# T-Mech prototyp_v2 ad7a bd1mar2026 ## Description T-Mech prototyp_v2 - High current fan test fixture (5.0mm power traces, GND_MOC heatsink pour, star ground at 1000uF cap) ## Project Details - **Owner:** hopflik - **Created:** 3/1/2026 - **Last Updated:** 3/14/2026 - **Visibility:** Public - **Voltage:POWER_GND:** 0V - **Voltage:LOGIC_GND:** 0V - **Voltage:12V_INPUT:** 12V - **System Architecture:** flowchart TD subgraph CONTROL_BOARD [CONTROL BOARD] U1[ESP32-C3] J1[OLED 4pin] U3[Encoder] J6[Expansion 1x6] BUZ[Active buzzer] LED1[PWM LED] J7[J7 6pin interconnect] end subgraph POWER_BOARD [POWER BOARD] J4[J4 12V input] F1[Fuse] D10A10[10A10 diode] D1[TVS 1.5KE18CA] PS_HW155[HW-155 buck] ACS[ACS712 current sensor] DIV[Voltage divider] NTC[NTC temp sense] J5[J5 load] J8[J8 6pin interconnect] C1[C1 bulk cap star point] end J7 -->|+5V| J8 J7 -->|3V3| J8 J7 -->|LOGIC_GND| J8 J7 -->|PWM_SIGNAL| J8 J7 -->|AMPS_SENSE| J8 J7 -->|VOLTS_SENSE| J8 J4 --> F1 --> D10A10 --> PS_HW155 J4 --> D1 J5 --> ACS DIV --> J8 ACS --> J8 NTC --> J8 C1 -->|STAR_GND| J8 - **Voltage:+5V:** 5V - **Placement Note - USB-C:** Place USB-C connector along enclosure edge; keep connector shell flush to board edge and align with enclosure cutout. Ensure adequate keepout around connector and cable bend radius. - **Copies:** 1 ## Key Components ### D1 — [1.5KE18CA](https://www.flux.ai/lcsc/1p5ke18ca.md) - Role Details: TVS diode across 12V_INPUT to POWER_GND - Role: Protection - JLCPCB Part Class: Extended Part - Datasheet URL: https://assets.lcsc.com/datasheet/szlcsc/Download-ISO9001-Certification.pdf - LCSC Part Number: C696647 - Package or Case Code: DO-201_BD5.3-L9.5-P13.50-D1.4-BI - Manufacturer Name: SEMIWARE - Manufacturer Part Number: 1.5KE18CA - Part Type: TVS - Product Info Url: https://lcsc.com/product-detail/TVS_SEMIWARE-1-5KE18CA_C696647.html - Package: DO-201 **Pins:** - 1 [pin 1] - 2 [pin 2] ### D3 — [10A10](https://www.flux.ai/lcsc/10a10.md) - Role Details: Series reverse polarity protection diode after fuse, before buck input. - Product Info Url: https://lcsc.com/product-detail/Diodes-General-Purpose_Chongqing-Pingwei-Tech-10A10_C360420.html - Package: R-6 - Manufacturer Part Number: 10A10 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302301_Chongqing-Pingwei-Tech-10A10_C360420.pdf - LCSC Part Number: C360420 - Manufacturer Name: PINGWEI(平伟) - Role: Protection - Package or Case Code: R-6_BD8.9-L8.9-P12.90-D1.3-RD - Part Type: Diodes - General Purpose - JLCPCB Part Class: Extended Part **Pins:** - - [pin 1] - + [pin 2] ### F1 — [Fuseholder Cylinder 5x20mm](https://www.flux.ai/adrian95/fuseholder-cylinder-5x20mm.md) - Part Type: Fuse **Pins:** - P1 - P2 ### J1 — [Connector 01x04_2.00mm](https://www.flux.ai/jecstronic/connector-01x042p00mm.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J2 — [Pin Header 01x06 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x06-2p54mm-vertical.md) - Role: Interconnect - Package: Header_1x06_P2.54mm - Part Type: Connector - Role Details: CONTROL->POWER 6-pin interface (+5V,3.3V,GND,PWM_SIG,AMPS_SENSE,VOLTS_SENSE). - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### J3 — [Pin Header 01x06 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x06-2p54mm-vertical.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role: Interconnect - Role Details: POWER->CONTROL 6-pin interface (+5V,3.3V,GND,PWM_SIG,AMPS_SENSE,VOLTS_SENSE). - Part Type: Connector - Package: Header_1x06_P2.54mm **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### J4 — [KF45C-9.5-2P](https://www.flux.ai/jecstronic/kf45c-9p5-2p.md) - Datasheet URL: https://datasheet.lcsc.com/lcsc/2303311830_Cixi-Kefa-Elec-KF45C-9-5-2P_C707421.pdf - Manufacturer Name: Cixi Kefa Elec - Manufacturer Part Number: KF45C-9.5-2P - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J5 — [KF45C-9.5-2P](https://www.flux.ai/jecstronic/kf45c-9p5-2p.md) - Part Type: Connector - Manufacturer Part Number: KF45C-9.5-2P - Manufacturer Name: Cixi Kefa Elec - Datasheet URL: https://datasheet.lcsc.com/lcsc/2303311830_Cixi-Kefa-Elec-KF45C-9-5-2P_C707421.