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2 layers47 × 44 mmReflow example, the printed circuit board in 3D

Reflow example

hackclub/reflow2

A YSWS for the northern hemisphere's summer and the aussie's winter. Run by @pmnlla, with love and loads of carrots.

Size
47 × 44 mm
Copper layers
2
Thickness
1.6 mm
Parts
56
Nets
50
Pads
164
Tracks, vias
613, 135
Pours
1
Routed
Yes
KiCad
KiCad 9.0 (file 20241228)
Created
16 Jun 2025
Updated
10 Aug 2025

Overview

Reflow example is an open-source printed circuit board by hackclub, from the hackclub/reflow repository on GitHub. It is a 2-layer board of 47 × 44 mm with 56 parts on 50 nets, routed with 613 tracks and 135 vias.

It is built around the CD4511BNSR and NE555D. Its parts include 28 diodes, 18 resistors, 4 ICs and 1 capacitor.

Main components

2

README

readme.md

Reflow!

It's a YSWS. You ship something, we ship something to you in return. Run by gh@pmnlla

Phase 1: Submit a design!

You ship: A printed circuit board.

  • Your full design criteria is situated at the website. Have a look through it, you'll need it later :3
  • Your folder structure should look just about like this:
text
    - pcb                          
       └──name of your pcb                                                                                    
         ├────────README.md                                                 
         └────────cad                                                   
                   ├──────<name>.kicad_sch                              
                   ├──────<name>.kicad_pcb                             
                   ├──────<name>.kicad_dru                          
                   └──────<name>.kicad_pro     
                                               
                                               

Send it over in a PR, we'll review it, and dispatch the WS prize!

  • A series of files you are not allowed to upload:
    • Anything with wildcards, relative paths, or attempts to escape your submission in the /pcb directory
    • PCB files that do NOT pass DRC with 0 errors.
    • Edits to folders you have not made the previous commit to, i.e. folders that are not your PCB.
    • Backups, ZIPs, or entire component libraries. There should be a link to where to find them in your README.
    • Gerbers - unlike onboard, this YSWS generates gerbers per every submission, for manual reviewl You do not need to upload them, and it is discouraged.

Got questions? You can reach me on slack @ U078HNSV750

We ship: A practice kit to learn SMD soldering with!

You'll get a:

  • Practice board, with a set functionality of a 7 segment counter. 4 of them, to be exact.
  • Components to populate at least one of the boards with
  • A pair of tweezers
  • A tub of flux
  • A tin of solder paste, low melt, unleaded.
  • A USB-C powered hotplate!

Phase 2: Learn to solder:

You ship: Evidence of a completed and functional practice board, to the smallest components you can see and solder. We ship: Funds, through HCB, for you to get your very own design made, and get the parts to assemble it with!

Parts

56
QtyValueFootprintReferences
14470RCapacitor_SMD:C_1206_3216MetricR3, R3, R3, R3, R3, R3, R3, R3, R3, R3, R3, R3, R3, R3
7LEDDiode_SMD:D_0402_1005MetricD3, D4 x7, D5, D7, D9, D11, D13
7LEDDiode_SMD:D_0805_2012MetricD2, D2, D2, D17, D19, D23, D25
7LEDDiode_SMD:D_0603_1608MetricD3, D3, D3, D4, D6, D10, D12
7LEDDiode_SMD:D_1206_3216MetricD1, D1, D1, D18, D20, D24, D26
25k1Capacitor_SMD:C_1206_3216MetricR2, R2
2CD4511BNSRKiCad:SOIC127P780X200-16NIC1, IC1
110uFCapacitor_SMD:C_1206_3216MetricC1
11kCapacitor_SMD:C_1206_3216MetricR1
14518Package_DIP:DIP-16_W8.89mm_SMDSocket_LongPadsIC2
147kCapacitor_SMD:C_1206_3216MetricR1
1NE555DPackage_SO:SOIC-8_3.9x4.9mm_P1.27mmIC3
1USB_C_Receptacle_PowerOnly_6PConnector_USB:USB_C_Receptacle_GCT_USB4135-GF-A_6P_TopMnt_HorizontalUSBC

The 52 most common of 56 parts.

Questions

How big is the Reflow example PCB?

It measures 47 × 44 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Reflow example use?

56 parts, built around the CD4511BNSR and NE555D. 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 Reflow example KiCad files?

From the hackclub/reflow repository on GitHub, at the commit this page was made from: the board is pcb/reflow-example/reflow-example.kicad_pcb and its schematic pcb/MP3-Player/cad/MP3 Player.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Reflow example design in my own project?

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

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