2 layers34.5 × 34.5 mm Source splitter, the printed circuit board in 3D

Source splitter

Repository for the storage and dissemination of NN22 technical documents

Size: 34.5 × 34.5 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 3
Nets: 18
Pads: 58
Tracks, vias: 89, 24
Pours: 1
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 12 Feb 2024
Updated: 18 Feb 2025

Overview

Source splitter is an open-source printed circuit board by BUNPC, from the BUNPC/NN22-Technical-Documents repository on GitHub. It is a 2-layer board of 34.5 × 34.5 mm with 3 parts on 18 nets, routed with 89 tracks and 24 vias.

README

Hardware Main/Electronics/Detector Electronics/DET_Splitter/README.md

readout-splitter

This is a splitter board designed to be plug-compatible with the TIGRIS one. See top-level README for some more details.

Connector from readout system is a Samtec SHF-117-01-L-D-SM shrouded 34-pin header with 0.05" pitch.

Detector connector is Samtec SFMC-118-02-S-D 36-pin socket strip with 0.05" pitch. Note that the TIGRIS schematic and layout use mirrored pinout for the detector connector (odd-even swap).

Designed LDOs:

Negative: ADP7182ACPZN-R7
Positive: ADP7142ACPZN5.0-R7

The negative adjustable regulator should output -15.0V with the resistors shown. There is an additional filter in the design (R+C on front side) which can (according to the datasheet) reduce the noise a bit in the negative regulator. There is no such provision for the positive regulator.

This is a 4-layer board and a bit dense. There were a few compromises made in routing with shared vias, etc but hopefully it will be OK.

Parts

Qty	Value	Footprint	References
1	Conn_02x13_Odd_Even	models:SAMTEC_SHF-113-01-L-D-SM	J1
1	Conn_02x16_Odd_Even	my_samtec_swap:SAMTEC_SFMC-116-02-S-D_swap12	J2
1	Housing	AA_Hammond:1551QGY	N1

Questions

How big is the Source splitter PCB?

It measures 34.5 × 34.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Source splitter use?

3 parts. 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 Source splitter KiCad files?

From the BUNPC/NN22-Technical-Documents repository on GitHub, at the commit this page was made from: the board is Hardware Main/Electronics/Source Electronics/SRC_Splitter/source-splitter.kicad_pcb and its schematic Hardware Main/Electronics/Detector Electronics/DET_Optode/flex-VEMD/flex-VEMD.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Source splitter design in my own project?

Its repository states no licence, so its author keeps all rights: ask BUNPC before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/bunpc-nn22-technical-documents-source-splitter" title="Source splitter in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/bunpc-nn22-technical-documents-source-splitter.jpg" alt="Source splitter" width="1200" height="900">

A picture that opens the board, for a README

[![Source splitter](https://pcbkit.io/embed/boards/bunpc-nn22-technical-documents-source-splitter.jpg?size=s)](https://pcbkit.io/boards/bunpc-nn22-technical-documents-source-splitter)

Source

Repository: BUNPC/NN22-Technical-Documents
Board file: Hardware Main/Electronics/Source Electronics/SRC_Splitter/source-splitter.kicad_pcb
Commit: 4c484d3
Licence: Not stated

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