2 layers40 × 61 mm
Flip segment clock segment driver a3909
joshbohm37/Flip-segment-clock
A breakout board used for driving 1 inch 7 segment electromechanical displays. Built around the A3909.
45 parts
4 layers120 × 65 mm
Flip segment clock main board
joshbohm37/Flip-segment-clockA breakout board used for driving 1 inch 7 segment electromechanical displays. Built around the A3909.
- Size
- 120 × 65 mm
- Copper layers
- 4
- Thickness
- 1.56 mm
- Parts
- 113
- Nets
- 137
- Pads
- 475
- Tracks, vias
- 1,060, 305
- Pours
- 30
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 30 Nov 2025
- Updated
- 6 May 2026
Overview
Flip segment clock main board is an open-source printed circuit board by joshbohm37, from the joshbohm37/Flip-segment-clock repository on GitHub. It is a 4-layer board of 120 × 65 mm with 113 parts on 137 nets, routed with 1,060 tracks and 305 vias.
It is built around the STM32G071CBT6, A3909GLNTR-T and TPS62177DQCR, with the DMN6075S-7-FS, 74HC595 and DS3231MZ+TRL among its other parts. Its parts include 30 capacitors, 25 ICs, 12 resistors, 8 diodes and 8 connectors. It belongs with the lEDs and displays boards and the STM32 boards of this library.
Main components
7
STM32G071CBT6
LQFP-48(7x7)-40℃~+85℃ 1.71V~3.6V 128KB 12bit 12bit 32 Bit 36KB 44 64MHz ARM Cortex-M0+ Built-in+External FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
A3909GLNTR-T
SSOP-10-150mil-40℃~+105℃ 1A 1、2 2 480mΩ 4V~18V 4V~18V Bipolar Driver Yes SSOP-10-150mil Stepper Motor Driver ROHSAllegro MicroSystems, LLCStepper Motor Driver
TPS62177DQCR
WSON-10-EP(2x3)-40℃~+125℃@(TJ) 1 1MHz 22uA 3.3V 4.75V~28V 500mA Buck Buck Built-in Fixed Yes WSON-10-EP(2x3) DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
DMN6075S-7-FS
SOT-23SOT-23 MOSFETs ROHSFUXINSEMIMOSFETs
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
DS3231MZ+TRL
SOIC-8-40℃~+85℃ 100nA 2.3V~5.5V 200uA Built-in I2C Temperature compensation、Backup power management and battery charging、Alarm function、Periodic interrupt output Yes SOIC-8 Real Time Clocks ROHSMaxim Integrated (Analog Devices)Real Time Clocks
CR2032
-- Unclassified goods ROHSMaxellUncategorised
README
README.mdFlip Segment Clock
A desktop clock centered around electromechanical 7 segment flip displays.
Parts
113| Qty | Value | Footprint | References |
|---|---|---|---|
| 22 | 100 nF | Capacitor_SMD:C_0402_1005Metric | C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C26 +6 |
| 16 | A3909GLNTR-T | SamacSys_Parts:SOP100P600X175-10N | IC4, IC5, IC6, IC7, IC8, IC9, IC10, IC11, IC12, IC13, IC14, IC15, IC16, IC17, IC18, IC19 |
| 6 | 100K | Resistor_SMD:R_0402_1005Metric | R6, R7, R8, R9, R10, R11 |
| 6 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4, H5, H6 |
| 4 | 10 uF | Capacitor_SMD:C_1206_3216Metric | C24, C28, C29, C30 |
| 4 | DMN6075S-7 | SamacSys_Parts:SOT96P240X110-3N | IC20, IC21, IC22, IC23 |
| 4 | TestPoint | TestPoint:TestPoint_Pad_D2.0mm | MISO, MOSI, RDY, SCK |
| 2 | 4.7k | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1, U2 |
| 1 | 0 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5 |
| 1 | 10 uH | Inductor_SMD:L_Coilcraft_LPS4018 | L1 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R3 |
| 1 | 10k | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 12v | TestPoint:TestPoint_Pad_D2.0mm | 12v |
