HardLabs

RTB D98

git4dcc·RTB_D98

RTB D98 PCB layout, top view — open source AVR/Arduino board by git4dcc

About the RTB D98 PCB

RTB D98 is an open source AVR/Arduino PCB design by git4dcc, published on GitHub under the Apache-2.0 license. It is a 4-layer board measuring 12.7 × 8.8 mm, with 60 components from 22 distinct parts.

Its main chip is the AVR-64DA32, from the AVR/Arduino family. Other key parts include the NCP730BMT330TBG. By type, the board carries 20 connectors, 18 resistors, 7 transistors, 7 diodes, 6 capacitors and 2 ICs.

From the project

DCC / Railcom function decoder (10x AUX, 1x WS28xx)

Note: this repo is currently under construction and will be completed soon. (Feb 20, 2026)

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, Long1 - DYN: QoS, Track-voltage, AUX-current, Temp, East/West - double sided - Dimension: 13 x 9 mm - 5-20V track voltage - heartbeat LED - adjustable max AUX current (default 500mA) - over temp protection - Function output** - LV/LR/AUX1/AUX2 open drain - AUX3/AUX4/AUX5/AUX6/AUX7/AUX8 logic level (5V) -…

RTB D98, from the project README
From the project README

Main components on the RTB D98

NCP730BMT330TBGAVR-64DA32

RTB D98 bill of materials (BOM)

60 components, 22 distinct parts.

QtyPartRefs
1
NCP730BMT330TBG
NCP730BM
IC2
1
AVR-64DA32
U1
2
BC847BDW1
Q1, Q7
1
BC857BDW1
Q2
4
PMZB200UNEYL
Q3, Q4, Q5, Q6
18
pad
J1, J2, J3, J6, J7, J8, J9, J10 +10
1
Solder Pad
J14
1
NEM651
J15
1
LED
D1
6
SM5819L2-TP
D2, D3, D4, D5, D6, D7
4
22u/6V
C1, C5, C8, C9
2
10u/25V
C2, C4
2
33k
R1, R2
2
3.3k
R3, R15
1
33
R4
4
10k
R5, R6, R11, R12
2
220k
R7, R8
2
9.1k
R9, R10
2
22k
R13, R14
1
470
R16
Show 2 more
QtyPartRefs
1
1
R19
1
200
R21

RTB D98 design files

The KiCad project lives in the git4dcc/RTB_D98 repository on GitHub; these links point at the commit this page was built from.

RTB D98: common questions

What microcontroller does the RTB D98 use?

The RTB D98 is built around the AVR-64DA32, from the AVR/Arduino family.

How big is the RTB D98 PCB?

The RTB D98 measures 12.7 × 8.8 mm, has 4 copper layers and is 0.8 mm thick.

How many components are on the RTB D98?

60 components, from 22 distinct parts. The full bill of materials is listed on this page.

Where can I download the RTB D98 design files?

From the git4dcc/RTB_D98 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 D98 design in my own project?

Yes, under the terms of its Apache-2.0 license, which git4dcc chose for the repository.

Can I test firmware for the RTB D98 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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