2 layers77.5 × 50.8 mm Cdb, the printed circuit board in 3D

Cdb

Comparator Development Board

Size: 77.5 × 50.8 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 56
Nets: 35
Pads: 145
Tracks, vias: 107, 32
Pours: 10
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 18 Mar 2026
Updated: 12 May 2026

Overview

Cdb is an open-source printed circuit board by 0x007E, from the 0x007E/cdb repository on GitHub. It is a 2-layer board of 77.5 × 50.8 mm with 56 parts on 35 nets, routed with 107 tracks and 32 vias.

It is built around the LM339, BAT43 and BUK7880-55A-VB. Its parts include 30 connectors, 9 resistors, 2 capacitors, 2 diodes and 1 IC.

Main components

README

README.md

`CDB` - Comparator Development Board

The CDB is a board with an LM339 or any other 4-channel comparator that meets the pin requirements. The board itself can be driven from 3 to 15V. The board offers the possibility to compare signals from buttons, switches or any other digital/analog board.

Experience	Level
Soldering

Downloads

Type	File	Description
Schematic	pdf / cadlab	Schematic files
Board	pdf / cadlab	Board file
Drill	pdf	Drill file
PCB	zip / tar	KiCAD/Gerber/BoM/Drill files
Mechanical	zip / tar	FreeCAD/Housing and exported step/stl files

Hardware

The pcb is created with KiCAD. All files are built with github actions so that they are ready for a production environment.

PCB

The circuit board is populated on both sides (Top, Bottom). The best way for soldering the SMD components is within a vapor phase soldering system and for the THT components with a standard soldering system.

Top Layer

Bottom Layer

Additional Information

Type	Link	Description
LM339	pdf	Low-Power Low-Offset Voltage Quad Comparators

R. GAECHTER

Parts

Qty	Value	Footprint	References
21	Conn_01x02_Socket	Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical	J10, J11, J12, J13, J14, J15, J16, J17, J18, J19, J20, J21, J22, J23, J24, J25 +5
6	Conn_02x02_Counter_Clockwise	Connector_PinSocket_2.54mm:PinSocket_2x02_P2.54mm_Vertical	J4, J5, J6, J7, J8, J9
4	10k	Resistor_SMD:R_1206_3216Metric	R1, R2, R3, R4
4	270	Resistor_SMD:R_1206_3216Metric	R5, R6, R7, R8
4	MountingHole_Pad	MountingHole:MountingHole_3.2mm_M3_Pad	H1, H2, H3, H4
3	10k	Potentiometer_THT:Potentiometer_Piher_PT-10-V10_Vertical	RV1, RV2, RV3
2	Conn_01x10_Socket	Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical	J1, J3
1	100n	Capacitor_SMD:C_1206_3216Metric	C2
1	10u	Capacitor_THT:CP_Radial_D6.3mm_P2.50mm	C1
1	1k	Resistor_SMD:R_1206_3216Metric	R9
1	BAT43	Diode_SMD:D_MiniMELF	D1
1	BUK7880-55A	Package_TO_SOT_SMD:SOT-223-3_TabPin2	Q1
1	BZ5V1	Diode_SMD:D_MiniMELF	D2
1	Conn_01x02_Pin	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J2
1	ESD	Symbol:ESD-Logo_6.6x6mm_SilkScreen	FID1
1	LM339	Package_SO:SOIC-14_3.9x8.7mm_P1.27mm	U1
1	OH	Symbol:OSHW-Logo_5.7x6mm_SilkScreen	FID3
1	QR	Images:QR_0x007e	FID4
1	Waste	Symbol:WEEE-Logo_4.2x6mm_SilkScreen	FID2

Questions

How big is the Cdb PCB?

It measures 77.5 × 50.8 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Cdb use?

56 parts, built around the LM339, BAT43 and BUK7880-55A-VB. 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 Cdb KiCad files?

From the 0x007E/cdb repository on GitHub, at the commit this page was made from: the board is pcb/CDB.kicad_pcb and its schematic pcb/CDB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Cdb design in my own project?

Its repository states no licence, so its author keeps all rights: ask 0x007E 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/0x007e-cdb" title="Cdb 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/0x007e-cdb.jpg" alt="Cdb" width="1200" height="900">

A picture that opens the board, for a README

[![Cdb](https://pcbkit.io/embed/boards/0x007e-cdb.jpg?size=s)](https://pcbkit.io/boards/0x007e-cdb)

Source

Repository: 0x007E/cdb
Board file: pcb/CDB.kicad_pcb
Commit: bce037a
Licence: Not stated

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