2 layers
2 layers125 × 75 mm
STM32
- Size
- 125 × 75 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 154
- Nets
- 130
- Pads
- 449
- Tracks, vias
- 1,110, 112
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Aug 2025
- Updated
- 6 Sep 2025
Overview
Ex1 is an open-source printed circuit board by Do-Minh-Hien, from the Do-Minh-Hien/PCB repository on GitHub. It is a 2-layer board of 125 × 75 mm with 154 parts on 130 nets, routed with 1,110 tracks and 112 vias.
It is built around the LM2596S-ADJ, XL1509-5.0 and LM1117DT-3.3, with the C1815 among its other parts. Its parts include 64 resistors, 20 diodes, 17 transistors, 11 capacitors and 10 connectors. It belongs with the STM32 boards of this library.
Main components
4
LM2596S-ADJ
TO-263-5-40℃~+125℃@(TA) 1 1.2V~37V 150kHz 3A 40V 80uA Adjustable Buck Buck Built-in No TO-263-5 DC-DC Converters ROHSUMWDC-DC Converters
XL1509-5.0
SOIC-8-40℃~+125℃ 1 150kHz 2A 2mA 4.5V~40V 5V Buck Buck Built-in Fixed No SOIC-8 DC-DC Converters ROHSUMWDC-DC Converters
LM1117DT-3.3
TO-2520℃~+125℃@(Tj) 1 1.2V@(800mA) 15V 3.3V 5mA 75dB@(120Hz) 800mA Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive TO-252 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
C1815
SOT-23-55℃~+150℃ 1 NPN 100nA 150mA 200 200mW 250mV 50V 5V 80MHz NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
Parts
154| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R41, R42, R43, R44, R45, R46, R47, R48, R49, R50, R51, R52, R53, R54, R55, R56 +9 |
| 12 | 7002_GSD | Package_TO_SOT_SMD:SOT-23 | Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17 |
| 10 | LED | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D6, D7, D8, D9, D10, D11, D13, D14, D16, D18 |
| 9 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R15, R17, R20, R23, R26, R29, R32, R35, R38 |
| 7 | 1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R27, R28, R31, R34, R37, R39, R65 |
| 6 | 2.2K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9, R10, R25, R30, R33, R36 |
| 5 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | 0.1uF1, C2, C4, C6, C8 |
| 5 | C1815 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5 |
| 5 | D | Diode_SMD:D_SMA | D12, D15, D17, D19, D20 |
| 4 | 150R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14, R16, R19, R22 |
| 4 | 20pF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10, C11, C12, C13 |
| 4 | 470R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13, R18, R21, R24 |
| 4 | C | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | 0.1uF2, 0.1uF3, 0.1uF4, 0.1uF5 |
| 4 | G5NB | Relay_THT:Relay_SPST_Omron_G5NB | K1, K2, K3, K4 |
| 4 | PC817 | Package_DIP:DIP-4_W7.62mm | U3, U6, U7, U8 |
| 4 | TestPoint | TestPoint:TestPoint_Plated_Hole_D4.0mm | TP1, TP2, TP3, TP4 |
| 3 | 220uF/50V | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C1, C5, C7 |
| 3 | Conn_01x08_Socket | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4, J6, J7 |
| 2 | 100K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R7, R8 |
| 2 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9, C15 |
| 2 | 1M | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R11, R12 |
| 2 | Conn_01x02 | TerminalBlock:TerminalBlock_bornier-2_P5.08mm | J1, J2 |
| 2 | Conn_01x04_Socket | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J8, J9 |
| 2 | LED_VCC | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3, D5 |
| 2 | L_100uH | Inductor_THT:L_Toroid_Vertical_L14.7mm_W8.6mm_P5.58mm_Pulse_KM-1 | L1, L2 |
| 2 | SS16-1N5822 | Diode_THT:D_DO-201AD_P15.24mm_Horizontal | D2, D4 |
| 1 | 100uF/50V | Capacitor_THT:CP_Radial_D8.0mm_P3.80mm | C3 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C14 |
| 1 | 32.768K | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm_HandSoldering | Y2 |
| 1 | 330 | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | 8MHz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | Conn_01x08_Socket | TerminalBlock:TerminalBlock_bornier-8_P5.08mm | J5 |
| 1 | Conn_02x03 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | P1 |
| 1 | Conn_02x08_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J10 |
| 1 | KBL406G | My_Footprint_Library:SIP600W130P510L1900H1630Q4 | D21 |
| 1 | LM1117DT-3.3 | My_Footprint_Library:TO254P470X1016X2222-3P | U4 |
| 1 | LM2596S-ADJ | Package_TO_SOT_SMD:TO-263-5_TabPin3 | U1 |
| 1 | R3 | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | RST | Button_Switch_SMD:SW_DIP_SPSTx01_Slide_6.7x4.1mm_W6.73mm_P2.54mm_LowProfile_JPin | SW3 |
| 1 | R_ByPass | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | R_VCC | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | R_VCC | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | STM32F103CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U5 |
| 1 | XL1509-5.0 | Package_SO:SOP-8_3.76x4.96mm_P1.27mm | U2 |
Questions
How big is the Ex1 PCB?
It measures 125 × 75 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ex1 use?
154 parts, built around the LM2596S-ADJ, XL1509-5.0, LM1117DT-3.3 and C1815. 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 Ex1 KiCad files?
From the Do-Minh-Hien/PCB repository on GitHub, at the commit this page was made from: the board is Ex1.kicad_pcb and its schematic Ex1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ex1 design in my own project?
Its repository states no licence, so its author keeps all rights: ask Do-Minh-Hien before reusing the design.
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