4 layers88 × 58 mm
BIOCHEST ECG EMG
8aChristian/BIOCHEST-ECG-EMG
Figure 1: Full 4-Layer High-Density Medical PCBA with Galvanic Isolation Barrier & Routed Copper Tracks.
29 parts
2 layers100 × 90 mm
An LCR meter
- Size
- 100 × 90 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 141
- Nets
- 111
- Pads
- 438
- Tracks, vias
- 906, 115
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 16 May 2026
- Updated
- 12 Aug 2026
Overview
Lcr is an open-source printed circuit board by Hardware7253, from the Hardware7253/lcr repository on GitHub. It is a 2-layer board of 100 × 90 mm with 141 parts on 111 nets, routed with 906 tracks and 115 vias.
It is built around the STM32G431CBT6, B0503S-1WR3 and TLV75801PDBV, with the TPS22919DCK, USBLC6-2SC6 and CUS10S30 among its other parts. Its parts include 44 capacitors, 34 resistors, 13 diodes, 10 ICs and 6 connectors. It belongs with the STM32 boards of this library.
Main components
6
STM32G431CBT6
LQFP-48(7x7)-40℃~+85℃ 1.71V~3.6V 128KB 12bit 12bit 170MHz 32 Bit 32KB 38 ARM Cortex-M4F Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
B0503S-1WR3
SIP,11.7x6mm-40℃~+105℃ 1 1.5kV 10.2mm 11.68mm 1W 200kHz~340kHz 2400uF 3.3V 303mA 30mVp-p 4.5V~5.5V 6mA 6mm 74% Short Circuit Protection 塑封型 非稳压型 SIP,11.7x6mm Isolated Power Modules ROHSEVISUNIsolated Power Modules
TLV75801PDBV
SOT-23-5-40℃~+125℃@(Tj) 1 130mV@(500mA) 25uA 30uVrms 500mA 50dB@(1kHz) 550mV~5.5V 6V Adjustable Positive Under Voltage Lockout、Soft Start、Short Circuit Protection、Thermal Shutdown SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TPS22919DCK
SC-70-6-40℃~+125℃ 1 1.5A 1.6V~5.5V 89mΩ Active High Load Switch Output discharge function、Soft-start、Overcurrent Protection、Over temperature protection、Short-Circuit Protection SC-70-6 Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
CUS10S30
SOD-323Schottky DiodesDOWO
README
readme.mdLCR Meter
Description
This LCR meter is capable of measuring complex impedance of various passive components and features auto-ranging. Figure 1 shows the basic test circuit and provides an equation that can be used to calculate the impedance of the DUT. This circuit + additional filtering and biasing is used within the LCR design. The MCU software uses the pk-pk values of the sampled waveforms for magnitudes, and calculates the phase difference using in-phase and quadrature components of the multiplied current and test voltage waveforms (v3 & v2). The IQ components are low-pass-filtered, then their arctan is taken to find the phase difference.
Demos
Additional photos
Parts
141| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 100n | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5, C10, C17, C25, C26, C30, C37, C38, C40, C42, C43, C44 |
| 11 | 10u | Capacitor_SMD:C_0603_1608Metric | C1, C8, C9, C11, C21, C22, C27, C28, C29, C35, C39 |
| 8 | 100 | Resistor_SMD:R_0603_1608Metric | R11, R19, R22, R28, R29, R32, R33, R34 |
| 8 | 1k | Resistor_SMD:R_0603_1608Metric | R2, R3, R4, R8, R10, R15, R16, R18 |
| 8 | TestPoint | TestPoint:TestPoint_Keystone_5000-5004_Miniature | TP2, TP8, TP9, TP13, TP14, TP15, TP16, TP17 |
| 7 | CUS10S30 | Diode_SMD:D_SOD-323_HandSoldering | D4, D5, D8, D9, D11, D12, D13 |
| 6 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP5, TP6, TP7, TP10, TP11, TP12 |
| 5 | 1u | Capacitor_SMD:C_0603_1608Metric | C7, C12, C13, C18, C19 |
| 5 | 4u7 | Capacitor_SMD:C_0603_1608Metric | C16, C20, C23, C24, C34 |
| 5 | 5k1 | Resistor_SMD:R_0603_1608Metric | R1, R7, R9, R25, R27 |
| 4 | 10k | Resistor_SMD:R_0603_1608Metric | R5, R12, R13, R30 |
