2 layers107 × 54 mm
2 layers30 × 37.5 mm
555-astable timer
Agarwal-Amogh/555-astable-timerA 555 timer configured in astable mode designed using KiCad and verified using LTspice.
- Size
- 30 × 37.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 7
- Pads
- 24
- Tracks, vias
- 45, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Jul 2026
- Updated
- 21 Jul 2026
Overview
555-astable timer is an open-source printed circuit board by Agarwal-Amogh, from the Agarwal-Amogh/555-astable-timer repository on GitHub. It is a 2-layer board of 30 × 37.5 mm with 9 parts on 7 nets, routed with 45 tracks and 0 vias.
It is built around the NE555D. Its parts include 3 capacitors, 3 resistors, 1 IC and 1 diode.
Main components
1README
README.md555 Timer Astable Multivibrator
Overview
A 555 timer configured in astable mode designed using KiCad and verified using LTspice.
Features
- LTspice simulation
- KiCad schematic
- PCB layout
- Gerber files
- Through-hole components
Tools Used
- KiCad 9
- LTspice
Circuit
Simulation
PCB
Future Improvements
- Add power LED
- Add mounting holes
- Ground plane
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2, C3 |
| 2 | 150k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R3 |
| 1 | 9 | Connector_PinHeader_1.00mm:PinHeader_1x02_P1.00mm_Horizontal | V1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | NE555D | Package_DIP:DIP-8-16_W7.62mm | U2 |
Questions
How big is the 555-astable timer PCB?
It measures 30 × 37.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 555-astable timer use?
9 parts, built around the 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 555-astable timer KiCad files?
From the Agarwal-Amogh/555-astable-timer repository on GitHub, at the commit this page was made from: the board is KiCad/555_Astable_timer.kicad_pcb and its schematic KiCad/555_Astable_timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 555-astable timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask Agarwal-Amogh before reusing the design.
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