# Remarkable Harlequin Gadget Copter ## Description Isolated PLC-to-LVDS interface board with one trigger output, two LVDS status return channels, DB9 field connector, selectable 5 V or 24 V trigger conditioning, and protected 24 V power input. ## Project Details - **Owner:** andrewjgood - **Created:** 4/27/2026 - **Last Updated:** 4/30/2026 - **Visibility:** Public ## Key Components ### D1 — [MBRA140T3G](https://www.flux.ai/adrian95/mbra140t3g~crb.md) - Manufacturer Name: ON Semiconductor - Role: Reverse Protection - Package: SMA - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mbra140t3-d.pdf - Manufacturer Part Number: MBRA140T3G - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Role Details: Series Schottky diode providing reverse polarity protection on the 24V input path **Pins:** - ANODE [pin 1] - CATHODE [pin 2] ### D2 — [SMBJ33A-13-F](https://www.flux.ai/lcsc/smbj33a-13-f~jw2e.md) - Package or Case Code: SMB_L4.6-W3.6-LS5.3-RD - Role: Surge Protection - Role Details: TVS clamp on the 24V field input after fuse and reverse-polarity protection - Package: SMB - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Diodes-Incorporated-SMBJ33A-13-F_C135067.pdf - LCSC Part Number: C135067 - Manufacturer Part Number: SMBJ33A-13-F - Manufacturer Name: DIODES(美台) - Part Type: TVS - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/TVS_DIODES_SMBJ33A-13-F_SMBJ33A-13-F_C135067.html **Pins:** - A [pin 2] - K [pin 1] ### F1 — [SMD050F-2](https://www.flux.ai/adrian95/smd050f-2.md) - Part Type: Circuit Protection Devices - Datasheet URL: https://www.littelfuse.com/assetdocs/littelfuse-ptc-smd-datasheet?assetguid=e664881a-0c68-4836-928b-7ed2f0c2a6da - Role: Input Protection - License: https://creativecommons.org/licenses/by/4.0/ - Package: 1812 - Manufacturer Name: Littelfuse - Manufacturer Part Number: SMD050F-2 - Mount: Surface Mount - Role Details: Resettable fuse on the 24V field power input **Pins:** - ~ [pin 2] - ~ [pin 1] ### IC1 — [SN65LVDS1DBVR](https://www.flux.ai/jecstronic/sn65lvds1dbvr~z7e.md) - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Fsn65lvds1 - Role Details: Single-channel LVDS driver for the trigger output pair on DB9 pins 3 and 8 - Manufacturer Name: Texas Instruments - Part Type: Integrated Circuit - Role: LVDS Driver - Manufacturer Part Number: SN65LVDS1DBVR - License: https://creativecommons.org/licenses/by/4.0/ - Package: SOT-23-5 **Pins:** - GND [pin 2] - IN [pin 5] - OUT- [pin 3] - OUT+ [pin 4] - VDD [pin 1] ### IC2 — [VO4661-X007T](https://www.flux.ai/adrian95/vo4661-x007t~bt4.md) - Datasheet URL: https://www.arrow.com/en/products/vo4661-x007t/vishay?region=nac - Package: SMD Optocoupler - Part Type: Isolator - Role Details: High-speed logic optocoupler isolating the PLC trigger input before the LVDS driver - Role: Trigger Isolator - Manufacturer Part Number: VO4661-X007T - Manufacturer Name: Vishay - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: SOP254P1005X465-8N **Pins:** - A1 [pin 1] - A2 [pin 4] - C1 [pin 2] - C2 [pin 3] - GND [pin 5] - VCC [pin 8] - VO1 [pin 7] - VO2 [pin 6] ### J1 — [L77SDE09SA4CH4F48](https://www.flux.ai/adrian95/l77sde09sa4ch4f48~1y0.md) - Package: DE-9 - Role Details: DB9 female connector carrying one trigger LVDS pair, two return LVDS pairs, one spare pair, and signal ground - Manufacturer Part Number: L77SDE09SA4CH4F48 - Manufacturer Name: Amphenol ICC (Commercial Products) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role: Field Connector - Package or Case Code: AMPHENOL_L77SDE09SA4CH4F48 - Datasheet URL: https://cdn.amphenol-cs.com/media/wysiwyg/files/documentation/datasheet/inputoutput/io_d_sub_sd_stamped_formed_right_angle_board.