2 layers142.5 × 106.4 mm
2 layers82 × 50 mm
Keychain solder
moonbeeper/solder-pcbHi there, am @moonbeeper on slack and this is my first ever pcb made for solder.
- Size
- 82 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 9
- Pads
- 34
- Tracks, vias
- 71, 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 Jun 2025
- Updated
- 20 Jun 2025
Overview
Keychain solder is an open-source printed circuit board by moonbeeper, from the moonbeeper/solder-pcb repository on GitHub. It is a 2-layer board of 82 × 50 mm with 34 parts on 9 nets, routed with 71 tracks and 6 vias.
Its parts include 4 resistors, 2 diodes, 2 transistors and 2 switches.
README
README.mdsimple card shaped pcb
Hi there, am @moonbeeper on slack and this is my first ever pcb made for solder.
Images
Description
It's a quite simple pcb. I've been playing around with falstad to create this starting point.
The board has two LEDs that turn on when it gets dark. There's a button to turn the LEDs on manually, and a potentiometer to adjust the sensitivity. The second button turns on a vibration motor.
BOM
| Item | Quantity |
|---|---|
| resistor (220ohm) | 2 |
| resistor (4.7k ohm) | 1 |
| battery holder | 1 |
| led | 2 |
| potentiometer | 1 |
| 2N3904 transistor | 2 |
| mini motor disc | 1 |
| push button | 2 |
| photosensor | 1 |
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G***, G*** +5 |
| 2 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3 |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 2 | NPN | Package_TO_SOT_THT:TO-92L_HandSolder | Q1, Q2 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2 |
| 1 | 4.7K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | Motor_DC | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | M1 |
| 1 | R_Photo | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R1 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Vishay_T73YP_Vertical | RV1 |
Questions
How big is the Keychain solder PCB?
It measures 82 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Keychain solder use?
34 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 Keychain solder KiCad files?
From the moonbeeper/solder-pcb repository on GitHub, at the commit this page was made from: the board is keychain_solder.kicad_pcb and its schematic keychain_solder.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Keychain solder design in my own project?
Its repository states no licence, so its author keeps all rights: ask moonbeeper before reusing the design.
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