2 layers53 × 39 mm
Heartbeat Logger
Utstumo/Heartbeat-Logger
A small, portable device that will continuously log your ECG - the "waveform" of your heart - onto a memory card for analysis.
78 parts4
4 layers92.3 × 40.5 mm
Surtr LMMKI
PFMRLIB/Surtr-LMPrecision Reference with 10.5V/1.05V Output Based on LM399/ADR1399
- Size
- 92.3 × 40.5 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 93
- Nets
- 62
- Pads
- 316
- Tracks, vias
- 352, 362
- Pours
- 80
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Jul 2025
- Updated
- 12 Jul 2025
Overview
Surtr LMMKI is an open-source printed circuit board by PFMRLIB, from the PFMRLIB/Surtr-LM repository on GitHub, published under the BSD-3-Clause-Clear licence. It is a 4-layer board of 92.3 × 40.5 mm with 93 parts on 62 nets, routed with 352 tracks and 362 vias.
It is built around the OPA189IDBV, LT8336EV#PBF and OPA2189IDGK, with the TPS70933DBVR-MS, NX3008PBKW and 1N5819WS among its other parts. Its parts include 38 capacitors, 24 resistors, 7 ICs, 6 diodes and 3 transistors.
Main components
8
OPA189IDBV
SOT-23-5-18V~-2.25V、2.25V~18V -40℃~+125℃ 1 1.3mA 140pA 14MHz 168dB 20V/us 4.5V~36V 400nV 5.2nV/√Hz@1kHz 5nV/℃ 65mA 70pA EMI filtering/RF suppression、Zero drift / auto-zero、ESD protection、Reverse-phase input protection Rail-to-rail output SOT-23-5 Precision Op Amps ROHSTexas InstrumentsPrecision Op Amps
LT8336EV#PBF
LQFN-16(3x3)-40℃~+125℃@(TJ) 1 2.5A 2.7V~40V 2.7V~40V 3MHz 4uA Adjustable Boost Boost Built-in Yes LQFN-16(3x3) DC-DC Converters ROHSAnalog DevicesDC-DC Converters
OPA2189IDGK
MSOP8Dual 36V, Precision, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Operational Amplifier with e-trim™Texas InstrumentsUncategorisedTPS70933DBVR-MS
SOT-23-5SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIUncategorised
NX3008PBKW
SOT-323MOSFETsTECH PUBLIC
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky DiodesNX3008NBKW
SC-70-55℃~+150℃ 1 N-channel 1.1V 1.4Ω@4.5V 2.2pF 30V 350mA 50pF 6.5pF 680pC@4.5V 830mW N-Channel SC-70 MOSFETs ROHSNexperiaMOSFETs
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
README.mdProject Surtr LM-MK.I
10.5V/1.05V Reference based on LM399/ADR1399 (Need to be updated)
Parts
93| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 10uF | Capacitor_SMD:C_1206_3216Metric | C1, C4, C6, C15, C17, C25, C27, C33, C36 |
| 7 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C3, C7, C9, C19, C23, C31, C32 |
| 4 | 0R | Resistor_SMD:R_0603_1608Metric | R7, R16, R17, R22 |
| 4 | 10kR | Resistor_SMD:R_0603_1608Metric | R19, R23, R24, R27 |
| 4 | 1uF | Capacitor_SMD:C_0603_1608Metric | C10, C20, C21, C35 |
| 4 | 47uF/EC | Capacitor_Tantalum_SMD:CP_EIA-7343-30_AVX-N | C24, C28, C37, C38 |
| 3 | 220R | Resistor_SMD:R_0603_1608Metric | R20, R26, R28 |
| 3 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C13, C30, C34 |
| 3 | BLM21 | Inductor_SMD:L_0805_2012Metric | FB1, FB2, FB3 |
| 3 | GREEN | LED_SMD:LED_0603_1608Metric | D4, D5, D6 |
