4 layers133.4 × 44.3 mm
4 layers94.1 × 59.1 mm
SignalSlinger
OpenARDF/SignalSlinger7An Automated Radio Orienteering Transmitter
- Size
- 94.1 × 59.1 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 116
- Nets
- 81
- Pads
- 339
- Tracks, vias
- 1,416, 376
- Pours
- 19
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 Jun 2023
- Updated
- 25 Oct 2026
Overview
SignalSlinger is an open-source printed circuit board by OpenARDF, from the OpenARDF/SignalSlinger repository on GitHub, published under the MIT licence. It is a 4-layer board of 94.1 × 59.1 mm with 116 parts on 81 nets, routed with 1,416 tracks and 376 vias.
It is built around the AVR128DA28-E/SP, LM5134BMF and LP2985-33DBV, with the 1N914WT, BAT54C and BSS138W-7-F among its other parts. Its parts include 32 capacitors, 21 diodes, 14 resistors, 13 connectors and 10 ICs. It belongs with the radio and wireless boards of this library.
Main components
9
AVR128DA28-E/SP
SPDIP-28-40℃~+125℃ 1.8V~5.5V 10bit 128KB 12bit 16KB 23 24MHz 512Byte 8 Bit AVR Built-in FLASH SPDIP-28 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM5134BMF
SOT-23-6-40℃~+125℃ 1 2ns 3ns 4.5A 4V~12.6V 7.6A 800uA Low Side MOSFET Under Voltage Protection SOT-23-6 Gate Drivers ROHSTexas InstrumentsGate Drivers
LP2985-33DBV
SOT-23-5-40℃~+125℃@(Tj) 1 150mA 16V 3.3V 30uVrms 45dB@(1kHz) 575mV@(150mA) 850uA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control、Noise bypass terminal Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
1N914WT
SOD-523100V 150mW 1V@10mA 200mA 4ns 5uA@75V Independent SOD-523 Switching Diodes ROHSCBISwitching Diodes
BAT54C
SOT-231 Pair Common Cathode 200mA 2uA@25V 30V 600mA 800mV@100mA SOT-23 Schottky Diodes ROHSNexperiaSchottky DiodesBSS138W-7-F
UncategorisedUnknown maker
ECS-327TXO-30-TR
SMD3225-4P-40℃~+85℃ 1.25uA 32.768kHz 3V CMOS ±5ppm SMD3225-4P Temperature Compensated Crystal Oscillators (TCXO) ROHSECSTemperature Compensated Crystal Oscillators (TCXO)
IRF610
TO-220AB-55℃~+150℃ 1 N-channel 1.5Ω@10V 135pF 16pF 200V 3.3A 43W 4V 60pF 8.2nC@10V N-Channel TO-220AB MOSFETsTexas InstrumentsMOSFETs
NTS4173PT1G-VB
SOT-323(SC-70)MOSFETsVBsemi Elec
README
README.mdSignalSlinger
SignalSlinger is an open-source 80-meter radio orienteering (ARDF) transmitter kit for the 3.5 MHz to 3.7 MHz amateur band. It supports classic, sprint, and foxoring events, with a high-accuracy real-time clock for synchronized transmissions and scheduled start and finish times.
Product Photo
Documentation
Availability
SignalSlinger is available in kit form from Backwoods Orienteering Klub. Order the SignalSlinger Transmitter Kit or visit the product page for current pricing, availability, shipping information, and kit details.
Updating Software
This main branch corresponds to the current stable firmware release. Download the update file that matches your hardware revision:
SignalSlinger-Update-v2.1.0-HW-3.5.hexSignalSlinger-Update-v2.1.0-HW-3.4.hex
Use SerialSlinger for normal updates on devices that already support software updates. For first-time bootloader setup, use the matching complete release bundle and an approved programmer over the board's UPDI programming header (P101). Always choose the file that matches your hardware revision, and do not modify fuses or disable UPDI outside the documented setup flow.
For complete programming steps, setup-bundle usage, and hardware connection details, see the User Manual. If you want current firmware and software development instead of the stable public release, use Development1. KiCad schematic, PCB, library, simulation, and model work is collected separately on Development1-KiCad. main remains linear, while collector pull requests use merge commits so topic and synchronized main ancestry are preserved; after a promotion, verify each focused synchronization topic with just collector-sync-check <collector>.
Firmware Development
Firmware source and build scripts live in Software/AVR128DA28.
