# PDT20A BeagleBone THT Pulse Interface ## Description High-speed pulse interface board that conditions a 5 V, 50-500 ns PDT20A-HN pulse for safe 3.3 V detection by a BeagleBone Black while preserving timing integrity. ## Project Details - **Owner:** tolgaguver - **Created:** 4/18/2026 - **Last Updated:** 4/21/2026 - **Visibility:** Public ## Key Components ### D1 — [1N4148-1](https://www.flux.ai/gaby27/1n4148-1~89.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip - Role: Input Protection - Role Details: Fast steering/protection diode on the external pulse input path ahead of the Schmitt trigger input network. - Package: DO-35 - Part Type: Diode - Datasheet URL: https://www.mouser.com/datasheet/2/308/1N914_D-1801484.pdf - Manufacturer Part Number: 1N4148-1 **Pins:** - A [pin 2] - K [pin 1] ### J1 — [1-1337445-0](https://www.flux.ai/adrian95/1-1337445-0~ugo.md) - Manufacturer Name: TE Connectivity AMP Connectors - Manufacturer Part Number: 1-1337445-0 - Role: Pulse Input Connector - Part Type: Connector - Package: THT BNC Connector - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1337445&DocType=Customer+Drawing&DocLang=English - Role Details: Through-hole BNC input for PDT20A-HN pulse signal and ground return; easier hand soldering than the original SMA edge connector. - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [61300411121](https://www.flux.ai/adrian95/61300411121~pw9.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.we-online.com/components/products/datasheet/61300411121.pdf - Package: THT 1x4 2.54mm Header - Package or Case Code: HDRV4W95P0X254_1X4_1016X254X854P - Manufacturer Name: Wurth Elektronik - Role Details: Header carrying 5 V in, GND, conditioned pulse out, and optional raw input monitor/aux pin. - Role: BeagleBone Interface Header - Part Type: Connector - Manufacturer Part Number: 61300411121 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### U1 — [SN74HC14N](https://www.flux.ai/adrian95/sn74hc14n~p5r.md) - Role Details: Use two cascaded Schmitt inverter gates at 3.3V to condition the incoming PDT20A pulse and restore non-inverted logic for the BeagleBone Black. - Manufacturer Name: Texas Instruments - Role: Pulse Conditioner - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Package: PDIP-14 - Manufacturer Part Number: SN74HC14N - Datasheet URL: https://www.ti.com/lit/ds/symlink/sn74hc14.pdf **Pins:** - 1A [pin 1] - 1Y [pin 2] - 2A [pin 3] - 2Y [pin 4] - 3A [pin 5] - 3Y [pin 6] - 4A [pin 9] - 4Y [pin 8] - 5A [pin 11] - 5Y [pin 10] - 6A [pin 13] - 6Y [pin 12] - GND [pin 7] - VCC [pin 14] ### U2 — [MCP1700-3302E/TO](https://www.flux.ai/adrian95/mcp1700-3302eto~svz.md) - Role Details: Generate the local 3.3V rail from the 5V BeagleBone supply for the 74HC14 pulse-conditioning stage. - Role: LDO Regulator - Datasheet URL: {"value":"https://ww1.microchip.com/downloads/en/DeviceDoc/MCP1700-Data-Sheet-20001826F.pdf","type":"link","text":"https://ww1.microchip.com/downloads/en/DeviceDoc/MCP1700-Data-Sheet-20001826F.pdf"} - Package: TO-92-3 - Manufacturer Part Number: MCP1700-3302E/TO - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip **Pins:** - GND [pin 1] - VI [pin 2] - VO [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/tolgaguver/pdt20a-beaglebone-tht-pulse-interface~yv](https://www.flux.ai/tolgaguver/pdt20a-beaglebone-tht-pulse-interface~yv).* --- *Generated from [https://www.flux.ai/tolgaguver/pdt20a-beaglebone-tht-pulse-interface~yv](https://www.flux.ai/tolgaguver/pdt20a-beaglebone-tht-pulse-interface~yv)*