2 layers68.6 × 53.3 mm
Jeopardy hw
entropia/jeopardy-helmets
An arduino hackery to create a visual buzzer for jeopardy
13 parts
2 layers78.8 × 79.8 mm
Heart-555-Timer
aayanrahman/Heart-555-TimerA heart 555 timer I made for ... myself? Might make a document on how to make it
- Size
- 78.8 × 79.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 27
- Pads
- 79
- Tracks, vias
- 128, 6
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 3 Feb 2026
- Updated
- 3 Feb 2026
Overview
Heart-555-Timer is an open-source printed circuit board by aayanrahman, from the aayanrahman/Heart-555-Timer repository on GitHub. It is a 2-layer board of 78.8 × 79.8 mm with 30 parts on 27 nets, routed with 128 tracks and 6 vias.
It is built around the ULQ2003A. Its parts include 14 diodes, 8 resistors, 2 capacitors and 2 ICs.
Main components
1Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 14 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14 |
| 7 | 270 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R3, R4, R5, R6, R7, R8 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | 0.1m | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 100k | Potentiometer_THT:Potentiometer_Bourns_PTV09A-1_Single_Vertical | RV1 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C2 |
| 1 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | Battery | Connector_Wire:SolderWire-0.1sqmm_1x02_P3.6mm_D0.4mm_OD1mm | BT1 |
| 1 | LM555xN | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | ULQ2003A | Package_DIP:DIP-16_W7.62mm | U2 |
Questions
How big is the Heart-555-Timer PCB?
It measures 78.8 × 79.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Heart-555-Timer use?
30 parts, built around the ULQ2003A. 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 Heart-555-Timer KiCad files?
From the aayanrahman/Heart-555-Timer repository on GitHub, at the commit this page was made from: the board is Heart 555 Timer.kicad_pcb and its schematic Heart 555 Timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Heart-555-Timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask aayanrahman before reusing the design.
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