2 layers24.7 × 39.8 mm
2 layers25.4 × 48.9 mm
Sequencer3
glenoverby/SequencerAn Arduino sequencer for amateur radio
- Size
- 25.4 × 48.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 37
- Pads
- 88
- Tracks, vias
- 72, 3
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 20 Oct 2026
- Updated
- 20 Oct 2026
Overview
Sequencer3 is an open-source printed circuit board by glenoverby, from the glenoverby/Sequencer repository on GitHub. It is a 2-layer board of 25.4 × 48.9 mm with 21 parts on 37 nets, routed with 72 tracks and 3 vias.
It is built around the VP3203N3-G, MMBT2222 and MMBT2222A. Its parts include 8 transistors, 5 connectors, 4 resistors and 1 diode. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3VP3203N3-G
TO-92-3-55℃~+150℃ 1 P-Channel 300pF 30V 4A 600mΩ@10V 60pF 740mW TO-92-3 MOSFETs ROHSMicrochip TechnologyMOSFETs
MMBT2222
SOT-231 NPN 1uA 300mV 300mW 400 40V 600mA 6V NPN SOT-23 Bipolar (BJT) ROHSYONGYUTAIBipolar (BJT)MMBT2222A
SOT-23-55℃~+150℃ 1 NPN 100 100nA 1V 300MHz 300mW 40V 600mA 6V NPN Standalone SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)
README
README.mdSequencer
An Arduino sequencer for amateur radio
This is an Arduino project used for sequencing transmit / receive relays, amplifiers and transverters in order to prevent transmitting into a relay when it is switching, and to protect recevier inputs from transmitters or amplifiers.
I've written a full description of othe project.
The source code is in this repository under Software and the KiCad files for a PCB are under Hardware/sequencer3. I had this board manufactured by OshPark in 2024.
Arduino Clone (sort of)
I wanted to reduce the cost of this project, and the MegaAVR chip itself is about a tenth of the price of an Arduino board. I can get by with just the AVR and a few support chips. I made an arduino style board for the ATMega328 in a TQFP package.
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | VN2222A | Package_TO_SOT_THT:TO-92_Inline | Q1, Q3, Q4, Q5 |
| 3 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4, PTT1, PWR1 |
| 2 | 10K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | 5.1K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2 |
| 2 | VP3203 | Package_TO_SOT_THT:TO-92_Inline | Q2, Q6 |
| 1 | ARDUINO_PRO_MINI | SparkFun-Boards:ARDUINO_PRO_MINI | B1 |
| 1 | Conn_01x04_Male | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J2 |
| 1 | Conn_01x08_Male | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J1 |
| 1 | D_Zener | Diode_THT:D_DO-34_SOD68_P5.08mm_Vertical_KathodeUp | D1 |
| 1 | MMBT2222 | Package_TO_SOT_SMD:SOT-23 | Q7 |
| 1 | MMBT2222A | Package_TO_SOT_SMD:SOT-23 | Q8 |
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Questions
How big is the Sequencer3 PCB?
It measures 25.4 × 48.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Sequencer3 use?
21 parts, built around the VP3203N3-G, MMBT2222 and MMBT2222A. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Sequencer3 KiCad files?
From the glenoverby/Sequencer repository on GitHub, at the commit this page was made from: the board is Hardware/sequencer3/sequencer3.kicad_pcb and its schematic Hardware/Mega328basic1/Mega328basic1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sequencer3 design in my own project?
Its repository states no licence, so its author keeps all rights: ask glenoverby before reusing the design.