2 layers89.2 × 30.3 mm
2 layers58 × 36 mm
Firealarm
jaka/electronicsschematics and PCBs
- Size
- 58 × 36 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 10
- Pads
- 39
- Tracks, vias
- 51, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 9 Jun 2026
- Updated
- 27 Sep 2026
Overview
Firealarm is an open-source printed circuit board by jaka, from the jaka/electronics repository on GitHub. It is a 2-layer board of 58 × 36 mm with 19 parts on 10 nets, routed with 51 tracks and 0 vias.
It is built around the BC548. Its parts include 6 resistors, 3 capacitors, 3 transistors, 2 crystals and 1 switch.
Main components
1README
Flashing Lights Triple Duo/README.mdFlashing Lights Triple Duo
This circuit consists of two 555 timers configured at different frequencies. These frequencies are selected so that red LED’s and blue LED’s alternatively flashes. Moreover each group (red or blue) flashes aproximately three times before colour is switched, similar to american police strobe lights.
- EDA: Kicad 7.0.11
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MountingHole | MountingHole:MountingHole_3.5mm | H1, H2, H3, H4 |
| 3 | BC548 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1, Q2, Q3 |
| 2 | 22n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2 |
| 2 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R5 |
| 1 | . | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | 100k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 220k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 22uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | BATT. | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | X1 |
| 1 | LS | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | X2 |
Questions
How big is the Firealarm PCB?
It measures 58 × 36 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Firealarm use?
19 parts, built around the BC548. 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 Firealarm KiCad files?
From the jaka/electronics repository on GitHub, at the commit this page was made from: the board is Firealarm/F1.kicad_pcb and its schematic Amplifier TDA2030/TDA2030.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Firealarm design in my own project?
Its repository states no licence, so its author keeps all rights: ask jaka before reusing the design.
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