4 layers97 × 87 mm
2 layers64 × 55.2 mm
LCRmeter
ironiron/LCRmeter- Size
- 64 × 55.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 62
- Pads
- 261
- Tracks, vias
- 678, 94
- Pours
- 378
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 9 Sep 2019
- Updated
- 28 Feb 2026
Overview
LCRmeter is an open-source printed circuit board by ironiron, from the ironiron/LCRmeter repository on GitHub. It is a 2-layer board of 64 × 55.2 mm with 70 parts on 62 nets, routed with 678 tracks and 94 vias.
It is built around the 74LVC1G66GW, 74HC14 and LM1117MP-3.3, with the BAT54S, BAT54CW and NX7002BKR among its other parts. Its parts include 25 resistors, 14 capacitors, 11 ICs, 6 connectors and 5 switches. It belongs with the STM32 boards of this library.
Main components
6
74LVC1G66GW
SOT-353-40℃~+125℃ 1.65V~5.5V 11pF 155MHz 1:1 4.2ns 5.3ns 600ps 6Ω SOT-353 Analog Switches, Multiplexers ROHSNexperiaAnalog Switches, Multiplexers
74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters
LM1117MP-3.3
SOT-2230℃~+125℃@(Ta) 1 1.2V@(800mA) 15V 3.3V 5mA 75dB@(120Hz) 800mA 99uVrms Fixed Over Current Protection、Over Temperature Protection Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BAT54S
SOT-231 Pair Series Connection 1V@100mA 200mA 2uA@25V 30V 600mA SOT-23 Schottky Diodes ROHSMDDSchottky Diodes
BAT54CW
SOT-323-3-65℃~+125℃ 1 Pair Common Cathode 1V@100mA 200mA 2uA@25V 30V 600mA SOT-323-3 Schottky Diodes ROHSDiodes IncorporatedSchottky DiodesNX7002BKR
SOT-23-55℃~+150℃ 1 N-channel 1nC@10V 2.1V 2.8Ω@10V 23.6pF 270mA 310mW 3pF 60V SOT-23 MOSFETs ROHSNexperiaMOSFETs
README
LCRmeter_PCB/readme.mdtodo
- add connector for UART converter for debugging
- add testpoint for ADC measurments
- make oled from discrete parts, not module
- change connector for programmmer, and move it out of the top layer
- check if PCB can be smaller (especially batterry holder)
- add more Rseries options
- remove option without Rseries connected at all - it can fry PCB
- remove connection to 2nd ADCs
- Are there better opamps??
- remove option for 1.5 V ref
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3, C4, C5, C7, C9, C10, C12, C13, C14, C15 |
| 9 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R4, R5, R6, R9, R10, R11, R12, R13 |
| 6 | 0 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R7, R8, R17, R20, R21 |
| 4 | 1k5 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R14, R15, R16, R24 |
| 3 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C18, C19 |
| 3 | 74LVC1G66 | Package_TO_SOT_SMD:SOT-23-5 | U1, U2, U7 |
| 3 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D2, D3, D4 |
| 3 | MCP6001-OT | Package_TO_SOT_SMD:SOT-23-5 | U5, U8, U10 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R22, R23 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_1.0x1.0mm | TP3, TP4 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 10u | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | L2 |
| 1 | 2k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R18 |
| 1 | 2k2 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R25 |
| 1 | 2u2 | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C11 |
| 1 | 500 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R19 |
| 1 | 74HC14 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | BAT54CW | Package_TO_SOT_SMD:SOT-23 | D6 |
| 1 | Batt | Battery:BatteryHolder_Keystone_2468_2xAAA | BT1 |
| 1 | LCR_input | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | LCR_input | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J2 |
| 1 | LM1117MP-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U9 |
| 1 | NX7002BKR | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | OLED | footprints:OLED_128x64 | U3 |
| 1 | Prog_interface | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | STM32G473C_B-C-E_Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U6 |
| 1 | TPS2116DRLR | Library_Loader:SOTFL50P160X60-8N | IC1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex_47346-0001 | J4 |
| 1 | back | Button_Switch_SMD:SW_SPST_REED_CT05-XXXX-G1 | SW5 |
| 1 | down | Button_Switch_SMD:SW_SPST_REED_CT05-XXXX-G1 | SW3 |
| 1 | misc | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J6 |
| 1 | misc | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J7 |
| 1 | ok | Button_Switch_SMD:SW_SPST_REED_CT05-XXXX-G1 | SW4 |
| 1 | power | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | SW1 |
| 1 | up | Button_Switch_SMD:SW_SPST_REED_CT05-XXXX-G1 | SW2 |
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Questions
How big is the LCRmeter PCB?
It measures 64 × 55.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LCRmeter use?
70 parts, built around the 74LVC1G66GW, 74HC14, LM1117MP-3.3 and BAT54S. 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 LCRmeter KiCad files?
From the ironiron/LCRmeter repository on GitHub, at the commit this page was made from: the board is LCRmeter_PCB/lcrmeter.kicad_pcb and its schematic LCRmeter_PCB/lcrmeter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LCRmeter design in my own project?
Its repository states no licence, so its author keeps all rights: ask ironiron before reusing the design.