2 layers360 × 3.8 mm Flex VEMD, the printed circuit board in 3D

Flex VEMD

Repository for the storage and dissemination of NN22 technical documents

Size: 360 × 3.8 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 4
Nets: 6
Pads: 17
Tracks, vias: 35, 8
Pours: 2
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 12 Feb 2024
Updated: 18 Feb 2025

Overview

Flex VEMD 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 360 × 3.8 mm with 4 parts on 6 nets, routed with 35 tracks and 8 vias.

It is built around the VEMD5160X01. Its parts include 1 capacitor, 1 IC, 1 diode and 1 connector.

Main components

VEMD5160X01
TDFN-4-EPPhotodiodesVishay Intertechnology

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	0.1uF	Capacitor_SMD:C_0402_1005Metric	C1
1	ADPD2210	my_lfcsp:LFCSP-6-2x2mm	U1
1	Conn_02x02_Odd_Even	my_header:PinHeader_2x02_P1.27mm_compact	J1
1	VEMD5160X01	my_photodiode:VEMD-4-4.1x5.2mm	D1

Questions

How big is the Flex VEMD PCB?

It measures 360 × 3.8 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Flex VEMD use?

4 parts, built around the VEMD5160X01. 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 Flex VEMD 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/Detector Electronics/DET_Optode/flex-VEMD/flex-VEMD.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 Flex VEMD 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-flex-vemd" title="Flex VEMD 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-flex-vemd.jpg" alt="Flex VEMD" width="1200" height="900">

A picture that opens the board, for a README

[![Flex VEMD](https://pcbkit.io/embed/boards/bunpc-nn22-technical-documents-flex-vemd.jpg?size=s)](https://pcbkit.io/boards/bunpc-nn22-technical-documents-flex-vemd)

Source

Repository: BUNPC/NN22-Technical-Documents
Board file: Hardware Main/Electronics/Detector Electronics/DET_Optode/flex-VEMD/flex-VEMD.kicad_pcb
Commit: 4c484d3
Licence: Not stated

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