| 4 | 22k | Resistor_SMD:R_0603_1608Metric | R17, R20, R21, R23 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 100k | Resistor_SMD:R_0603_1608Metric | R24, R26, R31 |
| 3 | 10n | Capacitor_SMD:C_0603_1608Metric | C6, C31, C33 |
| 3 | 220n | Capacitor_SMD:C_0603_1608Metric | C32, C36, C41 |
| 3 | G6K-2 | Relay_SMD:Relay_DPDT_Omron_G6K-2F-Y | K1, K2, K3 |
| 3 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D3 |
| 3 | NMOS | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3 |
| 3 | OPA2197xDGK | CustomFootprints:VSSOP-8_3x3mm_P0.65mm | U8, U9, U10 |
| 3 | TVS | Diode_SMD:D_SOD-323_HandSoldering | D6, D7, D10 |
| 2 | 20p | Capacitor_SMD:C_0603_1608Metric | C14, C15 |
| 2 | Probe + | CustomFootprints:Banana_Red | J3, J4 |
| 2 | Probe - | CustomFootprints:Banana_Black | J5, J6 |
| 2 | SW_Push | CustomFootprints:Korean Hroparts Elec K2-1107ST-A4DW-06 | SW1, SW2 |
| 2 | TLV757P | Package_TO_SOT_SMD:SOT-23-5 | U3, U6 |
| 1 | 25MHz | Oscillator:Oscillator_SMD_Abracon_ASE-4Pin_3.2x2.5mm | Y2 |
| 1 | 2k7 | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | 470k | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 8 MHz | Crystal:Crystal_SMD_5032-2Pin_5.0x3.2mm | Y1 |
| 1 | AD9833xRM | CustomFootprints:MSOP-10_3x3mm_P0.5mm | U7 |
| 1 | B0503S-1WR3 | Converter_DCDC:Converter_DCDC_Murata_MEE1SxxxxSC_THT | PS1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | Housing_Pad | TestPoint:TestPoint_Pad_2.0x2.0mm | N1 |
| 1 | MCO | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | PB6 | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | SSD1315 | CustomFootprints:0.96 Inch OLED Display | DS1 |
| 1 | STM32G431CBT6 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U2 |
| 1 | TLV75801PDBV | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | TPS22919DCK | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U4 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U5 |
| 1 | USB_C_Receptacle_USB2.0_16P | CustomFootprints:USB_TYPE-C-31-M-12 | J2 |
Questions
How big is the Lcr PCB?
It measures 100 × 90 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Lcr use?
141 parts, built around the STM32G431CBT6, B0503S-1WR3, TLV75801PDBV and TPS22919DCK. 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 Lcr KiCad files?
From the Hardware7253/lcr repository on GitHub, at the commit this page was made from: the board is PCB/lcr.kicad_pcb and its schematic PCB/analog_section.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lcr design in my own project?
Its repository states no licence, so its author keeps all rights: ask Hardware7253 before reusing the design.
Similar boards
- 2 layers21.4 × 51.8 mm
Stm32f072-breakout board
HayataSama/stm32f072-breakout-board
This is a breakout (development) board based on STM32F072CBT6
36 parts1 - 4 layers72 × 44 mm
Picflash board
nthclrd/picflash
Programmeur PIC open source en Rust : remplace MPLAB IPE/XC8 pour les PIC16, pilote les PICkit 4/5/Basic ou une carte RP2040 maison (KiCad)
115 parts1MIT - 2 layers124.8 × 68 mm
ESP-32-RELAY CONTROLLER
pasachan/ESP-32-RELAY-CONTROLLER
An 8-channel relay controller with Wi-Fi, an RS-485 field bus, and a 12 V power rail for downstream nodes. Designed as the master board for a small home-automation network: this board switches loads directly, talks to…
106 parts1CERN-OHL-P-2.0 - 2 layers56.8 × 38.8 mm
- 2 layers42.5 × 21.8 mm
AirDAP
guolic1/AirDAP
基于 ESP32-S3 的无线调试器，支持 CMSIS-DAP 调试烧录和串口通信。 通过 USB 直连，或使用 Windows / Linux 主机服务将网络设备映射为 USB 调试器和串口。
79 partsMIT - 4 layers90.9 × 50.3 mm
- 4 layers52.1 × 40 mm
Fsoc tx
SharbelMarshi/txrx-optical-communication-kicad
A Free-Space Optical Communication link KiCad project
54 parts1