2 layers89 × 83 mm
2 layers51 × 58.9 mm
Tach
bistromath/tach2STM32F103-driven tachometer firmware.
- Size
- 51 × 58.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 92
- Nets
- 83
- Pads
- 315
- Tracks, vias
- 713, 66
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 29 Aug 2014
- Updated
- 13 Jul 2025
Overview
Tach is an open-source printed circuit board by bistromath, from the bistromath/tach repository on GitHub. It is a 2-layer board of 51 × 58.9 mm with 92 parts on 83 nets, routed with 713 tracks and 66 vias.
It is built around the 74ABT126D, LM2840XQMK and TMP20AIDCK, with the LM27762DSS, BAS40-04 and B340A-13-F-MS among its other parts. Its parts include 42 capacitors, 21 resistors, 9 ICs, 7 connectors and 5 diodes. It belongs with the STM32 boards of this library.
Main components
8
74ABT126D
SO-14-40℃~+85℃ 1 250uA 32mA 3ns@5V,50pF 4 4.5V~5.5V 64mA 74ABT Tri-State Unidirectional SO-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
LM2840XQMK
TSOT-23-6-40℃~+125℃@(TA) 1 1.35mA 100mA 4.5V~42V 550kHz Adjustable Buck Buck Built-in No TSOT-23-6 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
TMP20AIDCK
SC-70-5-55℃~+130℃ 2.7V~5.5V 4uA ±0.5℃ SC-70-5 Temperature Sensors ROHSTexas InstrumentsTemperature Sensors
LM27762DSS
WSON-12-EP(2x3)-40℃~+85℃ -5V~-1.5V、1.5V~5V 2.5Ω 2.7V~5.5V 250mA 2MHz 390uA Inverted Support WSON-12-EP(2x3) Charge Pumps ROHSTexas InstrumentsCharge Pumps
BAS40-04
SOT-23Schottky Diodeshongjiacheng
B340A-13-F-MS
SMA-65℃~+125℃ 1 Independent 1mA 3A 40V 700mV@2A SMA Schottky Diodes ROHSMSKSEMISchottky Diodes
FTSH-105-01-L-DV-007-K
SMD,P=1.27mm-55℃~+125℃ 1.27mm 10P 2 2x5P 3.05mm 3.4A Black Gold Phosphor bronze Pin Header Surface Mount,Vertical SMD,P=1.27mm Pin Headers ROHSSamtecPin Headers
XF2M-1415-1A
SMD,P=0.5mm,卧贴-30℃~+85℃ 0.3mm 0.5mm 14P 2.1mm Copper alloy Double-Sided Contacts, Top and Bottom Entry Gold Surface Mount, Right Angle SMD,P=0.5mm,卧贴 FFC, FPC (Flat Flexible) Connector Assemblies ROHSOmronFFC, FPC (Flat Flexible) Connector Assemblies
Parts
92| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 0.1/10 | Capacitors_SMD:C_0402 | C7, C19, C20, C22, C23, C24, C26, C28, C40 |
| 7 | 10k | Resistors_SMD:R_0402 | R1, R3, R4, R5, R6, R7, R11 |
| 6 | 1.0/10 | Capacitors_SMD:C_0402 | C9, C13, C30, C31, C39, C41 |
| 6 | 10/10 | Capacitors_SMD:C_0805 | C18, C25, C35, C36, C37, C38 |
| 4 | 0.01/10 | Capacitors_SMD:C_0402 | C4, C5, C12, C42 |
| 4 | Conn_01x01 | footprints:mountinghole-1.5mm | J2, J3, J6, J7 |
| 3 | BAS40-04 | TO_SOT_Packages_SMD:SOT-23 | D1, D3, D4 |
| 3 | Thermistor_PTC | Resistors_SMD:R_0603 | TH1, TH2, TH3 |
| 2 | 0.01/25 | Capacitors_SMD:C_0402 | C2, C3 |
| 2 | 0.1/16 | Capacitors_SMD:C_0402 | C1, C6 |