| 2 | 100uF | Capacitor_Tantalum_SMD:CP_EIA-7343-30_AVX-N | C2, C5 |
| 2 | 100uF/Poly | Capacitor_Tantalum_SMD:CP_EIA-7343-30_AVX-N | C8, C22 |
| 2 | 10nF | Capacitor_SMD:C_0603_1608Metric | C16, C18 |
| 2 | 12kR | Resistor_SMD:R_0603_1608Metric | R18, R25 |
| 2 | 1MR | Resistor_SMD:R_0603_1608Metric | R3, R12 |
| 2 | 330pF | Capacitor_SMD:C_0603_1608Metric | C11, C14 |
| 2 | Banana/Red | Connector:Banana_Jack_1Pin | TP1, TP2 |
| 2 | NC | Resistor_SMD:R_0603_1608Metric | R15, R21 |
| 2 | NX3008PBKW | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1, Q2 |
| 1 | 10uH/2A | Inductor_SMD:L_Sunlord_MWSA0402S | L2 |
| 1 | 1N5819WS | Diode_SMD:D_SOD-323 | D2 |
| 1 | 1kR/Film | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 1uH/2A | Inductor_SMD:L_1210_3225Metric | L1 |
| 1 | 200kR/Film | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 22uF | Capacitor_SMD:C_1210_3225Metric | C29 |
| 1 | 22uF | Capacitor_Tantalum_SMD:CP_EIA-7343-30_AVX-N | C12 |
| 1 | 287kR | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 4.7pF | Capacitor_SMD:C_0603_1608Metric | C26 |
| 1 | 47.5kR | Resistor_SMD:R_0603_1608Metric | R11 |
| 1 | 470R | Resistor_SMD:R_0603_1608Metric | R13 |
| 1 | 49.9kR | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 71.5kR | Resistor_SMD:R_0603_1608Metric | R14 |
| 1 | BZX384-?3V3 | Diode_SMD:D_SOD-323 | D3 |
| 1 | Banana/Black | Connector:Banana_Jack_1Pin | TP3 |
| 1 | LM399 | Package_TO_SOT_THT:Analog_TO-46-4_ThermalShield | U1 |
| 1 | LOGO | logo:lt_logo | G*** |
| 1 | LT5400-4 | LT5400:SOP65P490X110-9N | RN1 |
| 1 | LT5400-8 | LT5400:SOP65P490X110-9N | RN2 |
| 1 | LT8336EV#PBF | LT8336EV:LT8336EVPBF | U4 |
| 1 | NX3008NBKW | Package_TO_SOT_SMD:SOT-323_SC-70 | Q3 |
| 1 | OPA189IDBV | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | OPA2189IDGK | Package_SO:VSSOP-8_3x3mm_P0.65mm | U3 |
| 1 | PTC Fuse | Fuse:Fuse_2920_7451Metric | F1 |
| 1 | PTVS20S1UR | Diode_SMD:Nexperia_CFP3_SOD-123W | D1 |
| 1 | TPS25730D | Package_DFN_QFN:Texas_REF0038A_WQFN-38-2EP_6x4mm_P0.4 | U5 |
| 1 | TPS70933DBVR | TPS70933DBVR:SOT95P280X145-5N | U6 |
| 1 | TPS7A4701xRGW | Package_DFN_QFN:Texas_RGW0020A_VQFN-20-1EP_5x5mm_P0.65mm_EP3.15x3.15mm_ThermalVias | U7 |
| 1 | TYPE-C-31-M-12 | TYPE-C-31-M-12:HRO_TYPE-C-31-M-12 | J1 |
The 91 most common of 93 parts.
Questions
How big is the Surtr LMMKI PCB?
It measures 92.3 × 40.5 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Surtr LMMKI use?
93 parts, built around the OPA189IDBV, LT8336EV#PBF, OPA2189IDGK and TPS70933DBVR-MS. 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 Surtr LMMKI KiCad files?
From the PFMRLIB/Surtr-LM repository on GitHub, at the commit this page was made from: the board is Surtr_LMMKI.kicad_pcb and its schematic Surtr_LMMKI.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Surtr LMMKI design in my own project?
Its repository publishes it under the BSD-3-Clause-Clear licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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