RTB D20
About the RTB D20 PCB
RTB D20 is an open source PCB design by git4dcc, published on GitHub under the Apache-2.0 license. It is a 6-layer board measuring 14 × 8 mm, with 51 components from 29 distinct parts.
Other key parts include the AVR64DD28-I/STX, NCP730BMT330TBG and DRV8231ADSGR. By type, the board carries 19 resistors, 10 connectors, 9 capacitors, 6 transistors, 4 diodes and 3 ICs.
From the project
DCC / Railcom decoder (NEM651, double sided)
My Homebrew D20 decoder is a double sided mobile decoder with NEM-651 connector. The decoder is designed to integrate into the RTB digital control infrastructure.
- RTBD12 - custom (Fleischmann V100) - RTBD13 - custom (Minitrix coach) - RTBD15 - custom (Minitrix V160) - RTBD16 - NEM651 - RTBD21 - Next18 - RTBD22 - Plux16 - RTB_D23 - NEM652
The decoder has the following features, - NEM-651 connector - DCC - DCC-A automatic logon - DCC-R protocol extension - Service Mode Programming - Railcom - Channel 1/2 - POM, xPOM - DYN: Speed, QoS, Track-voltage, Motor-current, AUX-current, Temp…
Main components on the RTB D20
RTB D20 bill of materials (BOM)
51 components, 29 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AVR64DD28-I/STX AVR64DD28-I_STX | QFN-28-1EP_4x4mm_P0.4mm_EP2.3x2.3mm | IC1 |
| 1 | NCP730BMT330TBG NCP730BM | WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm_ThermalVias | IC2 |
| 1 | DRV8231ADSGR | SON50P200X200X80-9N | IC3 |
| 1 | BC847BDW1 | SOT-666 | Q1 |
| 1 | BC857BDW1 | SOT-666 | Q2 |
| 4 | PMZB200UNEYL | Diodes_DFN1006-3 | Q3, Q4, Q5, Q6 |
| 1 | NEM651 | PinHeader_1x06_P1.27mm_Horizontal | J1 |
| 2 | pad | DummyNet-Connector | J2, J9 |
| 1 | Capacitor | PinHeader_1x02_P1.27mm_Horizontal | J3 |
| 6 | Conn_01x01 | DummyNet-Connector | J4, J5, J6, J7, J8, J10 |
| 1 | LED | LED_0402_1005Metric | D1 |
| 1 | BAS3007ARPPE6327HTSA1 | BF998215 | D2 |
| 2 | BAT30F4 | BAT30F4 | D3, D4 |
| 1 | 22u/4V | C_0402_1005Metric | C1 |
| 1 | 10u/25V | C_0603_1608Metric | C2 |
| 2 | 100n | C_0402_1005Metric | C3, C5 |
| 1 | 22u/25V | C_0603_1608Metric | C4 |
| 1 | 1u | C_0402_1005Metric | C6 |
| 1 | 100n/50V | C_0603_1608Metric | C7 |
| 2 | 22u/6V | C_0402_1005Metric | C8, C9 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | 33k | R_0402_1005Metric | R1, R2, R15, R17 |
| 1 | 3.3k | R_0402_1005Metric | R3 |
| 1 | 22 | R_0402_1005Metric | R4 |
| 4 | 10k | R_0402_1005Metric | R5, R6, R11, R12 |
| 3 | 220k | R_0402_1005Metric | R7, R8, R14 |
| 2 | 9.1k | R_0402_1005Metric | R9, R10 |
| 1 | 1k | R_0402_1005Metric | R13 |
| 2 | 12k | R_0402_1005Metric | R16, R18 |
| 1 | 1 | R_0402_1005Metric | R19 |
RTB D20 design files
The KiCad project lives in the git4dcc/RTB_D20 repository on GitHub; these links point at the commit this page was built from.
- LayoutD20.kicad_pcb
- SchematicD20.kicad_sch
RTB D20: common questions
How big is the RTB D20 PCB?
The RTB D20 measures 14 × 8 mm, has 6 copper layers and is 0.8 mm thick.
How many components are on the RTB D20?
51 components, from 29 distinct parts. The full bill of materials is listed on this page.
Where can I download the RTB D20 design files?
From the git4dcc/RTB_D20 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the RTB D20 design in my own project?
Yes, under the terms of its Apache-2.0 license, which git4dcc chose for the repository.