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J6 — [0901301106](https://www.flux.ai/adrian95/0901301106.md) - Part Type: Connector - Datasheet URL: https://tools.molex.com/pdm_docs/sd/901301106_sd.pdf - Role: Connector - Role Details: 6-pin expansion header - Package: Header_1x06_P2.54mm - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Molex - Manufacturer Part Number: 0901301106 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### J7 — [Pin Header 01x03 2.54mm Horizontal](https://www.flux.ai/adrian95/pin-header-01x03-254mm-horizontal.md) - Package: Header_1x03_P2.54mm - Role Details: ACS712 analog output to MCU; header provides VCC/OUT/GND. - Part Type: Connector - Role: Sensor - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] ### J9 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/pin-header-01x02-254mm-vertical.md) - Part Type: Connector - Package: Header_1x02_P2.54mm - Role: Connector - Role Details: 2-pin header for 5V LOGIC output (5V and GND) - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### LED1 — [TLHR5400](https://www.flux.ai/jecstronic/tlhr5400.md) - Datasheet URL: https://www.verical.com/datasheet/vishay-low-power-led--below-100ma--TLHR5400-402522.pdf - Manufacturer Part Number: TLHR5400 - Part Type: LED - Role: Indicator - Role Details: PWM status LED indicating PWM_LED activity; changed to 5mm through-hole LED. - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Vishay Semiconductor Opto Division - Package: THT_5mm **Pins:** - A [pin 2] - K [pin 1] ### LS1 — [TMB12A05](https://www.flux.ai/jecstronic/tmb12a05.md) - Datasheet URL: https://datasheet.lcsc.com/lcsc/2304261046_Jiangsu-Huaneng-Elec-TMB12A05_C96093.pdf - Manufacturer Part Number: TMB12A05 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Human Interface - Manufacturer Name: Jiangsu Huaneng Elec - Package: THT_12mm - Role Details: Active buzzer driven from BUZZER_SIG; changed to 12mm through-hole buzzer. - Part Type: Buzzer **Pins:** - N - P ### Q1 — [IRL3705NPBF](https://www.flux.ai/adrian95/irl3705npbf.md) - Role: PWM switch - Manufacturer Part Number: IRL3705NPBF - Manufacturer Name: Infineon Technologies - Package: TO-220 - Datasheet URL: https://www.infineon.com/dgdl/irl3705npbf.pdf?fileId=5546d462533600a40153565f31232534 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Role Details: Low-side MOSFET for LOAD_NEG driven by GPIO10 **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### SW1 — [KY-040](https://www.flux.ai/jecstronic/ky-040.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Module - Datasheet URL: https://www.epitran.it/ebayDrive/datasheet/25.pdf - Datasheet URL: https://components101.com/sites/default/files/component_datasheet/KY-04-Rotary-Encoder-Datasheet.pdf - Manufacturer Part Number: KY-040 **Pins:** - CLK [pin 1] - DT [pin 2] - GND [pin 5] - SW [pin 3] - VCC(+) [pin 4] ### U1 — [ESP32-C3 SuperMini](https://www.flux.ai/jecstronic/esp32-c3-supermini.md) - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-mini-1_datasheet_en.pdf - Manufacturer Part Number: ESP32-C3_SUPERMINI - Manufacturer Name: Texas Instruments Inc. - Part Type: Module - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 3V3 [pin 3.3] - 5V [pin 5V] - GND [pin G] - GPIO0 [pin 0] - GPIO1 [pin 1] - GPIO10 [pin 10] - GPIO2 [pin 2] - GPIO20 [pin 20] - GPIO21 [pin 21] - GPIO3 [pin 3] - GPIO4 [pin 4] - GPIO5 [pin 5] - GPIO6 [pin 6] - GPIO7 [pin 7] - GPIO8 [pin 8] - GPIO9 [pin 9] ### U2 — [EL4N35](https://www.flux.ai/lcsc/el4n35.md) - Manufacturer Part Number: EL4N35 - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_1810010131_Everlight-Elec-EL4N35_C141786.pdf - JLCPCB Part Class: Extended Part - Manufacturer Name: EVERLIGHT(亿光) - LCSC Part Number: C141786 - Package or Case Code: DIP-6_L7.3-W6.5-P2.54-LS7.6-BL - Product Info Url: https://lcsc.com/product-detail/DIP-Optocouplers_EL4N35_C141786.html - Part Type: Optocouplers - Phototransistor Output **Pins:** - 1 [pin 1] - 2 [pin 2] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - NC [pin 3] ### U3 — [MBR20100](https://www.flux.ai/lcsc/mbr20100.md) - LCSC Part Number: C3011076 - Part Type: Schottky Barrier Diodes (tht) - JLCPCB Part Class: Extended Part - Role Details: Flyback diode across J5, cathode to LOAD_POS, anode to LOAD_NEG. - Manufacturer Name: JUXING(钜兴) - Package: TO-220AB-3 - Role: Protection - Manufacturer Part Number: MBR20100 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/hopflik/t-mech-prototypv2-ad7a-bd1mar2026](https://www.flux.ai/hopflik/t-mech-prototypv2-ad7a-bd1mar2026).* --- *Generated from [https://www.flux.ai/hopflik/t-mech-prototypv2-ad7a-bd1mar2026](https://www.flux.ai/hopflik/t-mech-prototypv2-ad7a-bd1mar2026)*