| 1 | 2.2 uF | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | 22 uF | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 3.3v | TestPoint:TestPoint_Pad_D2.0mm | 3.3V |
| 1 | 32 kHz | TestPoint:TestPoint_Pad_D2.0mm | 32KHZ |
| 1 | 4.7 uF | Capacitor_SMD:C_1206_3216Metric | C5 |
| 1 | 50k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 560 uF | Capacitor_SMD:C_Elec_10x10.2 | C25 |
| 1 | CR2032 | SamacSys_Parts:BATHLD013SMTTR | BT1 |
| 1 | DIG1 | TestPoint:TestPoint_Pad_D2.0mm | D1 |
| 1 | DIG1_L | TestPoint:TestPoint_Pad_D2.0mm | D1L |
| 1 | DIG2 | TestPoint:TestPoint_Pad_D2.0mm | D2 |
| 1 | DIG2_L | TestPoint:TestPoint_Pad_D2.0mm | D2L |
| 1 | DIG3 | TestPoint:TestPoint_Pad_D2.0mm | D3 |
| 1 | DIG3_L | TestPoint:TestPoint_Pad_D2.0mm | D3L |
| 1 | DIG4 | TestPoint:TestPoint_Pad_D2.0mm | D4 |
| 1 | DIG4_L | TestPoint:TestPoint_Pad_D2.0mm | D4L |
| 1 | DS3231MZ+TRL | SamacSys_Parts:SOIC127P600X175-8N | IC2 |
| 1 | Digit 1 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J5 |
| 1 | Digit 2 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J6 |
| 1 | Digit 3 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J7 |
| 1 | Digit 4 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J8 |
| 1 | GND | TestPoint:TestPoint_Pad_D2.0mm | GND |
| 1 | GPIO | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J4 |
| 1 | NRST | SamacSys_Parts:15715636 | SW1 |
| 1 | NRST | TestPoint:TestPoint_Pad_D2.0mm | NRST |
| 1 | OEINV | TestPoint:TestPoint_Pad_D2.0mm | NOE |
| 1 | P_GOOD | TestPoint:TestPoint_Pad_D2.0mm | P_GOOD |
| 1 | P_SLEEP | TestPoint:TestPoint_Pad_D2.0mm | SLP |
| 1 | RCLK | TestPoint:TestPoint_Pad_D2.0mm | RCLK |
| 1 | RTC_NRST | TestPoint:TestPoint_Pad_D2.0mm | NRST |
| 1 | SCL | TestPoint:TestPoint_Pad_D2.0mm | SDA |
| 1 | SDA | TestPoint:TestPoint_Pad_D2.0mm | SCL |
| 1 | SER | TestPoint:TestPoint_Pad_D2.0mm | MOSI |
| 1 | SRCLK | TestPoint:TestPoint_Pad_D2.0mm | SCK |
| 1 | SRCLRINV | TestPoint:TestPoint_Pad_D2.0mm | NSR_CLR |
| 1 | STLINK | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J3 |
| 1 | STM32G071CBT6 | STM32G071CBT6:QFP50P900X900X160-48N | IC3 |
| 1 | Screw_Terminal | SamacSys_Parts:1548128 | J1 |
| 1 | TPS62177DQCR | SamacSys_Parts:SON50P200X300X80-11N | IC1 |
| 1 | Vin | TestPoint:TestPoint_Pad_D2.0mm | 12v |
| 1 | WIFI | Connector_PinSocket_2.54mm:PinSocket_1x07_P2.54mm_Vertical | J2 |
| 1 | WIFI_EN | TestPoint:TestPoint_Pad_D2.0mm | EN |
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Questions
How big is the Flip segment clock main board PCB?
It measures 120 × 65 mm and has 4 copper layers, 1.56 mm thick.
What parts does the Flip segment clock main board use?
113 parts, built around the STM32G071CBT6, A3909GLNTR-T, TPS62177DQCR and DMN6075S-7-FS. 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 Flip segment clock main board KiCad files?
From the joshbohm37/Flip-segment-clock repository on GitHub, at the commit this page was made from: the board is hardware/main-board/pcb/flip-segment-clock_main-board/flip-segment-clock_main-board.kicad_pcb and its schematic hardware/display-hats/pcb/flip-segment-clock_display-hats/flip-segment-clock_display-hats.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Flip segment clock main board design in my own project?
Its repository states no licence, so its author keeps all rights: ask joshbohm37 before reusing the design.