Use Cases: PCB Design & Assembly , Learning & Planning
PCB Components
The following is a list of components used for the project.
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| PCB Component Designator (qualifier) | Description | Components # | Package | Comments | Order | Cost ($ ea /w shipping) | Pic |
|---|---|---|---|---|---|---|---|
| BR(n) | Bridge Rectifier | KBL406 | 4-Pin, PTH | Used by BOD Cards for conditioning DCC signal for current detection | AliExpress | 0.20 |  |
| C(n) | Capacitor-Ceramic | varies | SMD 1206 | Used for LED and IC protection, low cost, various values. | AliExpress | 0.02 |  |
| C(n) | Capacitor-Polymer Solid | 22uF, 100 uF | SMD 1206 | Used for power regulator circuit | AliExpress | 0.10 |  |
| D(n) | Diode-Schottky | SS310 | SMA | Used for power regulator and circuit protection | AliExpress | 0.02 |  |
| D(n) | TVS Diode | TVS SMAJ5A | SMA | Used by cards for TVS protection of GPIO pins (5 V) | AliExpress | 0.05 |  |
| D(n) | TVS Diode | SMBJ18A | SMB | Used by power module for TVS protection of Vcc input () | AliExpress | 0.05 | |
| D(n) | ESD Diode | PESD1CAN | SOT-23 SMD | Used on CAN Bus circuit for electrostatic discharge (ESD) protection | AliExpress | 0.05 |  |
| F(n) | PolyFuse | PPTC 1.5A, 3A | JK30, PTH | Protects from sustained overcurrent conditions by increasing resistance when the current exceeds 1.5A or 3A. Resets once the fault condition is cleared. | AliExpress | 0.05 |  |
| F(n) | PolyFuse | PPTC | 1206-0.2A (>5 V) SMD 1206-1.0A (>5 V) SMD |
Protects from sustained overcurrent conditions by increasing resistance when the current exceeds 0.2A or 1.0A. Resets once the fault condition is cleared. | AliExpress | 0.05 |  |
| F(n) | Fast Blow Fuse | 125 V 1808 3A | 0451 SMD | Fuse Holder for 3A 1808 fast blow fuses | AliExpress | 0.30 |  |
| FH(n) | Fuse Holder | 1808 | 0451, SMB | Protects Power-CAN Card and Node Card from >3A current | AliExpress | 0.15 |  |
| FB(n) | Ferrite Bead | BLM31PG121SN1L | SMD 1206 | Provides high-frequency noise suppression on the I2C lines. | AliExpress | 0.05 |  |
| J(n) | JST Socket | XH, Vertical or Right-Angle | 2.54mm, PTH | Used for connecting wires using a pre-wired JST XH plug. | AliExpress | 0.02 |  |
| J(n) | RJ45 Socket | 8P8C | PTH | Used for connecting network cables (CAT5/6). Ensure hole arrangement matches PCB | AliExpress | 0.16 |  |
| J(n) | Edge Card Connector | 805 Type A, 12P (2x6) | 3.56mm, PTH | Used by Node Bus Hub for holding cards (PCB) | AliExpress | 1.00 |  |
| J(n) | Spring Terminal Block | Right Angle | 2.54mm, PTH | Used for connecting wires. Block can be assembled to any number of pins. | AliExpress | 0.20 (2p) |  |
| JP(n) | Female Header | Single Row, Female, short/long leg | 2.54mm, PTH | Use for mounting boards or modules, allowing for upgrades and removal of boards | AliExpress | 0.25 (19P) |  |
| JP(n) | Male Pin Header | Single Row, Male, Breakable | 2.54mm, PTH | Use for jumpers and connecting female headers. Pin style, not round hole. | AliExpress | 0.30 (40P) |  |
| K(n) | Relay, 12V, Dual Latching | DPDT, TQ2-L2-12 V, 1A | DIP-10, PTH | Used by Relay Breakout Board for switch 5V on/off | AliExpress | 0.40 |  |
| L(n) | Power Inductor | 33uH | PTH | Used for power regulator | AliExpress | 0.10 |  |
| LED(n) | LEDs | red, green, yellow | SMD 1206 | Used for indicators, various colors. Orientation: cathode is marked on back, flat side of green symbol. | AliExpress | 0.04 |  |
