2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers20 × 25 mm
This is a simple current detector circuit with 555 timer
- Size
- 20 × 25 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 7
- Pads
- 22
- Tracks, vias
- 48, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Apr 2026
- Updated
- 14 Apr 2026
Overview
555Timer is an open-source printed circuit board by DZDevelopers, from the DZDevelopers/Resolution-Hardware-Week-3 repository on GitHub. It is a 2-layer board of 20 × 25 mm with 7 parts on 7 nets, routed with 48 tracks and 0 vias.
It is built around the NE555P. Its parts include 2 resistors, 1 capacitor, 1 IC, 1 diode and 1 connector.
Main components
1README
README.mdResolution-Hardware-Week-3
This is a simple current detector circuit with 555 timer
when the voltage at pin-2 falls below ⅓ of the VCC the output pin of the 555 Timer goes high and the LED lights up and when its above ⅓ VCC the output goes low and the led shuts down. When the antenna detects an alternating input the output goes HIGH and LOW and the LED flashes accordingly.
Schematic
PCB
Thanks to Debashis Das for the original idea
Parts
7| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 10kΩ | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2 |
| 1 | 220Ω | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3 |
| 1 | Antenna | RF_Antenna:Abracon_PRO-OB-440 | AE1 |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U1 |
Questions
How big is the 555Timer PCB?
It measures 20 × 25 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 555Timer use?
7 parts, built around the NE555P. 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 555Timer KiCad files?
From the DZDevelopers/Resolution-Hardware-Week-3 repository on GitHub, at the commit this page was made from: the board is src/KiCad/555Timer.kicad_pcb and its schematic src/KiCad/555Timer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 555Timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask DZDevelopers before reusing the design.
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