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] - SHIELD [pin SH1] - SHIELD__1 [pin SH2] ### J2 — [1729160](https://www.flux.ai/adrian95/1729160~ov.md) - Datasheet URL: http://www.phoenixcontact.com/de/produkte/1729160/pdf - Package: Terminal Block 5.08mm TH - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Phoenix Contact - Role Details: Terminal block for +24V, 0V, trigger input, frame-enable output, and frame-sync output wiring to the Beckhoff PLC - Manufacturer Part Number: 1729160 - Role: PLC Connector - Part Type: Connector - Package or Case Code: 1729160 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### JP2 — [61300311021](https://www.flux.ai/adrian95/61300311021~b2y.md) - Role: Configuration Header - Manufacturer Part Number: 61300311021 - Package or Case Code: HDRRA3W79P0X254_1X3_762X254X269P - Package: 1x3 2.54mm TH - Datasheet URL: https://www.we-online.com/components/products/datasheet/61300311021.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Wurth Elektronik - Role Details: Jumper header selecting direct or inverted trigger logic into the LVDS driver - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### JP3 — [61300311021](https://www.flux.ai/adrian95/61300311021~b2y.md) - Package: 1x3 2.54mm TH - Package or Case Code: HDRRA3W79P0X254_1X3_762X254X269P - Manufacturer Part Number: 61300311021 - Part Type: Connector - Role: Configuration Header - Manufacturer Name: Wurth Elektronik - Role Details: Jumper header selecting the 5V or 24V trigger input conditioning resistor path - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.we-online.com/components/products/datasheet/61300311021.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### PS1 — [ISU0248S05](https://www.flux.ai/jecstronic/isu0248s05~2sy.md) - Datasheet URL: https://www.xppower.com/portals/0/pdfs/SF_ISU02.pdf - Manufacturer Part Number: ISU0248S05 - Manufacturer Name: XP Power - Role Details: Creates the isolated 5V field-side supply from the protected 24V input - Part Type: DCDC Converter - Role: Isolated Converter - Package: SMD Isolated DC-DC Module **Pins:** - -VIN [pin 1] - -VOUT [pin 9] - +VIN [pin 14] - +VOUT [pin 8] - NC [pin 7] - NC [pin 6] - ON/~OFF [pin 2] ### Q1 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g~s5.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MMBT3904LT1G - Role: Logic Inverter - Role Details: Inverts the isolated trigger logic so JP2 can select normal or inverted polarity - Manufacturer Name: onsemi - Package: SOT-23-3 - Part Type: Transistor - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q2 — [MMBT3906-7-F](https://www.flux.ai/jecstronic/mmbt3906-7-f~d69.md) - Package: SOT-23-3 - Manufacturer Part Number: MMBT3906-7-F - Part Type: Transistor - Role Details: PNP high-side transistors generating PLC-compatible 24V sourcing outputs for frame-enable and frame-sync - License: https://creativecommons.org/licenses/by/4.0/ - Role: PLC Output Driver - Manufacturer Name: Diodes Incorporated - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Diodes%20PDFs/MMBT3906.pdf **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### Q3 — [MMBT3906-7-F](https://www.flux.ai/jecstronic/mmbt3906-7-f~d69.