For the current development workflow, start here:
Software/AVR128DA28/CODEX_WORKFLOW.mdfor branch and patch-verification expectationsSoftware/AVR128DA28/RELEASE_WORKFLOW.mdfor release preparation and dual-target asset checksSoftware/AVR128DA28/build-firmware.ps1for the standard local firmware buildSoftware/AVR128DA28/verify-firmware-hashes.ps1for dual-target.hexbuild and SHA256 verification
Related Projects
- SignalStreamer, a matching antenna
- SignalSnagger, a companion receiver project
- SerialSlinger, a serial terminal and logging companion for SignalSlinger configuration and monitoring
Parts
116| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10uF | Capacitor_SMD:C_0805_2012Metric | C109, C201, C203, C205, C206, C207, C208, C210, C216, C299 |
| 8 | 470nF | Capacitor_SMD:C_0805_2012Metric | C102, C103, C106, C108, C112, C204, C217, C301 |
| 7 | ESD9B5.0ST5G_1 | Diode_SMD:D_0603_1608Metric | D105, D106, D108, D109, D110, D111, D112 |
| 6 | Schottky Diode | Diode_SMD:D_SOD-123FL | D107, D115, D203, D204, D206, D207 |
| 5 | 100nF | Capacitor_SMD:C_0805_2012Metric | C101, C104, C105, C107, C218 |
| 4 | Conn_01x02 | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J101, J103, J104, J106 |
| 3 | 162k | Resistor_SMD:R_0805_2012Metric | R102, R110, R204 |
| 3 | TPS22810DBVT | Package_TO_SOT_SMD:SOT-23-6 | U103, U204, U206 |
| 2 | 10k | Capacitor_SMD:C_0805_2012Metric | R107, R108 |
| 2 | 10nF | Capacitor_SMD:C_0805_2012Metric | C202, C209 |
| 2 | 1100pF | Capacitor_SMD:C_0805_2012Metric | C302, C305 |
| 2 | 12.4k | Resistor_SMD:R_0805_2012Metric | R103, R205 |
| 2 | 1N4001 | Diode_SMD:D_SOD-123F | D208, D209 |
| 2 | 1N914WT | Diode_SMD:D_SOD-523 | D101, D102 |
| 2 | 47uF low ESR | Capacitor_Tantalum_SMD:C_2917 | C111, C215 |
| 2 | LP2985-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U201, U202 |
| 2 | TBD | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R1, R2 |
| 1 | 105k | Resistor_SMD:R_0805_2012Metric | R101 |
| 1 | 1800pF | Capacitor_SMD:C_0805_2012Metric | C303 |
| 1 | 1k | Resistor_SMD:R_0805_2012Metric | R104 |
| 1 | 2.2uH | Inductor_SMD:WPN4020H2R2MT | L201 |
| 1 | 2.6A | Fuse:Fuse_1812_4532Metric | F201 |
| 1 | 2.7uH | Inductors:Toroid_T-60_2TH_Vertical | L301 |
| 1 | 2.7uH | Inductor_THT:Toroid_T-60_2TH_Vertical2 | L302 |
| 1 | 220 | Resistor_SMD:R_0805_2012Metric | R105 |
| 1 | 22uF | Capacitor_SMD:C_1210_3225Metric | C110 |
| 1 | 25 MHz | Crystal:Crystal_SMD_TXETCLSANF-4Pin | X102 |
| 1 | 47 0.5W | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P2.54mm_Vertical | R109 |
| 1 | 47k | Resistor_SMD:R_0805_2012Metric | R106 |
| 1 | 91pF | Capacitor_SMD:C_0805_2012Metric | C304 |
| 1 | 9T #24 Bifilar T50-43 | Inductors:Toroid_T-50A_TH_BF_CT_Vertical | L101 |
| 1 | AVR128DA28 | Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm | U101 |
| 1 | AdaFruit Charger | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | MOD201 |
| 1 | B330A Schottky Diode | Diode_SMD:D_SMB | D202 |
| 1 | BAT54C | Package_TO_SOT_SMD:SC-59 | D201 |
| 1 | BSS138W-7-F | Package_TO_SOT_SMD:SOT-323_SC-70 | Q102 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_CUI_PJ-036AH-SMT_Horizontal | J201 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J102 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J105 |
| 1 | Controlled Bat Pwr | TerminalBlock_4Ucon:TerminalBlock_4Ucon_1x02_P3.50mm_Horizontal | J205 |
| 1 | Controlled Fan Power | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J204 |
| 1 | DB9 Female | Connector_Dsub:DSUB-9_Female_EdgeMount_P2.77mm | J107 |
| 1 | ECS-327TXO-30-TR | Oscillator:Oscillator_SMD_ECS_327TXO | X101 |
| 1 | Ext-to-Boost | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP203 |
| 1 | Ext-to-Linear | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP202 |
| 1 | External Fan Power | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J203 |
| 1 | Green LED | LED_SMD:LED_0805_2012Metric | D104 |
| 1 | I2C1 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | TP101 |
| 1 | IRF610 | TO_SOT_Packages:TO-220_Neutral123_Vertical_LargePads | Q103 |
| 1 | ISP/PDI | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical_SMD | P101 |
| 1 | Internal_V_Enable | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP204 |
| 1 | Jumper_2_Bridged | Jumper:Jumper_THT_1x02_P1.27mm_Vertical | JP102 |
| 1 | Jumper_3_Bridged12 | Jumper:Jumper_THT_1x03_Bridged12_P1.27mm_Vertical | JP101 |
| 1 | LM5134 | Package_TO_SOT_SMD:SOT-23-6-LM5134 | U104 |
| 1 | NTS4173PT1G | Package_TO_SOT_SMD:SOT-323_SC-70 | Q101 |
| 1 | Red LED | LED_SMD:LED_0805_2012Metric | D103 |
| 1 | SI5351 | Package_SO:MSOP-10_3x3mm_P0.5mm | U102 |
| 1 | SW_SPST | Button_Switch_SMD:SW_SPST_TL1014BF160QG | SW101 |
| 1 | T2 | Measurement:Measurement_Point_ScopeProbe_Round-SMD-2sides-Pad_Small | W101 |
| 1 | TO-220 ADJ Reg. | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U203 |
| 1 | To Antenna | Connector_Coaxial:BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J301 |
| 1 | V-ext disable | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP201 |
| 1 | uA7805 | Package_TO_SOT_SMD:SOT-223-4 | U205 |
The 110 most common of 116 parts.
Questions
How big is the SignalSlinger PCB?
It measures 94.1 × 59.1 mm and has 4 copper layers, 1.61 mm thick.
What parts does the SignalSlinger use?
116 parts, built around the AVR128DA28-E/SP, LM5134BMF, LP2985-33DBV and 1N914WT. 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 SignalSlinger KiCad files?
From the OpenARDF/SignalSlinger repository on GitHub, at the commit this page was made from: the board is KiCad/SignalSlinger/SignalSlinger.kicad_pcb and its schematic KiCad/SignalSlinger/Misc.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SignalSlinger design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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