2 layers93.3 × 69.3 mm
Synkino
fwachsmuth/Synkino
Allows sound playback synchronised to a running,jittery Super 8 projector
145 parts7
4 layers133.8 × 75 mm
AlarmClock
Nuddel69/AlarmClock- Size
- 133.8 × 75 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 112
- Pads
- 293
- Tracks, vias
- 669, 99
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 Sep 2025
- Updated
- 2 Nov 2025
Overview
AlarmClock is an open-source printed circuit board by Nuddel69, from the Nuddel69/AlarmClock repository on GitHub. It is a 4-layer board of 133.8 × 75 mm with 70 parts on 112 nets, routed with 669 tracks and 99 vias.
It is built around the ATMEGA328P-AU, 74HC595 and K38160001210, with the BC846B,215-JSM, DS1302Z+ and KH-6X6X8H-ZJ among its other parts. Its parts include 35 resistors, 14 capacitors, 12 ICs and 4 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
9
ATMEGA328P-AU
TQFP-32(7x7)-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
K38160001210
DT-38-20℃~+70℃ 12pF 16MHz 40Ω Through Hole Crystal Oscillator ±10ppm ±20ppm DT-38 Crystals ROHSKYXCrystals
BC846B,215-JSM
SOT-231 NPN 100MHz 100mA 250 250mW 65V 6V 90mV、200mV NPN SOT-23 Bipolar (BJT) ROHSJSMSEMIBipolar (BJT)
DS1302Z+
SOIC-8Real Time ClocksMaxim Integrated (Analog Devices)
KH-6X6X8H-ZJ
弯插,6x6mm100,000 cycles 6mm 6mm 8mm Black PC Pin Right Angle Round Button SPST With Bracket 弯插,6x6mm Tactile Switches ROHSShenzhen Kinghelm ElecTactile Switches
ME6210A50PG
SOT-89-3-25℃~+85℃ 1 1.7uA 18V 500mA 5V 8mV@(10mA) Fixed Positive Short Circuit Protection SOT-89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMICRONEVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TS-1101-C-W
SMD,6x3.6mm-30℃~+85℃ 12V 2.5mm 2.6N 3.6mm 50,000 cycles 50mA 6mm No Rectangular Button SPST Surface Mount,Vertical Without Bracket SMD,6x3.6mm Tactile Switches ROHSXKB ConnectionTactile Switches
LTS-6960HR
DIP-10LED Segment DisplaysLite-On
README
README.mdAlarm clock
Branches
At the moment, master contains the PCB-project, while main features the code
Todo
- Finish PCB
- Replace digitalWrite with port manipulation, and add supporting logic for bare-metal application
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 32 | 330R | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R101, R102, R103, R104, R105, R106, R107, R108, R109, R110, R111, R112, R113, R114, R115, R116 +16 |
| 8 | 0.1uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C101, C102, C104, C105, C108, C109, C110, C111 |
| 4 | 74HC595 | lcsc:SOP-16_L9.9-W3.9-P1.27-LS6.0-BL | U102, U104, U105, U106 |
| 4 | LTS-6960HR | lcsc:LED-SEG-TH_10P-L12.7-W19.0-P2.54-S15.24-BL | AFF101, AFF102, AFF103, AFF104 |
| 2 | 10nF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C103, C113 |
| 2 | 22pF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C106, C107 |
| 2 | 22uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C112 |
| 2 | Conn_01x11 | Connector_PinHeader_1.00mm:PinHeader_1x11_P1.00mm_Vertical | J102, J103 |
| 2 | K38160001210 | lcsc:DT-38_BD3.1-P1.1 | U109, U110 |
| 1 | 10k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R125 |
| 1 | 1k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R135 |
| 1 | 3362P-1-103_C118956 | lcsc:RES-ADJ-TH_3362P | R134 |
| 1 | ATmega328P-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U103 |
| 1 | BC846B,215 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U112 |
| 1 | Conn_01x05 | Connector_PinHeader_1.00mm:PinHeader_1x05_P1.00mm_Vertical | J101 |
| 1 | DS1302Z+ | lcsc:SOP-8_L4.9-W3.9-P1.27-LS6.0-BL | U101 |
| 1 | KH-6X6X8H-ZJ | lcsc:SW-TH_KH-6X6X8H-ZJ | U111 |
| 1 | ME6210A50PG | lcsc:SOT-89-3_L4.5-W2.5-P1.50-LS4.2-BR | U107 |
| 1 | SUN-12095-5VPA7_6 | lcsc:BUZ-TH_BD12.0-P7.60-D0.6-FD | BUZ101 |
| 1 | Screw_Terminal_01x02 | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J104 |
| 1 | TS-1101-C-W | lcsc:SW-SMD_L6.0-W3.3-LS8.0 | U108 |
Questions
How big is the AlarmClock PCB?
It measures 133.8 × 75 mm and has 4 copper layers, 1.6 mm thick.
What parts does the AlarmClock use?
70 parts, built around the ATMEGA328P-AU, 74HC595, K38160001210 and BC846B,215-JSM. 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 Nuddel69/AlarmClock repository on GitHub, at the commit this page was made from: the board is AlarmClock.kicad_pcb and its schematic Actuator.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 Nuddel69 before reusing the design.
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