| 2 | 18p | Capacitors_SMD:C_0402 | C16, C17 |
| 2 | 2.2/10 | Capacitors_SMD:C_0402 | C8, C14 |
| 2 | 22/10 | Capacitors_SMD:C_0805 | C27, C29 |
| 2 | 4.7k | Resistors_SMD:R_0402 | R13, R14 |
| 2 | 73.2k | Resistors_SMD:R_0402 | R19, R20 |
| 2 | MountingHole | footprints:MountingHole_M3 | H1, H2 |
| 1 | 0.022/50 | Capacitors_SMD:C_0402 | C10 |
| 1 | 0.1/25 | Capacitors_SMD:C_0402 | C33 |
| 1 | 0.1/50 | Capacitors_SMD:C_0402 | C15 |
| 1 | 0.47/35 | Capacitors_SMD:C_0603 | C21 |
| 1 | 1.0/10 | Capacitors_SMD:C_0805 | C34 |
| 1 | 1.54k | Resistors_SMD:R_0402 | R15 |
| 1 | 10/50 | Capacitors_SMD:C_1206 | C11 |
| 1 | 124k | Resistors_SMD:R_0402 | R18 |
| 1 | 127k | Resistors_SMD:R_0402 | R17 |
| 1 | 151k | Resistors_SMD:R_0402 | R9 |
| 1 | 16MHz | Crystals:Crystal_SMD_TXC_7M-4pin_3.2x2.5mm | Y1 |
| 1 | 18.2k 0.1% | Resistors_SMD:R_0402 | R21 |
| 1 | 1k | Resistors_SMD:R_0402 | R10 |
| 1 | 2.2k 0.1% | Resistors_SMD:R_0805 | R2 |
| 1 | 4.7/10 | Capacitors_SMD:C_0603 | C32 |
| 1 | 634k | Resistors_SMD:R_0402 | R12 |
| 1 | 74ABT126 | Housings_SSOP:TSSOP-14_4.4x5mm_Pitch0.65mm | U8 |
| 1 | 8.45k | Resistors_SMD:R_0402 | R16 |
| 1 | 80.6k 0.1% | Resistors_SMD:R_0402 | R8 |
| 1 | B340A-13-F | Diodes_SMD:D_SMA | D5 |
| 1 | FTSH-105-01-L-DV-007-K | footprints:FTSH-105-01-L-DV-007-K | J5 |
| 1 | LM27762 | footprints:WSON-12-1EP_3x2mm_Pitch0.5mm_ThermalVias | U7 |
| 1 | LM2840X | TO_SOT_Packages_SMD:TSOT-23-6 | U4 |
| 1 | LM2937xMP-3.3 | TO_SOT_Packages_SMD:SOT-223-3_TabPin2 | U5 |
| 1 | LPS5030/15uH | footprints:MSS6132T | L1 |
| 1 | LTC2053 | Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm | U3 |
| 1 | MMBT3904-7-F | TO_SOT_Packages_SMD:SOT-23 | Q1 |
| 1 | REF5025ADGK | Housings_SSOP:MSOP-8_3x3mm_Pitch0.65mm | U2 |
| 1 | STM32F103CBTx | Housings_QFP:LQFP-48_7x7mm_Pitch0.5mm | U6 |
| 1 | SZMMBZ5222BLT1G | TO_SOT_Packages_SMD:SOT-23 | D2 |
| 1 | Screw_Terminal_01x02 | Connectors_Terminal_Blocks:TerminalBlock_bornier-2_P5.08mm | J1 |
| 1 | TMP20AIDCK | TO_SOT_Packages_SMD:SOT-353_SC-70-5 | U1 |
| 1 | X27.589 | footprints:X27.589 | U10 |
| 1 | XF2M-1415-1A | footprints:XF2M-1415-1A | J4 |
Questions
How big is the Tach PCB?
It measures 51 × 58.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Tach use?
92 parts, built around the 74ABT126D, LM2840XQMK, TMP20AIDCK and LM27762DSS. 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 Tach KiCad files?
From the bistromath/tach repository on GitHub, at the commit this page was made from: the board is pcbr2/tach/tach.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tach design in my own project?
Its repository states no licence, so its author keeps all rights: ask bistromath before reusing the design.
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