2 layers43.9 × 27.7 mm
2 layers96.8 × 65.5 mm
Birthday keychain
tobycm/blahaj-keychain1blahaj keychain, perfect for presents :3
- Size
- 96.8 × 65.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 15
- Pads
- 43
- Tracks, vias
- 2,290, 6
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 8 May 2025
- Updated
- 8 May 2025
Overview
Birthday keychain is an open-source printed circuit board by tobycm, from the tobycm/blahaj-keychain repository on GitHub, published under the MIT licence. It is a 2-layer board of 96.8 × 65.5 mm with 19 parts on 15 nets, routed with 2,290 tracks and 6 vias.
Its parts include 8 resistors, 3 transistors, 2 diodes, 1 capacitor and 1 switch.
README
README.mdBlahaj Keychain
with glow-in-the-dark eye, purrfect for presents :3
Schematic
PCB
Features
- stay-on LED after pressing the button
- glow-in-the-dark eye
- shiny body
- very cute
BOM
| Part | Value | Quantity |
|---|---|---|
| Resistor | 4.7k | 1 |
| Resistor | 220 | 6 |
| Photoresistor | 1 | |
| LED | 2 | |
| Capacitor | 10uF | 1 |
| 2N3904 | 2 | |
| 2N3906 | 1 | |
| Battery Holder | 1 | |
| Button | 1 |
made by the one and only @tobycm :3 rawrrrr
readme copied inspired from https://github.com/cheyao/Open555
design ur own pcb at https://solder.hackclub.com
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R4, R5, R6, R7, R8 |
| 2 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2 |
| 2 | LED | LED_THT:LED_D5.0mm | D1, D2 |
| 2 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2 |
| 1 | 10uF | Capacitor_THT:C_Disc_D7.5mm_W2.5mm_P5.00mm | C1 |
| 1 | 2N3906 | Package_TO_SOT_THT:TO-92_Inline | Q3 |
| 1 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | Battery_Cell | Battery:BatteryHolder_Keystone_3034_1x20mm | BT1 |
| 1 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad | H1 |
| 1 | R_Photo | OptoDevice:R_LDR_5.1x4.3mm_P3.4mm_Vertical | R2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
Questions
How big is the Birthday keychain PCB?
It measures 96.8 × 65.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Birthday keychain use?
19 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 Birthday keychain KiCad files?
From the tobycm/blahaj-keychain repository on GitHub, at the commit this page was made from: the board is birthday-keychain.kicad_pcb and its schematic birthday-keychain.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Birthday keychain design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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