7
SOT-23-612V 1A@8/20us 3.5pF 500W@8/20us 5V 5uA 6V ESD Four channels IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSPROTEKESD And Surge Protection (TVS/ESD)
README
README.mdpt1
pt1 brings several common hardware-debugging functions together on a compact USB-connected board. It provides extra USB ports, a serial interface, and software-switchable power for working with target devices.
For an overview, documentation, and usage information, see the pt1 project documentation.
Companion software
Vicuña is Electrolama's browser-based serial monitor and terminal, with a dedicated pt1 mode for power control and fault monitoring.
License
Hardware source, including schematics, PCB design files, mechanical CAD, manufacturing files, and other source material required to make or modify the hardware, is licensed under the CERN Open Hardware Licence Version 2 — Weakly Reciprocal (CERN-OHL-W-2.0).
Parts
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 100n | _PKG_C_0402 | C2, C6, C9, C10, C14 |
| 4 | 10u | _PKG_C_0402 | C5, C11, C12, C13 |
| 4 | 47u | _PKG_C_1206 | C3, C4, C7, C8 |
| 2 | 100k | _PKG_R_0402 | R5, R6 |
| 2 | 5k1 | _PKG_R_0402 | R1, R2 |
| 2 | SRV05-4-P-T7 | SOT95P280X145-6N | D1, D2 |
| 2 | USB-C | USBC_C-31-M-12 | CON1, CON2 |
| 1 | SJ_2 | SJ1 | |
| 1 | 1X06_LOCK | J1 | |
| 1 | dummyfp1 | UNK_HOLE_1 | |
| 1 | dummyfp0 | UNK_HOLE_0 | |
| 1 | dummyfp2 | UNK_HOLE_2 | |
| 1 | 10n | _PKG_C_0402 | C1 |
| 1 | 12MHz | XTAL-4P-3225 | XT1 |
| 1 | 2k2 | _PKG_R_0402 | R4 |
| 1 | 510k | _PKG_R_0402 | R3 |
| 1 | CH343P | QFN16_L3.0-W3.0-P0.50-EP1.7 | IC1 |
| 1 | FB, 2A | _PKG_C_0805 | L1 |
| 1 | Green | _PKG_LED_0603 | LED1 |
| 1 | RT9742CGJ5 | _PKG_SOT23-5 | IC4 |
| 1 | SL2.1A | SOIC127P604X185-16N | IC2 |
| 1 | SN74LVC1G57DBV | SOT95P280X145-6N | IC3 |
| 1 | USB-A Female | JING_912-121A2023S10100 | CON3 |
Questions
How big is the Pt1-RevA2 PCB?
It measures 18 × 46 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Pt1-RevA2 use?
37 parts, built around the CH343P, SL2.1A, RT9742CGJ5 and SN74LVC1G57DBV. 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 Pt1-RevA2 KiCad files?
From the electrolama/pt1 repository on GitHub, at the commit this page was made from: the board is pcba/Rev A2/pt1-RevA2.kicad_pcb and its schematic pcba/Rev A2/pt1-RevA2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Pt1-RevA2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask electrolama before reusing the design.
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