# NF-Dual Output Buck ## Description Best-effort NF-UNIVERSAL ALARM schematic recreation from image, with MCP73831 Li-ion charging, dual 555 timers, transistor switching, LEDs, switches, and flagged uncertainties. ## Project Details - **Owner:** fatenerris - **Created:** 5/22/2026 - **Last Updated:** 7/1/2026 - **Visibility:** Public - **Copies:** 1 ## Key Components ### DNP — [10kΩ 0603 Resistor](https://www.flux.ai/adrian95/10kohm-0603-resistor~yfg.md) - Resistance: 10kΩ - Manufacturer Name: Vishay - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: CRCW060310K0JNEAC - Datasheet URL: https://www.vishay.com/docs/28773/crcwce3.pdf - Package: SMD_0603_1608Metric - Part Type: Resistor **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [USB4215-03-A](https://www.flux.ai/adrian95/usb4215-03-a~kg3.md) - Manufacturer Name: GCT - Datasheet URL: https://gct.co/files/specs/usb4215-spec.pdf - Part Type: USB C - Role Details: GCT USB4215-03-A USB-C 2.0 receptacle used as 5V input for dual-output buck - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Role: USB-C Power Input - Manufacturer Part Number: USB4215-03-A - Package or Case Code: GCT_USB4215-03-A_REVA **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND_A [pin A1_B12] - GND_B [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin SH1] - SHIELD [pin SH4] - SHIELD [pin SH2] - SHIELD [pin SH3] - VBUS_A [pin A4_B9] - VBUS_B [pin B4_A9] ### J2 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Product Info Url: https://www.digikey.com/en/products/detail/sullins-connector-solutions/PCC02SAAN/4558522 - Connector Gender: Male - Role Details: PCC02SAAN-style unshrouded 1x2 vertical through-hole male header, 2.54 mm pitch; generic unshrouded footprint used because exact Flux library part is unavailable. - Digi-Key Part Number: 4558522 - Connector Pitch: 2.54mm - Connector Type: Headers and Wire Housings - Part Type: Connector - Connector Positions: 2 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Sullins Connector Solutions - Manufacturer Part Number: PCC02SAAN **Pins:** - P1 [pin 1] - P2 [pin 2] ### J3 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Connector Positions: 2 - Connector Gender: Male - Connector Type: Headers and Wire Housings - Product Info Url: https://www.digikey.com/en/products/detail/sullins-connector-solutions/PCC02SAAN/4558522 - Connector Pitch: 2.54mm - Manufacturer Part Number: PCC02SAAN - Digi-Key Part Number: 4558522 - Manufacturer Name: Sullins Connector Solutions - Role Details: PCC02SAAN-style unshrouded 1x2 vertical through-hole male header, 2.54 mm pitch; generic unshrouded footprint used because exact Flux library part is unavailable. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - P1 [pin 1] - P2 [pin 2] ### J4 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - Connector Pitch: 2.54mm - Connector Type: Headers and Wire Housings - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Sullins Connector Solutions - Connector Gender: Male - Manufacturer Part Number: PCC02SAAN - Product Info Url: https://www.digikey.com/en/products/detail/sullins-connector-solutions/PCC02SAAN/4558522 - Role Details: PCC02SAAN-style unshrouded 1x2 vertical through-hole male header, 2.54 mm pitch; generic unshrouded footprint used because exact Flux library part is unavailable. - Digi-Key Part Number: 4558522 - Connector Positions: 2 **Pins:** - P1 [pin 1] - P2 [pin 2] ### LED1 — [150060RS73220](https://www.flux.ai/vasy_skral/150060rs73220~kj9.md) - Manufacturer Name: Würth - Current: 2mA - Part Type: LED - Role: Current Limiting - Manufacturer Part Number: 150060RS73220 - Package or Case Code: D_0603_1608Metric - Role Details: Red 0603 USB_5V/input-present indicator LED; Digi-Key stocked part 732-11996-1-ND. - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060RS73220.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Digi-Key Part Number: 732-11996-1-ND - Forward Voltage: 2.0V **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [150060RS73220](https://www.flux.ai/vasy_skral/150060rs73220~kj9.md) - Role: Current Limiting - Digi-Key Part Number: 732-11996-1-ND - Manufacturer Part Number: 150060RS73220 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060RS73220.pdf - Role Details: Red 0603 3.3V rail indicator LED; Digi-Key stocked part 732-11996-1-ND. - Package or Case Code: D_0603_1608Metric - Forward Voltage: 2.0V - Current: 2mA - Manufacturer Name: Würth - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [150060RS73220](https://www.flux.ai/vasy_skral/150060rs73220~kj9.md) - Role Details: Red 0603 3.3V rail indicator LED; Digi-Key stocked part 732-11996-1-ND. - Role: Current Limiting - Digi-Key Part Number: 732-11996-1-ND - Manufacturer Part Number: 150060RS73220 - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060RS73220.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Current: 2mA - Manufacturer Name: Würth - Part Type: LED - Package or Case Code: D_0603_1608Metric - Forward Voltage: 2.0V **Pins:** - A [pin 2] - K [pin 1] ### U1 — TPS62402DRCT-DATASHEET-SYMBOL - Manufacturer Part Number: TPS62402DRCT - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps62402.pdf - LCSC Part Number: C2073323 - Role: Power Conversion - Role Details: Reverted custom TPS62402 datasheet-style symbol: VIN/EN_1/EN_2/MODE-DATA left, FB1/SW1/DEF_1/SW2/ADJ2/GND right. - Frequency: 2.25MHz - JLCPCB Part Class: Extended Part - Manufacturer Name: Texas Instruments - Package or Case Code: 10-VSON - Part Type: Integrated Circuits **Pins:** - ADJ2 [pin 1] - DEF_1 [pin 5] - EN_1 [pin 7] - EN_2 [pin 9] - EP [pin 11] - FB1 [pin 4] - GND [pin 8] - MODE/DATA [pin 2] - SW1 [pin 6] - SW2 [pin 10] - VIN [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/fatenerris/nf-dual-output-buck~cf](https://www.flux.ai/fatenerris/nf-dual-output-buck~cf).* --- *Generated from [https://www.flux.ai/fatenerris/nf-dual-output-buck~cf](https://www.flux.ai/fatenerris/nf-dual-output-buck~cf)*