| Q(n) | NPN Transistor | IRLZ44N | TO-220, PTH | Mosfet NPN transistor for switching higher current using low current (signals) | AliExpress | 0.25 |  |
| Q(n) | NPN Transistor | BSS138 | SOT-23 SMD | Mosfet NPN transistor for switching higher current using low current (signals) | AliExpress | 0.02 |  |
| Q(n) | PNP Transistor | IRLML6402 | SOT233, SMD | Used by Battery Card to turn off power while charging | AliExpress | 0.05 |  |
| Q(n) | Darlington Transistor Array | TBD62083A | SOIC-18/SOP-18 SMD | Switch supply voltage to the output lines. | AliExpress | 1.20 |  |
| R(n) | Resistors | varies | SMD 1206 | Used for current limiting, low cost, various values. | AliExpress | 0.01 |  |
| SG(1) | Buzzer | 3V Active Buzzer | SMD 9650 | Used for audio alert of firmware warnings/errors | AliExpress | 0.30 |  |
| SW(n) | Slide Switch | DIP | 2.54mm, PTH | Slide / Toggle switch used for setting I2C and Vcc selections | AliExpress | 0.35 |  |
| SW(n) | Momentary Tact Button | 6x6x4.3mm | SMD | Used by cards for momentary connection. | AliExpress | 0.20 |  |
| U(n) | Analog to Digital Converter | ADS1115 | MSOP-10 SMD | Used to convert voltage from analog to digital. I2C enabled. Used by Node Card to read via I2C the Power-CAN Cardm voltage levels | AliExpress | 1.00 |  |
| U(n) | Audio Amp | MAX98357A | 16TQFN SMD | Used by Audio Card to amplifiy audio | AliExpress | 2.10 |  |
| U(n) | CAN Transceiver IC | SN65HVD233DR | SOP-8 SMD | Used for CAN communications by LCC Fusion Node Card | AliExpress | 1.00 |  |
| U(n) | Charging Circuit | MCP73831T | SMD | Used for charging Li-Po batteries by the Battery Card | AliExpress | 0.10 |  |
| U(n) | Darlington Transistor Array | M54562FP | SOP-20 SMD | Darlington Transistor Array | AliExpress | 1.00 |  |
| U(n) | Dual Full Bridge Driver | TB6612FNG | SSOP-24 SMD | Used by DC Motor Card to drive motors | AliExpress | 1.30 |  |
| U(n) | ESP32 | DevKit-C V4 /w ESP32-Wroom-32D | 19-pin Wide | Used by LCC Fusion Node Card for firmware | AliExpress | 3.20 |  |
| U(n) | ESP32 | SuperMini ESP32-S3 | 18-Pin, PTH | Used by Quad-Node Card for firmware | AliExpress | 4.25 |  |
| U(n) | Voltage Comparator | LM2903 | SO-8, SMD | Used to verify voltage is correct | AliExpress | 0.10 |  |
| U(n) | MOSFET Driver | TC4428 | SOP-8 SMD | MOSFET Driver for turnout out | AliExpress | 1.30 |  |
| U(n) | Nand Gate IC | 74HC00 | SOP-14 SMD | Nand Gate IC for turnout card | AliExpress | 0.12 |  |
| U(n) | Optocoupler | MCT6H | DIP-8, PTH | Used by BOD Card for detecting current with isolation of track current from board’s components | AliExpress | 0.60 |  |
| U(n) | Port Expander | MCP23017 | SSOP-28 SMD | Port expander, I2C connection. | AliExpress | 1.60 |  |
| U(n) | Schmitt Trigger | SN74HCT14 | DIP-14 PTH | Used by Button Card to clean input signals | AliExpress | 0.30 |  |
| VR(n) | Voltage Regulator | L7812CV | TO-220, PTH | 12 V Linear Voltage Regulator | AliExpress | 1.20 |  |
| VR(n) | Voltage Regulator | LM1117-3V3 | SOT-223 SMD | Used by LCC Fusion Node Card for power regulator | AliExpress | 0.40 |  |
| VR(n) | Voltage Regulator | LM2596S-ADJ (3A) | SMD | Used by DC Motor Card for selectable 5V or 12 V ouputt | AliExpress | 0.25 |  |
| VR(n) | Voltage Regulator | LM7805CV (1.5A) | TO-220, PTH | Used by Turnout Card(s) | AliExpress | 0.08 |  |