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: MMBT3906-7-F - Part Type: Transistor - Role: PLC Output Driver - Manufacturer Name: Diodes Incorporated - Role Details: PNP high-side transistors generating PLC-compatible 24V sourcing outputs for frame-enable and frame-sync - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Diodes%20PDFs/MMBT3906.pdf - Package: SOT-23-3 **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### U1 — [MCP1703Ax-330xxTT](https://www.flux.ai/kicad-part-library/mcp1703ax-330xxtt~9wn.md) - Role: LDO - Manufacturer Part Number: MCP1703Ax-330xxTT - Datasheet URL: http://ww1.microchip.com/downloads/en/DeviceDoc/20005122B.pdf - Manufacturer Name: Microchip Technology Inc. - Role Details: Drops isolated 5V to 3.3V for LVDS devices and logic-side optocoupler outputs - Package or Case Code: SOT-23 - Package: SOT-23 **Pins:** - GND [pin 1] - VI [pin 3] - VO [pin 2] ### U2 — [DS90C402](https://www.flux.ai/kicad-part-library/ds90c402~27y.md) - Datasheet URL: http://www.ti.com/lit/ds/symlink/ds90c402.pdf - Package: SOIC-8 - Manufacturer Part Number: DS90C402 - Package or Case Code: SOIC-8_3.9x4.9mm_P1.27mm - Role Details: Dual LVDS receiver for frame-enable and frame-sync return pairs from the DB9 connector - Role: LVDS Receiver - Manufacturer Name: Texas Instruments Inc. **Pins:** - GND [pin 5] - RI1- [pin 4] - RI1+ [pin 3] - RI2- [pin 8] - RI2+ [pin 7] - RO1 [pin 2] - RO2 [pin 6] - VCC [pin 1] ### U3 — [FOD8173SD](https://www.flux.ai/lcsc/fod8173sd~sxvs.md) - Package: SMD-4 - Role Details: Phototransistor optocouplers transferring the two LVDS receiver logic outputs back to the PLC-side 24V output stages - Role: Status Isolator - Package or Case Code: SMD-4_L4.6-W6.5-P2.54-LS10.2-BL - LCSC Part Number: C463969 - Manufacturer Name: onsemi(安森美) - Manufacturer Part Number: FOD8173SD - Part Type: Optocouplers - Phototransistor Output **Pins:** - AN [pin 1] - CAT [pin 2] - COL [pin 4] - EM [pin 3] ### U4 — [FOD8173SD](https://www.flux.ai/lcsc/fod8173sd~sxvs.md) - Role Details: Phototransistor optocouplers transferring the two LVDS receiver logic outputs back to the PLC-side 24V output stages - Package: SMD-4 - Manufacturer Name: onsemi(安森美) - Manufacturer Part Number: FOD8173SD - Part Type: Optocouplers - Phototransistor Output - Role: Status Isolator - LCSC Part Number: C463969 - Package or Case Code: SMD-4_L4.6-W6.5-P2.54-LS10.2-BL **Pins:** - AN [pin 1] - CAT [pin 2] - COL [pin 4] - EM [pin 3] ### U5 — [SRDA05-6.TBT](https://www.flux.ai/baueralex174/srda05-6ptbt~qq.md) - Role Details: Low-capacitance multi-line TVS array protecting the LVDS pairs at the DB9 connector - Package or Case Code: SOIC127P600X170-9N - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SRDA3.3-6.TBT - Role: ESD Protection - Part Type: SRDA3.3-6.TBT - Compliance: Pb-Free,Halogen Free,RoHS/WEEE Compliant - Package: SO-8 - Manufacturer Name: Semtech Corporation - Datasheet URL: https://www.semtech.com/uploads/documents/SRDA3.3-6.pdf **Pins:** - GND [pin 8] - I/O 1 [pin 1] - I/O 2 [pin 2] - I/O 3 [pin 4] - I/O 4 [pin 5] - I/O 5 [pin 6] - I/O 6 [pin 7] - VREF [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/andrewjgood/remarkable-harlequin-gadget-copter~9f](https://www.flux.ai/andrewjgood/remarkable-harlequin-gadget-copter~9f).* --- *Generated from [https://www.flux.ai/andrewjgood/remarkable-harlequin-gadget-copter~9f](https://www.flux.ai/andrewjgood/remarkable-harlequin-gadget-copter~9f)*