2 layers55 × 86 mm
LED Matrix Display Badge
0xlama/ATtiny_LED_Matrix_Display_Badge
An ATtiny85 based badge size PCB that can display alphabets and numbers .
32 parts18MIT
2 layers94 × 35.8 mm
DrillChain
blankAccount01/drillChainA little test circuit made into a keychain
- Size
- 94 × 35.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 8
- Pads
- 31
- Tracks, vias
- 88, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 6 May 2025
- Updated
- 8 May 2025
Overview
DrillChain is an open-source printed circuit board by blankAccount01, from the blankAccount01/drillChain repository on GitHub. It is a 2-layer board of 94 × 35.8 mm with 15 parts on 8 nets, routed with 88 tracks and 0 vias.
It is built around the BS-7. Its parts include 6 resistors, 2 transistors and 1 connector.
Main components
1README
README.mdDrillChain
A keychain shaped to look like a big drill that uses a bistable multivibrator circuit to toggle the mini motor disc off and on.
Schematic
PCB
BOM
- 1 Battery holder
- 2 NPN tranistors
- 2 420Ω resistors
- 4 4.2kΩ resistors
- 1 mini motor disc
- 2 push buttons
Made by @freshlemon on Slack
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | LOGO | LOGO | G***, G***, G*** |
| 2 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6 |
| 2 | 20 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 2 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2 |
| 2 | 700 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4 |
| 2 | SW_Push | Button_Switch_THT:SW_Tactile_Straight_KSL0Axx1LFTR | OFF, ON |
| 1 | BS-7 | test2:Battery_Holder_Coin_2032_BS-7 | BAT1 |
| 1 | Conn_01x02_Socket | Connector_PinSocket_2.00mm:PinSocket_1x02_P2.00mm_Vertical | J1 |
Questions
How big is the DrillChain PCB?
It measures 94 × 35.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DrillChain use?
15 parts, built around the BS-7. 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 DrillChain KiCad files?
From the blankAccount01/drillChain repository on GitHub, at the commit this page was made from: the board is src/drillchain.kicad_pcb and its schematic src/drillchain.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DrillChain design in my own project?
Its repository states no licence, so its author keeps all rights: ask blankAccount01 before reusing the design.
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