2 layers82 × 74.9 mm
2 layers69.8 × 50 mm
AlarmClock
GHOST-mHBr/PCBsMy open source PCBs
- Size
- 69.8 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 43
- Pads
- 123
- Tracks, vias
- 227, 31
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Nov 2024
- Updated
- 6 Feb 2026
Overview
AlarmClock is an open-source printed circuit board by GHOST-mHBr, from the GHOST-mHBr/PCBs repository on GitHub. It is a 2-layer board of 69.8 × 50 mm with 40 parts on 43 nets, routed with 227 tracks and 31 vias.
It is built around the ATMEGA8A-AU and L7805. Its parts include 16 resistors, 7 capacitors, 3 ICs, 3 diodes and 3 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATMEGA8A-AU
TQFP-32(7x7)-40℃~+85℃ 10bit 16MHz 1KB 2.7V~5.5V 23 512Byte 8 Bit 8KB AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
7seg/README.mdPCB for 4-digit multiplexed CC 7-segments
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 150 | Resistor_SMD:R_0603_1608Metric | R10, R11, R12, R13, R14, R15, R16, R17 |
| 6 | 47k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R6 |
| 4 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5 |
| 2 | 18pF | Capacitor_SMD:C_0603_1608Metric | C6, C7 |
| 1 | 1N4007 | Diode_SMD:D_SMA | D2 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 220 | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 32K768 | Crystal:Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | 330nF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | ATmega8A-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U1 |
| 1 | CC56-12GWA | Display_7Segment:CC56-12GWA | U5 |
| 1 | Dec | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | SW3 |
| 1 | Green-smd | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | ISP | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J3 |
| 1 | Inc | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | SW2 |
| 1 | Jack-DC | Connector_BarrelJack:BarrelJack_GCT_DCJ200-10-A_Horizontal | J1 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U2 |
| 1 | Output | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | J2 |
| 1 | Set | Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical | SW1 |
| 1 | blue-smd | LED_SMD:LED_0603_1608Metric | D3 |
The 36 most common of 40 parts.
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Questions
How big is the AlarmClock PCB?
It measures 69.8 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the AlarmClock use?
40 parts, built around the ATMEGA8A-AU and L7805. 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 AlarmClock KiCad files?
From the GHOST-mHBr/PCBs repository on GitHub, at the commit this page was made from: the board is Alarm-Clock/AlarmClock/AlarmClock.kicad_pcb and its schematic 7seg/7seg.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the AlarmClock design in my own project?
Its repository states no licence, so its author keeps all rights: ask GHOST-mHBr before reusing the design.